270 weatherby mag rebarrell or rechamber ?

[Mcranch1242]

I have an H series 270 weatherby nine lug I purchased in 89. I have used it and have considered a rebarrell job. I have just read an article dated January 2020 concerning the 27 nosler with a 1-8.5 twist able to push a 165 grain projectile. My question is will the bolt face on my action accept the .534 rebated 27 nosler cartridge? Has the barrel twist of 1-8.5 been tried on the 270 weatherby nine lug action by anyone on this site with good results in using heavier bullets? I also have read about a 6.5 / 257-270 weatherby by McWhorter? If I get to the point that the barrel is shot out I would want to see what options I would have. My thought is a Krieger or Bartlein barrel 1-8.5 twist possibly in 5r 26”. Anyone have any experience with a rebarrell in this configuration? If there is a blog that discusses this please direct me. Seeking to be informed.

[txaggie]

Here's some data i looked at recently on bolt face sizing:


Long actions with a bolt face .Dia of .540 +/-
257 Weatherby, 264 Win Mag, 270 Weatherby Mag, 7mm Rem Mag, 7mm Weatherby Mag, 7 STW, 7mm Rem Ultra Mag, 300 H & H, 300 Win Mag, 300 PRC, 300 Weatherby Mag, 300 RUM, 303 Brit ,8mm Rem Mag, 338 Win Mag, 340 Weatherby Mag, 338 RUM, 375 H & H, 375 Weatherby, 375 RUM, 416 Rem Mag, 458 Win Mag, and the 458 Lott.


Also i had a 300wby rebarrelled to 7mm stw last year when doing my research only 3 companies out of about 20 inquiries responded with a quote and interest. Bartlein was one and actually the middle bid and ultimately my choice. It was a 28" 3 contour with 1-8.5 twist. She shoots like a dream, however she came with a pretty big cost the barrel job out the door to me was just a few dollars shy of $1,200 bucks. Installed and everything for stainless barrel - so inquire and see if they will 1 accept the job and 2 what's it going to cost. Rebarrelling isn't always as cheap as it's made out to be when you go outside the box like your thinking here. Being that this is a new caliber i would suspect your going to have to hunt hard.

Me personally, for the 160-175 glass bullets i really wanted the 7mm stw was just diff and that's what i liked about it.

good luck with your decision;

[bluemts]

I have 7mm rem mag getting rebarreled, 26" 1-7" twist. Will be perfect for me to shoot heavier Hammer bullets. I just asked Weatherby if i could order a 7mm Weatherby mag back country with a different twist barrel. we'll see. good luck. let us know what you decide and how it works out for you.

[GrandeJuan]

If you already have an investment in reloading supplies, I'd rebarrel to something like 1:7.5 or 1:8.0, #3 or#4 contour, 26 inch. It will shoot lighter bullets fine and be plenty for 165/170 bullets. GJ

[Van]

I put a Lilja barrel on mine, kept it a 270 mag couldn't be happier.

[Greenheadjed]

I have a rifle in 257X6.5 Wby like McWhorter makes.  Mine is not on a Mark V action, but that would work fine.  The round has been a lot of fun and is deadly on deer with a 140 Berger VLD.  It is very hard on the throat!  When my accuracy declined, I started loading the bullets out further and got most of the accuracy back.  Before it went away again I had the barrel cut back and rechambered.  When accuracy goes south again I will turn it into a 7mm Weatherby.  My 6.5 barrel is an 8.5 twist Krieger.  I've had great luck out of them.

[224KING]

How fast can you run the 140 Bergers out of the 257 case?

[Greenheadjed]

I originally ran them at 3278 fps, but I ended up at about 3250.  In my rifle that is pushing it.