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T. O'Heir · January 8, 2020, 01:45 PM

"...1350-1450 FPS out of 3 and 4 inch barrels..." Federal says their JHP .357 AE runs at 1240 FPS MV out of a 4" barrel. It's not going to be 1350-1450 FPS. Typical 158 jacketed bullets run a lot slower than 1350-1450 FPS out of 3 or 4 inch barrels. Tested by BBTI with Federal 158 grain Hydra-Shok at 1122 FPS for a 3" and 1332 FPS of of a 4".
http://www.ballisticsbytheinch.com/357mag.html
Fioochi 125's run at 1,450 FPS though. Look at the head stamp.
Mind you, any 158 or 125 grain .357 will seem "hot" in a 3" revolver weighing 27 oz.
Excess velocity doesn't explain a bulge anyway. You need to look closely at the cylinders for damage. Or possibly(probably more likely and preferable) a bit of crud got into the cylinder.

January 8, 2020, 01:45 PM	#9
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	"...1350-1450 FPS out of 3 and 4 inch barrels..." Federal says their JHP .357 AE runs at 1240 FPS MV out of a 4" barrel. It's not going to be 1350-1450 FPS. Typical 158 jacketed bullets run a lot slower than 1350-1450 FPS out of 3 or 4 inch barrels. Tested by BBTI with Federal 158 grain Hydra-Shok at 1122 FPS for a 3" and 1332 FPS of of a 4". http://www.ballisticsbytheinch.com/357mag.html Fioochi 125's run at 1,450 FPS though. Look at the head stamp. Mind you, any 158 or 125 grain .357 will seem "hot" in a 3" revolver weighing 27 oz. Excess velocity doesn't explain a bulge anyway. You need to look closely at the cylinders for damage. Or possibly(probably more likely and preferable) a bit of crud got into the cylinder. __________________ Spelling and grammar count!