280imp or 284???

[Raptor]

Hey guys my son in law is thinking about building a long range hunting rifle/target rifle to do some 1000yd shooting with and is looking at the 7MMs.

He is wanting to go with either a 280imp or a 284 and shoot some 168 Bergers. Which one would be the better choice for him??? Any of you guys shooting either of these??? Thanks!!!!

 

[Preacher]

Either one of those calibers are great, and I own some of both, but my newest love is my 7mm SAUM. It's a big improvement over the other 2 in both accuracy and powder burnt to get the job done. I like it so much I bought a 7mmSAUM improved tight necked dedicated reamer for the next project coming up to shoot 162 grain A-max's.
Try it you'll like it 'O)

 

[AlanPF]

Preacher,

What brass is available for 7mm SAUM?

Alan

 

[Raptor]

Preacher,
Funny you should mention that I was thinking along the same lines but have heard brass is not so good and may be hard to get in the future. I like the rem SUM case better than the WSM case. DO you know the case cap. compared to say the 284 case??? Thanks!!!

 

[JeffT]

Norma is making 300 SAUM brass along with Remington in 7 and 300. I did a capacity test using H335 powder, filled to top and scraped off level, results were:

300 wsm,norma) - 84 grains
300 saum,norma) - 77 grains
6.5x06 A.I.,norma 270) - 77
6.5X284,Lapua)-71

 

[Preacher]

Remington brass is all I have used and it has checked out better than most folks say it will on my Juenke spinner, and a digital scale.
I have about 600 cases bought up so I doubt I'll run out any time soon.
The brass is still available now but some folks say it will disappear one of these days.
My tight necked .284 holds 65.8 grains of 2460,the only ball powder that was close)
My factory 7mmSAUM holds 75.0 grains of 2460......
Both cases were fired a few times.

 

[asreder]

Preacher. I am Raptors son in law, and was wondering if you knew the differences you've seen in velocities between the 7mmSAUM,WSM,and the 284,and how much better was the accuracy. thanks.

 

[Preacher]

I can't help much with the velocity differences because I've never shot a 7mm WSM and my 284 is in a 16 inch XP-100 that I hunt deer here in SWNY with.
My 7mm SAUM is a 24 factory barrel that spits out 140 grain Ballistic tips at just a bit over 3100 fps with 61.2 grains of H-4350 and likes to keep them in little bunches 'O)
It shoots better than any 7mm I have ever owned.........

 

[Bolo]

Preacher, case capacity of the 7 Rsaum is about equal to the 280AI,but with better efficiency. My 7 Rsaum has a Kreiger 28. 62.3gr R-25, PMC Russian mag primers, Berger 180s, COAL 3.1". I get 2980fps. If you look back at the UK 1K BR record; He used a 7/300 WSM with R-25, Berger 180s at 3k fps also.