Twist rate for .257 115 to 130 monos; 257 AI

[salmonchaser]

Sending off my ruger 257 roberts for a new barrel, I never should have bought a bore scope. Anyway going to have PAC NOR make me a 257 AI. Looking at 6 months out. Want to be able to shoot the heavier monos perhaps. Thinking on a 1/8.5 instead of the standard 1/10. What say you all?

 

[JD338]

The 257 AI has a ton of cool factor! I don't think it's a bad idea to go with the 8.5t. it will give you more options. A 6 month wait isn't too terrible. It will still give you 3 months for load development.

JD338

 

[AFG270]

I had PacNor rebarreled my m70 to a 25-06 several years ago, they did an excellent job. I went with a 1in9 twist, wish I had gone with an 8 or 7.5. Hammer bullets makes some great monos, they are accurate and deadly on game.

 

[RL338]

Want to be able to shoot the heavier monos perhaps.

I’d be looking at 7t or 7.5t if they supply them.

 

[Slimfinn]

I'd say 7.5" thats what the standard twist for the 25 creed so I would think alot of the new bullets would be based around that. That said hammer has one or 2 of theirs that need a 7"

 

[salmonchaser]

I just looked at some of the Hammers, I might just go faster than I first thought.

 

[JMRhino]

I also had PacNor make a .257 WSM barrel for me years ago and it does great with 115-120 cup and core and 80-100gn monos. It is only a 1/10 and has a tight throat so I haven't tried anything heavier. It produces great accuracy with traditional loads...

 

[salmonchaser]

My #1 is very accurate with 100 gr BT. Ok with 110gr Accubonds but they have been hard to find. The rifle really doesn’t care for anything 115 or higher. Best I can tell it is 1/10. She liked the 92 gr. Hammer as well. This particular rifle really only shoots the 100gr BT well, 3/4 moa consistently. Every thing else has been rejected out right or won’t break the 1 1/4 to 1 1/2 barrier. Even my 375 HH has two loads that go under 1moa.
I’ll probably increase the barrel length from 20 inches to 24 as well.

 

[SJB358]

I’d go 7.5 minimum myself and knowing me, I’d do a 7. Chances are it will still shoot 100 BTs great and it’ll open doors to about anything coming out you may wanna try. I’ve not found a problem with too much twist myself and probably overdo it but honestly I can’t see where it’s ever hurt me.

Increased RPMs do nothing but assist a bullet opening as well, from a light bullet moving fast or moderately heavier bullet moving a touch slower.

 

[cloverleaf]

Anybody know if Joel is alive? He could tell you everything you ever needed to know about the 257AI. I believe his was a model 70 featherweight. somebody should be able to give you the right twist rate. Whats a .25 Creedmore running? I would think that would work....CL

 

[SJB358]

Anybody know if Joel is alive? He could tell you everything you ever needed to know about the 257AI. I believe his was a model 70 featherweight. somebody should be able to give you the right twist rate. Whats a .25 Creedmore running? I would think that would work....CL

He is still alive. He made his 257AI into a 6.5x47 Lapua last I knew.