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08-12-2014, 10:16 PM
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Velocity 158 grain 357 out of 8 3/8" barrel?
What MV do you see with this combination?
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08-12-2014, 10:35 PM
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The full original lead factory load was rated at 1510 fps. Current jacketed factory loads will be slower, but you can probably handload to duplicate it or nearly so.
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08-12-2014, 10:59 PM
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Quote:
Originally Posted by SLT223
Velocity 158 grain 357 out of 8 3/8" barrel?
What MV do you see with this combination?
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There are so many different 158gr .357 Magnum loads these days there is no way of knowing what the velocity would be unless you tell us which specific load you are using.
Winchester lists a velocity of 1250 fps for 2 of their 158gr loads but they don't tell us what barrel length.
Remington lists velocities of 1235 fps from 3 of their loads and that's from a 4" barrel.
Any reason why you need to know the velocity from an 8.375" barrel?
You could run them over a chrono to be sure because even if I had numbers from a 8.375" barrel your numbers would be different since your revolver will be different. shoot them from 10 revolvers and you will get 9 or 10 different velocities I'm sure.
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08-12-2014, 11:52 PM
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Quote:
Originally Posted by ArchAngelCD
You could run them over a chrono to be sure because even if I had numbers from a 8.375" barrel your numbers would be different since your revolver will be different. shoot them from 10 revolvers and you will get 9 or 10 different velocities I'm sure.
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I have found that the majority of people don't believe that but if they would use a chrono they would get an education. Larry
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08-13-2014, 12:00 AM
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It depends on the ammo. I had a 686 4" and clocked the Federal Hydra-Shok 158 gr 357 Magnum load at 1350 fps. Might pick up 100 fps in the 8.375".
If you want higher speeds, try the Buffalo Bore ammo.
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08-13-2014, 05:05 AM
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Quote:
Originally Posted by SLT223
What MV do you see with this combination?
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It's not what WE see, it's what YOU see! In the modern era, a chronograph is a "cheap" addition to the equipment of anyone seriously interested in how fast their slugs are moving.
Someone else's numbers are meaningless - ESPECIALLY with S&W revovlers because they tend to present with wide variation in barrel-cylinder gap which has a huge impact on resultant velocity!
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08-14-2014, 12:43 AM
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I just pulled out my notes.
Hornady Custom 158XTP 357 Magnum ammunition.
Measured velocity
(3) S&W 3 1/2" Model 27s
1219FPS
8" Colt Python
1383FPS
20" 1892 lever action
1744FPS
YMMV
FYI, from the model 27s those penetrated just over 15", expanded to .542 with 100% weight retention . .
Last edited by colt_saa; 08-14-2014 at 12:50 AM.
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08-14-2014, 06:13 AM
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Quote:
Originally Posted by colt_saa
I just pulled out my notes.
Hornady Custom 158XTP 357 Magnum ammunition.
Measured velocity
(3) S&W 3 1/2" Model 27s
1219FPS
8" Colt Python
1383FPS
20" 1892 lever action
1744FPS
YMMV
FYI, from the model 27s those penetrated just over 15", expanded to .542 with 100% weight retention . .
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Did the 3 M27s show 1219 FPS each or is that an average of the 3? Larry
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08-20-2014, 11:44 AM
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I have chrono-ed 1950's 357 magnum 158's that broke 1500 on a 24 shot string out of my 8 3/8" pre-27's.
When I reload for "Real 357 Magnum" loads, I shoot over the chrono and aim for 1500 to 1550. I don't want to see any individual round in a 24 shot string to go over 1550, but I would like the average to be right at 1500 if possible.
Modern big manufacture ammo will be much slower. 1300 to 1350 give or take.
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08-21-2014, 02:33 AM
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Quote:
Originally Posted by Peter M. Eick
I have chrono-ed 1950's 357 magnum 158's that broke 1500 on a 24 shot string out of my 8 3/8" pre-27's.
When I reload for "Real 357 Magnum" loads, I shoot over the chrono and aim for 1500 to 1550. I don't want to see any individual round in a 24 shot string to go over 1550, but I would like the average to be right at 1500 if possible.
Modern big manufacture ammo will be much slower. 1300 to 1350 give or take.
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What bullet was in the factory ammo?
Which bullet are you loading?
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08-22-2014, 09:41 AM
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158 grn lead SWC with luballoy
158 grn steel jacketed round nose (actual weight of 155 grns on a pulled bullet)
I load usually Lasercast 158's (155 actual weight) LSWC's when I want to go full power. MBC's work well also but Lasercast's are harder and seem to lead less.
The old comment that the original ammo will lead a barrel quickly is correct by the way.
Have fun working up to full power loads. I do all my development in a Ruger Redhawk 357 Magnum.
Here is a comparison of the Redhawk (stainless) to a S&W Pre-27 (blued). Note the extra steel in the cylinder. No reason to risk a collectible pre-27 when I can beat the tar out of the Redhawk with nearly no worries.
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09-05-2014, 04:55 AM
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There are so many different loads now it would vary quite a bit from a very low of 1250 from the light loads up to around 1800 with some of the Buffalo Bore stuff. Grain weight varies from 110 to 180 grain and bullets made from different materials will also determine performance.
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