Don't forget about Matrix the Hammer bullets and Nosler 165 ABLR. The 139 Absolute Hammer requires 1:9 and the 156 Hammer Hunter 1:8. The Barnes 150 TSX & Noz 165 ABLR again 1:9. You never know what is going to shoot well out of your barrel so might as well give yourself as many options as possible. Matrix is closed I think but they may come back. If this 270 fast twist thing starts catching on more high BC bullets could be offered in the not to distant future. I like your recommendation of a 26 inch barrel. Definitely not under 24 or just might as well get a 270 win.Whether you require faster than 1:10 depends solely on whether you intend to shoot the Berger EOL Elite 170 grain bullet, but you definitely need a minimum of a 26" barrel for a 270 WSM. All the factories, especially Browning with their 23" has it WRONG! That's precisely why you need to create custom work and why there's a high demand for it.
Nosler calls for a 8.5 twist for the 165s. Their M48 in 27Nosler has an 8.5 twist.With a faster twist rate you could run the 165ABLRs!
Thanks for all the good replies.
I checked out Berger's Twist Rate Calculator and looks like anywhere from a 8:1 to 10:1 would work for a 140gr to 150gr bullet. But when I go to the 170gr VLD it looks like I want a 8.5:1 minimum. Do the barrel guys even make a 8.5:1 or are you limited to 8:1 or 9:1?
If I went with a 8:1 over the 9:1 what would I be giving up with the 140s and 150s? Anything? Or in other words, why would I not want to go with a 8:1 since it'll also handle I talked to Berger tech
I talked to the Berger tech guy and the 170 EH needs a long action. I would do a 9T 24 inch barrel and shoot the 150ish gr bullets out of a SA. I shoot 130 gr Berger CH's at only 3089 fps. It does the job at .5 moa sd of 7.I finally shot the barrel out of my 270WSM. I'm going to have it rebarreled and customized… action trued, lug pinned, and bedded. I own a couple custom sticks but have never built my own. I'm going to stick with the 270WSM caliber and the primary purpose will be hunting, mostly deer type game. I handload and currently use 140gr accubonds in my load of choice but would also like to maintain some bullet flexibility for the future.
I've never built my own rifle so wanted to tap some of the experience on here and see what folks would recommend for barrel length and twist? I don't need a 1000yd gun with this one. Maybe 800yd range gun and 600yd hunting rig. Weight is a consideration but I don't need an ultralight mountain gun.
It's going to be one of my all around general purpose hunting rigs.
Thanks for any insight.
Handicapping a cartridge to stay in a short action is counterintuitive nowadays. There's better ways to save 2ozI talked to the Berger tech guy and the 170 EH needs a long action. I would do a 9T 24 inch barrel and shoot the 150ish gr bullets out of a SA. I shoot 130 gr Berger CH's at only 3089 fps. It does the job at .5 moa sd of 7.
I am very partial to 26" barrels and for your build 1:8. Just me!I finally shot the barrel out of my 270WSM. I'm going to have it rebarreled and customized… action trued, lug pinned, and bedded. I own a couple custom sticks but have never built my own. I'm going to stick with the 270WSM caliber and the primary purpose will be hunting, mostly deer type game. I handload and currently use 140gr accubonds in my load of choice but would also like to maintain some bullet flexibility for the future.
I've never built my own rifle so wanted to tap some of the experience on here and see what folks would recommend for barrel length and twist? I don't need a 1000yd gun with this one. Maybe 800yd range gun and 600yd hunting rig. Weight is a consideration but I don't need an ultralight mountain gun.
It's going to be one of my all around general purpose hunting rigs.
Thanks for any insight.
I have come to the conclusion on my wsm build, to shoot the 170s on my SA, I'm gonna be single shot. Then develop a 150 for hunting. Glad I found this thread, I was torn between 24" or 26".Handicapping a cartridge to stay in a short action is counterintuitive nowadays. There's better ways to save 2oz
I am going to have to go at 7 or 7 and 1/2, the company I'm working with does not offer an 8. Would you recommend a 6 groove, or a 5r twist?I would go a 24" to 26" tube, 1:8" twist, flute the barrel and run a #6 straight taper. I have had great success with that combo with friends and clients with various calibers.