Like the
acorn that eventually gives rise to the mighty oak, even the best ideas take a
little while to take root and grow to their full potential. They need the right
season, the right amount of rainfall, the right amount of warmth, the right
amount of time. Such was certainly the case with the ideas that spawned
this project.
Years ago, Gil Sengel wrote up an article about a couple of rifles he built that were chambered
for one of the oldest wildcat cartridges, the .25 Hornet. I first encountered
Gil’s write-up in the compilation “Wildcats” put out by Wolfe Press. Right after
that article is a piece by Al Miller on a similar wildcat he called the .257
Magnum, that was shortened slightly so as to fit in a S&W K-frame cylinder.
Well-thought out wildcat cartridges fascinate me. These .25 caliber rounds took
advantage of the selection of .25-20 bullets (both cast and jacketed) that were
of appropriate weight for the case capacity, the very nearly straight-case
design is ideally suited for use in revolvers, brass is easy to come by, and it
occupies a ballistic niche for which there are no commercially available
revolvers. Varmint hunting with revolvers is one of my favorite summer
pastimes. I wanted to put something like this into a revolver, but the thought
of cutting all those cases back tarnished the project’s appeal. The seed was
planted, but was as yet dormant.
It didn’t sprout and
take root for a while. Several years ago, Rob and Marilyn Applegate were about
to come up for a visit. Rob and I were talking on the phone, discussing his
K-frame 22 K-Hornet project and I mentioned that I’d had a few thoughts about
doing something similar in .25 caliber. “Oh yeah? You need a barrel?” It turned
out that he had a take-off barrel from a Ruger .25-06 that had been sitting in
his shop for years that he wanted to see get cut up (someone had drilled and
tapped it much too deep and it was unsafe to use in its current condition). It
even had the 1 in 10" twist that Gil Sengel had found worked best in his guns.
Spring rains were falling, the days were getting longer and warmer, and the seed
was about to sprout.
Rob delivered the barrel a few weeks later during their visit. Some quick
dimensions were taken and a chunk of barrel was extracted from the Ruger
take-off and turned to rough diameter. At this point the project sat idle for
several months. One day I walked into a pawn shop and stumbled across an OM .357
Blackhawk that was in pretty nice shape (but not quite collector grade). It had
a very friendly price-tag on it, and followed me home. Originally, I was going
to keep this .357 intact, as a shooter, but I soon found that even with the rear
sight bottomed out it wouldn’t shoot anything but the 125’s anywhere near point
of aim, and all the heavier bullets (that I favor) printed much higher. I
measured the OM Blackhawk’s cylinder, it was just exactly the right length to
house the full length .25 Hornet, with just enough room to spare. The Old
Model's fate was sealed.
Now that I had a
revolver and a barrel, it was time to get the ball rolling. I called Hamilton
Bowen (Bowen Classic Arms, Box 67 Louisville, TN 37777, (865) 984-3583,
www.bowenclassicarms.com,
bcacorp@nxs.net) and ordered one of his OM Ruger Blackhawk
cylinders with .218” pilot holes where the chambers should be (oh yeah, and
since this conversation was taking place about a month after his book "Custom
Handguns" came out, I ordered a copy). During our pleasant conversation I
learned that the cylinders were out of stock, but the next shipment was due in
shortly (that’s OK, that gave me plenty of time to ogle the spectacular
photography in his book until the cylinder arrived).
Next I called RCBS
(800-533-5000, www.rcbs.com, 605 Oro Dam Blvd., Oroville, CA 95965) to ask about
dies. Eventually, my call was routed back to the custom shop where I learned
that they do indeed make dies for the .25 Hornet, but they have two different
versions and they wanted to know who was making the reamer and wanted to see the
spec sheet to make sure that they made the right set for me. OK, put the dies on
hold for the moment….
