7 rum

[WeiserBucks]

Does the 7 RUM work well at mag length? Getting ready to load up some 180 hybrids for a Sendero. Any advice would be great, thanks .

 

[dok7mm]

I put a Wyatt's box in my son's 7rum and used hybrids. Turned it from a 1&1/2 moa shooter to a 1/2 moa shooter at 600+. With the long jump, a necessity because of pressure, the hybrids are just about the only bullet that worked in a 3.8" box. I also found it shot much better with 3-4 thou neck tension.

 

[WeiserBucks]

I've read about the Wyatt's box , I'm hoping it'll work without it . I would assume good results are possible at mag length, but It may be wishfull thinking.

 

[AZShooter]

You are going to have the best chance with those hybrids. They are seating depth friendly. I have loaded many from into the lands to jumps of over .150" with great results. I'd say load them to fit and feed from your magazine find out.

 

[WeiserBucks]

I should receive the rifle today, I'll measure the distance to the lands and see how much of a jump I'll be dealing with. Also, with the bullet seated to mag length, I've got a feeling it will eat up some case capacity.

 

[Lefty7mmstw]

I should receive the rifle today, I'll measure the distance to the lands and see how much of a jump I'll be dealing with. Also, with the bullet seated to mag length, I've got a feeling it will eat up some case capacity.

you will be dealing with a 4" or longer oal if you want to seat to the lands, unless you have a short throated 7rum... I've either run or set up three of these rifles, and all were just over a 4" oal...

I'm using the 180 sierra hpbt or 175 hdy interlock (at mag length... 3.650" or so) with enough retumbo (in rp brass with a 215) to hit 3100 fps. The rifle will shoot .5 to .6 moa all day long. As a factory sporter with a 20x Weaver GS on top I'd say were are in business...

As far as neck tension... I'm using standard rcbs dies... I don't like monster neck tension.. it tends to create run-out when you are over a couple of thou. neck tension...