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/...As some here might already know, I am a huge Buffalo Bore fan and that is my daily carry load (158 grain HEAVY +P LSWCHP-GC - 1040 fps from a 2" bbl. and 1170 fps from a 6" barrel). Now, as some may know, Remington recently re-branded their "FBI load" and their long time designation of R38S12 is now known as High Terminal Performance or HTP.../
.../OLD R38S12 158 GRAIN +P LSWCHP FBI LOAD FROM 6" M27
LOW: 953
HIGH: 969
AVG: 964
NEW HTP 158 GRAIN +P LSWCHP FBI LOAD FROM 6" M27
LOW: 859
HIGH: 884
AVG: 872
Several comments on various issues that have popped up in the thread:
1. All the commercial ".38 Special FBI" loads, past and present are limited to the SAAMI .38 Special +P pressure spec adopted in 1974.
There are indeed +P loads that are marketed or viewed as being the FBI load, but the original 1972 FBI load exceeds the SAAMI maximum pressure spec for "+P" ammunition. Meaning the original FBI load would be what we'd call a "+P+" load running in the neighborhood of 23,000 psi to generate between 1014 fps and 1090 fps (depending on whose original data you read) in a 4" barrel.
Given that, I've never understood why people swore by the "old" Remington FBI load, given that it wasn't even close.
2. The OP compared the old Remington load with the new recognition load, but even the old Remington load in a 6" barrel is at least 50 fps short of the old load in a 4" barrel (1014 to 1090 fps versus 964 fps).
Obviously with a velocity of only 872 fps, the "new" Remington load falls even farther behind.
3. There are comments to the effect that reports of harder lead are anecdotal. As noted above, unless the bullet is soft lead, you'll get penetration but not expansion. I wouldn't worry about anecdotal evidence - he simple fact is that if you can't easily dent the bullet with a fingernail it's way too hard to reliably expand at the velocities in question.
4. Buffalo Bore's Heavy .38 Special "+P" ammo exceeds the old FBI load in terms of velocity. They indicate the following on their site:
S&W mod. 60, 2 inch- 1040 fps (379 ft. lbs.)
S&W mod. 66, 2.5 inch- 1059 fps (393 ft. lbs.)
Ruger SP101, 3 inch- 1143 fps (458 ft. lbs.)
S&W Mt. Gun, 4 inch- 1162 fps (474 ft. lbs.)
You'll note all of the above revolvers are models designed for .357 magnum loads.
It's still soft lead, and they use a gas check to control leading.
If you're looking for something that is at least equal to the old 1972 law enforcement only FBI load, BB's Heavy .38 Special is the only game in town.
5. The .357 Magnum, when loaded with slow burning powders for longer barrels is not all that efficient in a 2" barrel. You'll get lots of muzzle flash, lots of muzzle blast and lots of unburnt powder in your face, but you won't get an awful lot of velocity, particularly with the lighter 125-130 grain bullets often used in 2" revolvers.
I've found however that with a powder like Unique I can get 1250 fps in a 2" barrel with a 125 grain XTP. That's about 150 fps over a .38 Special +P load and worth the effort with minimal increase in muzzle flash. It also recoils a lot less than a load with ice the weight of slow burning powder, give that the exit velocity of the propellant gas is about 3 times the velocity of the projectile, and it adds significantly to the recoil even at the same projectile velocity.