There are several
possible sources of reamers for the .25 Hornet (JGS, Clymer, Pacific Precision,
etc.). To make my choice a little easier, I figured Rob Applegate, a man who has
made his living turning cherries and cutting moulds would know a thing or two
about reamers and reamer-makers, and so I sought his opinion. His response was
simple and to the point, “Dave Manson is a good man and he makes perfect
tools.” Anybody who knows Rob (aka “Persnickety”) and the exceptional of his
quality of work, knows that “perfect” is not a concept that he takes lightly. A
phone call to Dave Manson (Dave Manson Precision Reamers, 8200 Embury Road,
Grand Blanc, MI 48439, USA, Phone: 810-953-0732, Fax: 810-953-0735,
web address www.mansonreamers.com,
david@mansonreamers.com and I knew the choice was the right
one. He was very helpful in lining things out and telling me what he needed to
give me exactly the reamer that I wanted. He would even handle the arrangements
with RCBS to expedite production of the dies. Ever notice how so many people in
the shooting sports are just flat nice folks?
In the meantime, I
bought 500 R-P .22 Hornet cases, and ran 3 of them over a .256” expander ball.
These cases miked .2935” at the case head, and .2725” at the neck (no bullet
seated), and .274” with a Lyman 257420 (sized .2575”) seated in place. These
dimensions were e-mailed to Manson for reference in cutting the reamer, along
with the request for .003"-.0035" clearances on all chamber dimensions and a
.2575" throat. The reamer arrived a couple of months later. There were no
surprises, it was simply exactly what I had ordered in every detail. A few of
the pertinent dimensions include .297" at the case head, a .277" diameter neck
that is .400” long and a .2575" throat. Chambers were hand-cut in the Bowen
cylinder, and the Manson reamer cut smoothly and cleanly. The dummy rounds fit
the freshly cut chambers like a hand slips into a custom-tailored buckskin
glove. Perfect indeed.
The Bowen cylinder
was fit to the frame without any problems. The barrel was then threaded and cut
to fit the frame and cylinder. The fitting of the ejector rod housing and Bowen
front sight was performed (as a birthday present) by my good friend (and expert
pistol smith) Dave Ewer. The ejector rod was slimmed down until it would slide
into the skinny throats of the .25 Hornet cylinder and eject empties. The gun
was now ready to shoot.
The dies showed up a
couple of weeks after the reamer, or rather I should say 2 of them did. There
had been a mix up back at RCBS and the flaring die had somehow gotten
overlooked. A phone call and a follow-up e-mail corrected the situation and a
month or so later the flaring die showed up. After I started loading ammo for
this project, I discovered a minor problem with the sizer die. A phone call to
RCBS got me forwarded back to Stan in the custom shop. He told me to send in the
die in question with 5 fire-formed cases. A month later I had a new sizer die,
made to exactly match my chambers, and it works to perfection. Mistakes do
occasionally happen (we're all human), but the mark of a good business is borne
by how they make right on their mistakes. Thanks RCBS! That's good customer
service.
Fire-form loads were
assembled using the 85 grain cast FP from Western Bullet Co. (the Ideal 257283)
, loaded over 3.0 grains of Red Dot, sparked with a CCI 500 primer. Accuracy was
good with these light loads, and with formed cases in hand the loading project
was underway. Test loads were assembled using the Lyman 257420 GC-SWC over 10.0
grains of H110, a CCI 450 (small rifle magnum) primer, Hornady crimp-on
gas-checks and homemade moly lube (equal parts by weight beeswax and moly
grease). Initial tests with this ammo resulted in poor accuracy, with groups
running about 4" at 25 yards. Velocities averaged about 1530 fps, and varied
considerably. Point of impact was about 14-16" below point of aim, indicating
that the Bowen front sight needed to be cut down significantly. Further testing
revealed the groups were getting progressively smaller, finally settling in at
around an inch, so apparently the first groups were just a case of the gun
getting broken in, de-burring itself and conditioning the bore. It was unsettling
to note that the firing pin indents were off-center. The barrel and firing pin
appear to be lined up, suggesting that perhaps the cylinder might be slightly
out of alignment. However, a .250" range rod will go through the barrel and
into the throats without contacting the throats, so alignment is within
.0035". What's more there were no asymmetric lead deposits in the forcing cone
to indicate off-center entry of the bullet into the bore. The bottom line is
that the gun groups very well, and mechanically everything seems to be in order,
so I chose to ignore the off-center indents.
