Currently building a 7prc on a Terminus Zeus quick change action. I see PVA is offering a prefit in 1:7 twist. I know most run 1:8, but has anyone messed with 1:7? I'm looking to run Berger 195 Elite Hunters and 190 LR Hybrids.
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1:7 twist rate for 7prc???
- Thread starter The Jake
- Start date
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Jakeweb09
Well-Known Member
You'll be fine, and be able to run the heaviest solids. I'd go with 8 if it's an option though
lancetkenyon
Well-Known Member
1:7" is really fast for a 7mm. 1:8" is plenty for 190LRHT/195EOL/197SMK. And 177 HHs.
Some of the heavy Cutting Edge solids (185 Lazer and 180/192 MTH) would need the 1:7".
Some of the heavy Cutting Edge solids (185 Lazer and 180/192 MTH) would need the 1:7".
Lance what twist would you do in 6mm if I want to shoot 110 Atip, 1-7.5" or 1-8" ?
lancetkenyon
Well-Known Member
1:7.5". That is what my 6CM runs, and shoots everything up to the 115VLD and 115DTAC amazingly. But is not overspinning an 85VMax.
So solids would need a faster twist rate even if they are the same weight?
lancetkenyon
Well-Known Member
Yes, because the bullet material is lighter (copper vs lead) and therefore the bullets are much longer, needing more twist to stabilize.
The Oregonian
Well-Known Member
Yes. Go look at the Hammer website and it will show the twist rates need for a bullet. Copper is a very different bullet than lead and requires a higher twist rate for a given weight of bullet.
Making sense now. Thanks! I'm still new to this LR game
Thank you
The Oregonian
Well-Known Member
Many people like to shoot smaller for caliber copper bullets and get the velocity up. At the same time, the BC can be lower so there are trade offs. Lots of considerations come into play.
I doubt I'll be shooting solids with this setup. I'll most likely be shooting Bergers at paper out to 1000yds and the occasional deer from the elevated blind.
