9 twist 257AI

[Barlow]

The barrel on my old Ruger 77TS, 257AI has died. It happened pretty fast, all of a sudden it just will not group. It always shot 100 gr Hornady's with my load 1/2 -3/4 moa, now it's 2" to 3"moa. A Hornady 100 gr sp just barely makes it into the case when checked with Stoney Point tool. Bullet jump at present seating depth around .080. I'm thinking about a 9 twist 24" Rock Creek or others that are recommended, as it never shot bullets heavier then 100 gr reliably. Any advise appreciated. Barlow

 

[JRS]

A 10 twist will work just fine, but the 9 twist is the way to go if you are going to shoot bullets heavier than 100 grains. I'm having a 250 Ackley built right now with a Brux 9 twist barrel.

 

[Barlow]

A 10 twist will work just fine, but the 9 twist is the way to go if you are going to shoot bullets heavier than 100 grains. I'm having a 250 Ackley built right now with a Brux 9 twist barrel.

Have you had any other 9 twist 25's,if so, how did they work? Barlow

 

[JRS]

Have you had any other 9 twist 25's,if so, how did they work? Barlow

Yes, and they work like magic The 9 twist is the optimal twist rate for long 110-120 grain bullets, although a 10 twist works just fine.

 

[Barlow]

I just ordered a 1 in 9 from Rock Creek. Gives me a project for this next winter. Barlow