The gun was
stripped down, the front sight ground down to proper height and the face of the
front sight serrated. The metal was next prepared for bluing.
All surface prep
work and polishing was done by hand. Working up through the grits, it was taken
to a high polish with 600 grit SiC and then "softened" with #00 steel wool to
produce a satin finish. The gun was hot blued using a concentrated solution of
sodium hydroxide and potassium nitrate at 300°F
to produce a very satisfying deep satin black finish, similar in color to that
used by Ruger (don‘t try this at home unless you thoroughly understand the
hazards associated with handling these chemicals under these conditions, I‘m a
chemist by trade and took the appropriate precautions -- boiling lye is not
something to take lightly).
A little
reference data is appropriate at this point. P. O. Ackley reported
load data for the .25 Hornet in his Handbook for Shooters and Reloaders. His test arm was a
rifle, so his velocities are higher than can be expected from a 7 1/2" revolver.
Ackley reported the use of 11 grains of 2400 with a 60 grain bullet for 2035
fps, or 10 grains of 2400 with an 86 grain bullet for 1675 fps. In his piece on
the .25 Hornet, Gil Sengel reported that 9.0 grains of 2400 with 75 grain
bullets generated 2000 fps (once again, in a rifle), while 10.0 grains of 296
produced 2180 fps. A mild load of 4.0 grains of Unique with a 72 grain cast
bullet delivered very nice accuracy and 1475 fps. I was guessing that revolver
loads were going to run about 400 fps slower than these numbers. Time to start
working up loads.
Bullets were cast of
WW alloy, sweetened with 1-2% added tin, sized .2575" (to exactly match this
revolver's throats) and were lubed with my homemade moly lube (equal parts by
weight beeswax and moly grease). Bullets used included the Lyman 257420 GC-SWC
(70 grains), the 257420 GC-HP (also 70 grains, interestingly), the Lyman 25727
HP (83 grains), the Lyman 25720 (86 grains), the similar Winchester .25-20
Single-Shot bullet (86 grains), and the H&G #54 (88 grain GC-FP) and the H&G #32
(67 grain GC-FP). Since the primary reason for this revolver is for varmint
hunting, I was especially interested in finding good working loads for the cast
HP's (the 257420 HP and the 25727 HP). Initially, bullets were sized .2575" in a
worn (read “scratchy“) .257” sizer. Acceptable accuracy was obtained, but
nothing that really lived up to the capabilities of a hand-fitted
revolver. Using a new RCBS .258" sizer produced much better accuracy and was
used for all subsequent loading.
In general the GC
bullets seemed to shoot better than the plain-based bullets, which is not
surprising at these velocities and pressures. No leading with either GC or PB
bullets at these speeds, but the GC bullets did tend to produce smaller groups.
Most of the loads tried would put 5 shots into 1 1/2" to 2" at 25 yards. A load
was considered accurate if it would put 5 shots into less than 1 1/2", and very
accurate if they went into 1" or less.
While the slower
magnum pistol powders commonly turned in the higher velocities (no surprise
there), the best accuracy was generally turned in by HS-6 and HS-7. The slower
powders generally produced better accuracy with the heavier bullets (80
grains). As an interesting aside, this revolver tends to shoot different weight
bullets to the same point of impact. Presumably, this is due to the combination
of light recoil and high velocity.
As this is going to
be a revolver that I hunt with a lot in hot, sweaty weather, I decided to put
some Hogue imitation ivory (polymer) grips on it. I was pleasantly surprised
with how good these grips look on the gun. I took this revolver to our annual
Pacific Northwest Sixgunner Rendezvous and it was a big hit with the other
shooters. They really liked the combination of high velocity and low recoil.
