7 RSAUM in a Bighorn short action

[Arapaho]

I have searched this forum for an hour, sorry I'm a newby on the forum. I was hoping to chamber an 8 twist proof, carbon barrel in 7 RSAUM and screw in on a Bighorn origin short action. It will be a lightweight hunting rig, probably for 175 grain Nosler ABLR bullets, because I have several 100. I could switch bullets if need be but I would like to shoot at least 175s. The plan is to magazine feed and may go with a Wyatt's box to seat as long as possible. Does anyone have any real world experience with a similar setup and if so, what freebore reamer did you go with? I have seated a ABLR bullet to several seating depths to try to see where the junction is but I have not received the Wyatt's box yet so I don't know my exact seating depth. If anyone has experienced a similar scenario, I would appreciate your thoughts. I already have a couple hundred pieces of 7 saum, Normabrass, a proof barrel and an Origin action (just have to get a magnum bolthead).

 

[joshf303]

I take it you're against a DBM setup?

 

[Arapaho]

I take it you're against a DBM setup?

I am not totally against it, just really not a dbm type guy for a lightweight hunting rifle. Mainly for elk in the mountains. Will a dbm setup give me more room than the Wyatt's extended internal box? I know I'll probably have to notch the ramp. Looking hard at the Sherman but definitely going to do my homework.

 

[elkaholic]

I am not totally against it, just really not a dbm type guy for a lightweight hunting rifle. Mainly for elk in the mountains. Will a dbm setup give me more room than the Wyatt's extended internal box? I know I'll probably have to notch the ramp. Looking hard at the Sherman but definitely going to do my homework.

DBM will normally feed better

 

[Arapaho]

Thanks

 

[joshf303]

What is your definition of LW?

I long ago have up on the Wyatts boxes due to feeding and reliability. For the extra few ozs give me a DBM every time. DBM has never kept me from killing anything in the mountains, including elk. Run binderless Accurate mags and take advantage of the 2.990 available COAL. I've done a couple handfuls of SAUMs/WSMs/PRCs on short actions and notching the feed ramp ain't no thing....

Orgin 7 SAUM, 1/8 Brux #3 finished at 22". Weighs 8lbs 12ozs as pictured, but I could easily shave a full lb-lb and half off that rifle loosing the rail, heavy Burris rings (going with Talley rings) and swapping out the 28-30oz Manners EH1. I'm seriously thinking about adding a Manners Ultra Classic to the line up and play stock swaparoo depending on the use at hand. 17-18oz stock is crazy good....

 

[Arapaho]

Thanks for the input! I'm at 9lbs now with 26 inch proof, AG carbon fiber stock, scope, brake and bdl bottom metal. That is unloaded. I have experienced feeding problems with dbm (probably needed tweeking) and some of them rattle. Always just liked bdl setup better on a hunting rig. If it makes more sense and is more reliable, I would go dbm. I do have a couple of rifles that are setup with dbm and just run Magpul mags and they run smooth. They are paper and steel guns though in a KRG Bravo chassis. Of course ,those mags don't have much room inside because of the thick walls but they are cheap lol.

 

[joshf303]

Tweaking mag lips will do wonders...
I have not had to adjust the feed lips on any of the Accurate WSM mags. I'm running a 6.5 PRC out of one of the 308 mags now with no feeding issues.

Lots of ways to shave weight, but I wont compromise in the important stuff. IE..optics, and feeding/function.

 

[elkaholic]

I run an AICS 308 mag in my 6.5 sst (700 sa) I removed the front plate, which gives you another .080" on the aics, and spread the feed lips about .080" and it feeds like butter. An Accurate mag for a wsm should work great with mods.

 

[Arapaho]

Tweaking mag lips will do wonders...
I have not had to adjust the feed lips on any of the Accurate WSM mags. I'm running a 6.5 PRC out of one of the 308 mags now with no feeding issues.

Lots of ways to shave weight, but I wont compromise in the important stuff. IE..optics, and feeding/function.

Cool, what does the inside of your mag measure? I know I have to allow for a little room. I actually thought about going with an M70 action because they are more of a medium action. I just love my 300 WSM and would need to find another donor. Plus I need to dress this origin action with something and I love the SAUM.

 

[joshf303]

2.995

 

[Arapaho]

2.995

That may well be the route I have to go if I stay with the SAUM. I plan on seating one at 2.90 and checking my neck shoulder junction with the bullet I will shoot. Never know, it may be perfect.

 

[elkaholic]

That may well be the route I have to go if I stay with the SAUM. I plan on seating one at 2.90 and checking my neck shoulder junction with the bullet I will shoot. Never know, it may be perfect.

The saum will be over 3" with a 180 Hy or 175 EH seated properly. Much more with a 195.

 

[Arapaho]

Thanks for the information.