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Fast twist barrels - 45bpcr - 11-05-2015
Hello all,
Are there any thoughts on fast twist barrels and bullet over stabilization at cast lead bullet - black powder velocities?
The reason I ask is my wife's 38-55 C-Sharps wears a 1-12 twist 28" Green Mountain barrel. She does pretty good on her lay down animals shooting a 365 grain BACO Creedmoor powered by 41 grains of Swiss 1 1/2F.
Chickens are another story. (Aren't they all )
I have a Lyman 2 cavity 375248 that I use for my 375 Winchester 94 and was thinking of using it to make a High Speed / Low Recoil chicken load. These bullets are .945 long as opposed to 1.41 for the Creedmoor.
Thanks,
Craig
RE: Fast twist barrels - Mike - 11-05-2015
Craig, I also have a .375 Win. (in a Marlin) and the bullet I use is Lyman's #375296, just a bit heavier and with a gas check. That was still designed for the .38/55, to make high power loads. While the old .38/55s did have slower twists, go ahead and try those chicken loads with #375248. There's no reason that it shouldn't work. Shoot sharp, Mike
RE: Fast twist barrels - bruce moulds - 11-05-2015
craig try it for sure.
contrary to urban myth, there is no such thing as overstabilization.
all that will happen is that the yaw of repose will be a little nose higher than with a slower twist.
this will induce a little more drag, but will be unnoticeable to the shooter.
the bullet will be highly resistant to wind shear.
keep safe,
bruce.
RE: Fast twist barrels - 45bpcr - 11-05-2015
I'm going to give it a shot this weekend.
Loaded 40 rounds with charge weights from 43 to 51 grains of Swiss 3f in 2 grain increments.
43 grains is no compression and 51 grains is about 2/10ths with a .060 vegi wad.
I can seat that little bullet out with the first driving band exposed, which puts the bullet into the lands.
I figure I need to get up to my home range anyways and shoot up a bunch of 38-55 and 40-65 left over from the season to get my brass back, so whats 40 more.
Anyone want to head up to NH to give me a hand?
I'll cook ya a lobsta, red meat and beer :-)
Craig
RE: Fast twist barrels - Mike - 11-05-2015
(11-05-2015, 06:51 PM)45bpcr Wrote: I'm going to give it a shot this weekend.Craig, I'd love to come but that's a bit far from the Pacific Ocean. Shoot sharp, Mike
Loaded 40 rounds with charge weights from 43 to 51 grains of Swiss 3f in 2 grain increments.
43 grains is no compression and 51 grains is about 2/10ths with a .060 vegi wad.
I can seat that little bullet out with the first driving band exposed, which puts the bullet into the lands.
I figure I need to get up to my home range anyways and shoot up a bunch of 38-55 and 40-65 left over from the season to get my brass back, so whats 40 more.
Anyone want to head up to NH to give me a hand?
I'll cook ya a lobsta, red meat and beer :-)
Craig
RE: Fast twist barrels - Hiwall55 - 11-05-2015
Craig try the postell in 38, 335 grain I shoot it in 10,12 and 13.25 twist 38s. Lyman mould but don't know the number. Bill
RE: Fast twist barrels - Nuclearcricket - 11-05-2015
Another bullet you might want to look into is the tapered Hoch that CPA sells. It runs about 300 gr or so. I haven't shot it much but what little I did play around with it , showed potential. About 41 gr of Ctg under the bullet and recoil was very mild and I went 10 for 10 on the pigs. Now I will admit that I was all over the pig and was only shooting on the swinger but it went bang and clang each time. The rifle was a CPA with a 15 twist Badger barrel. I feel that a little load development and it would make a good chicken and pig bullet and leave the heaver ones for the turkeys and rams.
Sam
RE: Fast twist barrels - Ironramrod - 11-05-2015
Craig,
That Lobsta, red meat and beer offer to shoot surplus rounds sounds really good, but it's a long way from central ND to NH. Besides it's the opening weekend of deer gun season around here, and I got a .45/110 that's chompin' at the bit to make an honest living besides shootin' jackrabbits out of the pickup window.
I certainly don't want to see a grown rifle start cryin'
.Regards,
IR
RE: Fast twist barrels - 45bpcr - 11-08-2015
Lobsta is less then beef per pound here, had a couple of good ones on the coast yesterday and in theory, my Darling wife picked some up at the store today.
So I shot those little bullets today. Carolyns rifle is hard for me to shoot as it has a 12 inch LOP. I put an extended recoil pad on it but I'm still all skrunched up behind it.
The 43 grain loads were a waste of powder and lead. 8 inch group at 200 yards. Groups shrunk as the powder charge increased. The 51 grain load hovered around 2 inches.
Her normal load with the heavier bullet goes into less than two inches at the same range.
So I might soften up the alloy to 20-1 and up the powder charge and see what happens, 'cause "everyone" knows, you can't compress Swiss.
I burned 87 rounds down range skrunched up behind her rifle.
I shot alot more through the 40-65, just burning up ammo.
It was a typical day at Sunset Mountain.
Wind was a fishtail headwind running around 15 mph.
Deer were running across the 200 yard line, sometimes you need to put one in the dirt behind them to make them move.
I painted our one ram when I got there and turned him silver with lead. Did that a few times before I got tired.
Thanks Don for having this place to write and share.
Craig
RE: Fast twist barrels - Don McDowell - 11-08-2015
Craig glad to have you.