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Getting ready for my first precision rifle build. My question is, is there any real world difference between an 8 twist and a 8.5 twist barrel for use with the heavier projectiles (139-142gr)?
Getting ready for my first precision rifle build. My question is, is there any real world difference between an 8 twist and a 8.5 twist barrel for use with the heavier projectiles (139-142gr)?
Unless your at sea level shooting in extreme cold temps a 8.5 twist will do ya just fine.I'm 550' roughly and have zero problems with the Berger 140 Hybrids or 142SMK's.
I'm at sea level. My first barrel was a straight 8 twist. This one, my second, is a 8.5 twist and it shoots faster and is more accurate than my first. Now the accurate part I would not say is totally due to the twist. I am going to try a gain twist 9.5 to 8.5 on my next one to test. I should get about another 30 fps just with that change. I shoot 139gr Scenars.
I have an 1-8 twist benchmark barrel 24 inches long, it shoots everything lights out, from 120 to 142 doesn't matter. Not sur of the altitude around here but the sea is not far down the hill.
I shoot a rock creek 1:8.5 twist at sea level (well 300') and I shoot 142's and they preform great. A lighter twist will yield you a bit more speed and won't beat up the projectiles as bad. Either one will work just fine, i over thought this so much and now that I'm more experianced i laugh at myself when I look back. Now i just buy whats in stock somewhere. Just my .02