jac714 wrote:I have a theory that you don't gain much over a .38 +p with a .357 mag in a short barrel, I plan on getting a volunteer with a .357 j-frame and shoot both .357 and .38 out of it over a chrono and see what is gained.
I would think the slower magnum powders used in the ,357 don't have time to build up the additional pressure. It should be an interesting experiment.
Looking at the Speer web site, their data backs your theory. You only gain a little with .357 Mag out of a 2" barrel.
135 gr hp bullet, shot from a 2"barrel -.38 Spc +P at muzzle = 860 fps/222 ft lbs energy
.357 Mag at muzzle = 990 fps/294 ft lbs energy
Does 72 foot pounds of energy make an appreciable difference?
Adding two inches to the barrel allows the Mag to show its stuff.
125 gr hp bullet, shot from a 4" barrel -.38 Spc +P at muzzle = 945 fps/248 ft lbs energy
.357 Mag at muzzle = 1450 fps/584 ft lbs energy
Back to the subject of recoil. In buying a snubbie I went with a steel frame .357 (S&W 640). I like the versatility of shooting 357 or 38. I also use the gun with new self-defense shooters. It's nice to have a heavier gun shooting .38s for the newbie.