Originally Posted by
stapher1
Yes, it does. A slow twist will be faster than fast twist. Think of a bolt with fine or course threads. The more the bullets turns in the barrel, you get more drag and a loss of speed. I don't know how much difference there is between the rates you have listed but i think it wouldn't be that big.
I've actually heard this both ways. One guy says that the more turns in a barrel, the more drag, so the slower it goes. Another guy says the more turns in a barrel, the more drag, so the more pressure it builds against the progressive powder, so the FASTER it goes.
Honestly, I worry MUCH more about bullet stabilization than muzzle velocity. I can lob a 300grn bullet from a .45-70 a LONG ways out there and still make a hit, only travelling 2200fps at the muzzle. As long as my muzzle velocity is consistent from shot to shot, I wouldn't necessarily care if it's a touch slower, or faster, due to a different twist.