Bob, I do not have Quickload and have not attempted a similar theoretical work up.....but I have pushed 158grain bullets out of a 2 inch snub at over 800fps (chronographed) with loads that pressure tested (book) at 16000 CUP. This makes me wonder if your calculations might be based upon a theoretical barrel length that is improperly short...to whit-Did your formula add the 1.5 inches of chamber/cylinder to the nominal lengths?
.38 Snub load
- Thread starter Jitterbug
- Start date
I'm hoping to get out this morning to "test" a couple of 158 SWC start loads with Titegroup and AA#5. And burn up some 125-130 grain FMJ factory loads for practice and brass while I'm at it.
I figure the factory FMJ's might give me some idea of how a "warm" 125-135 gr. load might feel.
I found some "older" Sierra 125 JHP's I had lying around on the shelves and I've decided to warm up the 125's and the 158 SWC and do comparisons as to which suits me and the gun best, this was after I just purchased a box of 125 XTP's.
Got a week off coming up so it will take me a month or so to get a chrono and something worked up, in the meantime I'm carrying with some 125 Nyclads and Federal 129+P Hydroshocks.
I might see if I can pick up a box of the Remington 158 factory load when I place my next order.
I figure the factory FMJ's might give me some idea of how a "warm" 125-135 gr. load might feel.
I found some "older" Sierra 125 JHP's I had lying around on the shelves and I've decided to warm up the 125's and the 158 SWC and do comparisons as to which suits me and the gun best, this was after I just purchased a box of 125 XTP's.
Got a week off coming up so it will take me a month or so to get a chrono and something worked up, in the meantime I'm carrying with some 125 Nyclads and Federal 129+P Hydroshocks.
I might see if I can pick up a box of the Remington 158 factory load when I place my next order.
BobR1
Member
Treeman
I had not given that any thought at all. On a revolver the cylinder length and barrel length should add together for a total barrel length. Rim to Muzzle as with a semiautomatic barrel, or a rifle barrel. Adding another 1.5 inches for the cylinder to the calculation would help the velocity a great deal, if adding another 1/2" to a 2" barrel calculation added 100 fps.
Thank you for pointing that out to me.
I just reran the 158 swc loads using 3.5 Inches as the barrel length. This jumped the velocity from just over 600 fps to around 850 fps average. Much better numbers. The calculation has no way to account for the cylinder to barrel jump velocity loss. I would guess this might loose a few additional FPS.
Thank you again.
Bob
I had not given that any thought at all. On a revolver the cylinder length and barrel length should add together for a total barrel length. Rim to Muzzle as with a semiautomatic barrel, or a rifle barrel. Adding another 1.5 inches for the cylinder to the calculation would help the velocity a great deal, if adding another 1/2" to a 2" barrel calculation added 100 fps.
Thank you for pointing that out to me.
I just reran the 158 swc loads using 3.5 Inches as the barrel length. This jumped the velocity from just over 600 fps to around 850 fps average. Much better numbers. The calculation has no way to account for the cylinder to barrel jump velocity loss. I would guess this might loose a few additional FPS.
Thank you again.
Bob
ArchAngelCD
Moderator, SWCA Member, Absent Comrade
I think you are going to like the results you achieve using AA#5. It's in the correct burn rate range to produce good velocity without pushing the SAAMI pressure limits too much. I have used AA#5 and HS-6 successfully with lead bullets and Longshot with jacketed bullets. Longshot and lead bullets don't play well together in the .38 Special, .38 Special +P and .357 Magnum for some reason.
I ran about 50 rounds of minimum charge weights of AA5 and Titegroup, the TG seemed to recoil less and grouped much better then the AA5 with this particular bullet a Denver Bullet 158 SWC.
Velocity should be about the same with both start loads IIRC???
Also ran 20 rounds of factory Lawman 125 gr. FMJ's. Recoil was about the same as the TG load if not a bit more snappy.
Next project is to warm up the 158's with TG and load up some 125's I have...
Velocity should be about the same with both start loads IIRC???
Also ran 20 rounds of factory Lawman 125 gr. FMJ's. Recoil was about the same as the TG load if not a bit more snappy.
Next project is to warm up the 158's with TG and load up some 125's I have...
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