1-8 twist 7mm Rem Mag

[RBlevins]

So yesterday I finally order a contoured and fluted .284 blank for mysef, been sitting on a Rem 700 LA mag action for awhile. I've always wanted a Sendero and haven't been able to find a factory setup that I thought was a fair price in a long time, so I'm building my own.
I know that my plan is shooting 180-190gr pills in it, my question is how will lighter 140gr loads work out of a 1-8 twist? I'm sitting on a lot of factory 140gr loads.
Thanks

 

[Lefty7mmstw]

So yesterday I finally order a contoured and fluted .284 blank for mysef, been sitting on a Rem 700 LA mag action for awhile. I've always wanted a Sendero and haven't been able to find a factory setup that I thought was a fair price in a long time, so I'm building my own.
I know that my plan is shooting 180-190gr pills in it, my question is how will lighter 140gr loads work out of a 1-8 twist? I'm sitting on a lot of factory 140gr loads.
Thanks

just fine.. I've been running 140 ab handloads through my 8" twist 7stw for years. My avitar is a buck I brained at 300 yards with the rifle a few years back.

 

[AkleyFan]

I have two McGowen barrels in 8 twist on 280AI's, each shoot the 140 and 160 grain bullets 1/2 MOA and better. I do find that my loads are about 150fps slower than others runnng the exact same load. I'm not chasing speed, just consistent accuracy, which I have in spades. YMMV

 

[WeiserBucks]

It'll work great, every 7mm should be an 8 twist.

 

[Mark37082]

It'll work great, every 7mm should be an 8 twist.

Wish I had thought of this before buying my last 7RM. Went with 8 twist on 280ai build. It opens up a lot more options than the old standard 9.5 twist.

 

[Lefty7mmstw]

Wish I had thought of this before buying my last 7RM. Went with 8 twist on 280ai build. It opens up a lot more options than the old standard 9.5 twist.

Truthfully, the faster twist really doesn't matter until you have the boiler room to move the 175+ slugs well. It helps with the 7stw/7rum/28 nosler. The 168-175 older style pills still spin just fine in a 9'ish twist and the extra velocity from the lighter pills in smaller chamberings usually makes up for the slight loss in b.c. ...

 

[WeiserBucks]

Depending on who you ask, more twist increases terminal effects of the bullet. I'm on board.

 

[Fiftydriver]

So yesterday I finally order a contoured and fluted .284 blank for mysef, been sitting on a Rem 700 LA mag action for awhile. I've always wanted a Sendero and haven't been able to find a factory setup that I thought was a fair price in a long time, so I'm building my own.
I know that my plan is shooting 180-190gr pills in it, my question is how will lighter 140gr loads work out of a 1-8 twist? I'm sitting on a lot of factory 140gr loads.
Thanks

Probably just fine at the velocity levels the rem mag will produce. I would be surprised if you had issues unless your using really thin jacketed bullets or unless your new barrel has very wide lands like some 3 groove barrels can.

 

[VinceMule]

I run 11twist .030 FB for120g TTSX & 120g Nosler solid base lead tip, 140g C/T, accubonds & TTSX, 7 STW, and 9T .210 FB for 160-175's, 7 RM, 500 feet elevation. Wyatt's extra length mag box and follower is very practical.

Twist according to your needs, ONLY.

Since I know my needs, I do not have to put the fastest twist made per caliber on my rifle.

 

[jltroberg]

7 rem mag 26" barrel 175 Berger Elite Hunter 8 twist best accuracy at 2950fps. 5 shots .338". Shoots 1020 yard targets at my range no problem. 8 twist is the way to go. Thinking of building a 7prc, just to use a 22" barrel. And… it's just fun to build new guns.