Some preliminary
field results with cast bullets on rodents: the 257420 at 1550 fps proved itself
to be a flat-shooting ground squirrel load that smacked the little rodents with
authority on well-centered hits, but left a little to be desired with hits
“around the edges”. The HP version of this little GC-ed bullet was likewise
tested and found to be just as flat-shooting, but notably more effective at
anchoring rodents upon impact, with any kind of hit. This dainty little HP is
not as explosive as the Keith HP (the Lyman 358439), but it expands readily and
does a fine job in the field. The .25 Hornet should be adequate for critters up
to about coyotes in size. When I’m handling this gun, I just can’t seem to keep
thoughts of Javelina out of my brain!
This has been a fun,
and educational, project. While I don’t expect that there’s a huge market demand
for revolvers chambered for the .25 Hornet cartridge, it does occupy a unique,
and useful niche, and one that some handgun hunters will likely appreciate. It’s
easy to load, easy to shoot and exceptionally accurate. It should also be right
at home in the Contender. Excuse me while I go load some more ammo...
Loading data for the .25 Hornet
for the OM Blackhawk |
Fire formed R-P cases |
|
CCI small pistol magnum primers (unless
otherwise noted) |
|
Velocities are from a 7 1/2” Ruger
Blackhawk |
|
|
Lyman 257420 GC-FP (70 grains) |
Lyman 257420 GC-HP (70 grains) |
Powder |
Charge |
Velocity |
Comments |
|
Powder |
Charge |
Velocity |
Comments |
HS-6 |
6.0 gr. |
1524 |
accurate |
|
HS-6 |
6.0
gr. |
1546 fps |
most accurate load tested |
HS-7 |
7.0
gr. |
1503 |
very accurate |
|
HS-7 |
7.0
gr. |
1568
fps |
excellent! |
AA # 9 |
8.2
gr. |
1569 |
accurate |
|
AA # 7 |
7.0
gr. |
about 1600 |
shows promise |
H110 |
10.0
gr. |
1530 |
reduce 1/2 grain |
|
AA # 9 |
8.5 gr. |
1732
fps |
poor-vertical string |
|
|
|
|
|
2400 |
8.5 gr. |
1754
fps |
poor-vertical string |
|
|
|
|
|
H110 |
9.5
gr. |
1822
fps |
poor-vertical string |
|
|
|
|
|
|
|
|
|
Lyman 25727 PB-HP (83 grains) |
|
Lyman 257283 PB-FP (85 grains this
bullet is available from Western Bullet Co.) |
Powder |
Charge |
Velocity |
Comments |
|
Powder |
Charge |
Velocity |
Comments |
HS-7 |
6.5
gr. |
1511
fps |
reduce 1/2
grain |
|
HS-6 |
5.4
gr. |
1586
fps |
accurate |
AA # 7 |
6.4
gr. |
1519
fps |
|
|
HS-7 |
6.1
gr. |
1424
fps |
accurate |
AA # 9 |
8.1
gr. |
1412
fps |
|
|
AA # 7 |
6.0
gr. |
1490
fps |
shows promise |
2400 |
8.0
gr. |
1420
fps |
so-so |
|
|
|
|
|
|
H110 |
9.0
gr. |
1525
fps |
poor |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Ideal 257464 Loverin GC-HP (87 grains) |
|
Hensley and Gibbs #54 GC (88 grains) |
Powder |
Charge |
Velocity |
Comments |
|
Powder |
Charge |
Velocity |
Comments |
HS-6 |
5.1
gr. |
1264
fps |
shows promise |
|
HS-6 |
5.0
gr. |
1392
fps |
|
AA # 7 |
5.7
gr. |
1290
fps |
very accurate |
|
HS-7 |
5.9
gr. |
1454
fps |
|
AA # 9 |
7.5
gr. |
1402
fps |
|
|
AA # 7 |
6.0
gr. |
1348
fps |
vertical stringing |
2400 |
7.5
gr. |
1352
fps |
shows promise |
|
AA # 9 |
7.7
gr. |
1425
fps |
accurate |
|
H110 |
8.5
gr. |
1355
fps |
|
|
2400 |
7.0
gr. |
1321
fps |
accurate |
|
|
|
|
|
|
H110 |
8.5
gr. |
1455
fps |
poor |
|
|