7mm Rem Mag... Powder choice...

[N2TRKYS]

Magpro is giving me the speed and accuracy that I was looking for in my 7 SAUM.

 

[roninflag]

right from the alliant manual. 71.2 of re 26 and a 140 berger or 140 cbt. over 3300 very very flat.

 

[gohring3006]

After lots of bullets and lots of powders...

I thought I found my load and when through 8 pounds of H4350 70 gr with 140 gr Nos Bal Tip 3.34" in several of my 7mmRM rifles, I built and factory rifles.

But in 2015 I got a jug of IMR-4451.

It seems to be temp stable like H4350, but anti Copper fouling as well.

Good to know thanks

 

[MudRunner2005]

7977 is another good option.

 

[Scratch]

I've had great luck with IMR-7828 in my 7mm Mags. 66.0 grain pushing 175 NP at 3060 fps from a 26' tube. 100yds 5/8" three shot group.


Scratch

 

[wbyfireman]

Each rifle is different but in my 7mm rem mag, Savage LRH I got the best results with 168gr Bergers, 65.0 of IMR 7828ssc, .25 off of the lands. 2950 fps. 1" at 200 yds every time.

Good luck!!

 

[Clark]

Is that a quarter inch off the lands?
No wonder none of my rifles will shoot 1" at 200y every time

 

[dok7mm]

7977 is another good option.

I'm with Mud on the IMR 7977. Been doing some barrel break-in on a new 7 mag with 7977 and some "melting tip" 162 Amax while waiting on my 175 ELD-Xs. Barrel is a 9 twist Kreiger 26". During break-in, I noticed some very tight groups and decided to run a seating depth, max load and chrono tests while fire forming new Norma brass. The seating depth of .040" jump improved groups @ 100 to one hole. Max load was well above book max, but it was a cold day. I backed off 3 grs. and loaded five rds each from 69 to 71.5 grs. @ 200 yds. The winners were 70.0 (2936 fps) and 71.2 grs.(3027 fps), with .25 moa groups and SDs under 6 fps with Fed 215s. Trying not to get excited as they were only 5 shot groups, but still have to get info from larger groups @ longer range. I've had minimal copper fouling with 7977, but have to knock powder out @ 30-40 rds. as accuracy starts falling off. I am using HBN coated bullets and treated barrel, so remember to start low & work up. I just hope the 7977 works as well for the 175s, if they ever ship.