Jim Watson
Member
The muzzle velocity of the 158 grain bullet load from 1925 is 858 feet per second. This from S&W's catalog of the time.
The muzzle velocity of today's 158 grain bullet load is 755 feet per second. This from the tables published in the Gun Digest.
Then there's the muzzle velocity of today's +P 158 grain bullet load some of the folks are cautioning you about using (also from the Gun Digest tables)----890 feet per second. I reckon you can see why they're concerned----or then again, maybe not.
But consider test conditions. I don't have anything from 1925 but in 1939 the standard velocity was 850 fps from a 6" barrel. Now was that a straight test barrel or a real revolver?
Nowadays, SAAMI authorizes both a 7.7" test barrel - which will get you all enthused if you load by Hodgdon - and a 4" vented barrel to simulate a revolver. Gun Digest is apparently going by the vented values.
For the common reload of a 158 gr lead bullet and 3.5 gr Bullseye, I find
Sharpe prewar 910 fps in 6" by Hercules. "factory lead"
Lyman #44 826 fps in 6" K38. #358311
Lyman #49 863 fps in 4" test. #358311
Alliant today 814 fps in 6" Speer swaged SWC.
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