Heya

Got a question for those who use a chronograph regularly, regarding velocity differences in .357/.38 revolvers with 4" and 6" barrels.

Using the same loads, shot out of a 4" gun and a 6" gun, what would be a general, rough estimation of velocity gain from 4" to 6" in velocity per inch, in your experience?

I would guess that different powders will react much differently than others in this regard, and different guns will shoot loads differently from other guns as well, but maybe some generalities?

Thanks

In general the gain with a 6" over a 4" barrel will increase as the
velocity of the load itself increases. A light 38spl plinking load may
only gain 25fps or so while a full power 357 load using a slow burning
powder may increase by 100 fps.

Go here. It is on the bottom of post #2. It is for a 44 mag but the percentages may also average out for a 357. But as mentioned, powder and bullet weight and even altitude and humidity could play a role. Not sure about Moon phase though If I were to guess, I agree with alwslate, about 100 fps all other things being equal.

FAQ's

__________________
Still Running Against the Wind

Yep, 100 to 110fps is what I've seen also with full power loads when I was paying attention to this.

I was curious about the lighter loads, but it makes sense that they would be less.. but how much..

I was trying to interpolate some load data that was shot with a 6" barrel and guessing what could be expected with a 4". I'll find out soon enough.

Thanks

Put those numbers into an energy calculator and it's considerable.