1:7 twist rate for 7prc???

[The Jake]

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.

 

[Jakeweb09]

You'll be fine, and be able to run the heaviest solids. I'd go with 8 if it's an option though

 

[lancetkenyon]

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".

 

[Reemty J]

Lance what twist would you do in 6mm if I want to shoot 110 Atip, 1-7.5" or 1-8" ?

 

[lancetkenyon]

Lance what twist would you do in 6mm if I want to shoot 110 Atip, 1-7.5" or 1-8" ?

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.

 

[The Jake]

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".

So solids would need a faster twist rate even if they are the same weight?

 

[lancetkenyon]

So solids would need a faster twist rate even if they are the same weight?

Yes, because the bullet material is lighter (copper vs lead) and therefore the bullets are much longer, needing more twist to stabilize.

 

[The Oregonian]

So solids would need a faster twist rate even if they are the same weight?

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.

 

[The Jake]

Yes, because the bullet material is lighter (copper vs lead) and therefore the bullets are much longer, needing more twist to stabilize.

Making sense now. Thanks! I'm still new to this LR game

 

[The Jake]

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.

Thank you

 

[The Oregonian]

Thank you

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.

 

[The Jake]

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.