Powder for 7 mm Remington mag

W

Wendyj

New member
Got dies and trimmer for husbands 7 mag today. Any recommendations on a very accurate powder. Looks like IMR 4831 and reloader 20 is what most people post along with several Hodgdon powders. Not looking for maximum velocity or super long range. Wanting super accuracy. Thinking of starting with 139 grain Hornady SST. Hes never shot anything but Sierra BTSP out of the Tikka hunter he used to own but the Remington doesn't care much for this factory ammo. Lot of powders to choose from but would like your inputs. Max range probably won't exceed 300 yards.
 
For anything under 150gr I run IMR 4350 and anything over 150gr, I run 7828. Both those powders have produced great accuracy in my rifles.
 
I normally shot 140 gr. in my Savage 110. It really liked RL-22 (and so did I). Once I settled on a load, I didn't really play with the others much
 
For my 139gr. SST's I'm using either Reloder 22, or Reloder 25.
Hogdon H414 has worked very well for the accuracy dept.

Savage 111, 24" barrel, composite stock, cheap a$$ bi-pod, Redfield Revenge 4-12x42 scope with varmint accu-reticle.

Oh, BTW, I load my SST's 0.010" off of the lands.
 
CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information.

This is 11 gr more than the Hodgdon published max, but I find it 2 gr below the threshold of extractor groove growth. I have used it in a factory Browning 1885 in 2014 and in a Rem 700 that I built with a shilen barrel in 2013.

I shot (3) groups with it in 2014 with the Browning:
1) 1.0" 3 shot group at 100 yards = 1.0 moa
2) 3.6" 3 shot group at 450 yards = 0.8 moa
3) 7.2" 3 shot group at 550 yards = 1.3 moa

70 gr H4350 140 gr Nos Bal tip Moly 3.34" chronographs 3400 fps
Quickload predicts 3389 fps 75 kpsi

2014buckc.jpg

2014

clarkantelopeb10-18-2014.jpg

2014

Buck2013436meterss7mmRemMag.jpg

2013

Those are animals I shot, but I also have a pic of a big elk bull shot by a friend of a friend with a 7mmRM in 2014 with teh 139 gr SST
 
Im with jwrowland77, my rifle is a model 70,26"1-9.5" , freefloated and pillarbedded, and recoil lug bedded, it loves IMR 7828 and 160 grn Accubonds, as well as Berger VLD's in 168.
Clark my threshold for pain stops at around 60,k psi... Wow 75kpsi?. How does that feel?
 
I loaded for 7 mag briefly. I found 4831 to be accurate, but slow. RL 25 was the only powder I found that offered good accuracy and velocity that would beat my 30-06 with similar bullet weights. And it wasn't much faster.
 
In my son's 7mm RM we've tried IMR4350, IMR4831, R17, R22, and IMR7828SSC. All have given us around MOA accuracy at some point in load development using 150 grain to 160 grain bullets.
 
7 REM. MAG Loads.

WENDY; Try IMR 4831/R-P Brass/9 1/2M primer/Sierra 140 BTSP or FB.
One load I worked up in'76 for my RUGER 77 used 66.4 gr. with the above components and .020" off the lands. Three-shot cloverleafs still go .275"@ 100 yds. w/2 min. between shots with either bullet.. Adjust load to your rifle, but it should work in yours.
GOOD LUCK.
WILL.
 
IMR 4831 was all I could find. Printed Nosler load for 140 gr bt and loaded 62 grains showing there most accurate load. Bullet seems awful long out of brass. Nosler says oal with this bullet at 3.290. Factory core lokt measures out at 3.175. Is that natural for bullet difference? Trying to follow specs as close as possible. Powder was measured on linear and digital scale. Didn't seem to fill cartridge as much as my 308 loads. Trying to be safe.
 
IMR 4831 was all I could find. Printed Nosler load for 140 gr bt and loaded 62 grains showing there most accurate load. Bullet seems awful long out of brass. Nosler says oal with this bullet at 3.290. Factory core lokt measures out at 3.175. Is that natural for bullet difference? Trying to follow specs as close as possible. Powder was measured on linear and digital scale. Didn't seem to fill cartridge as much as my 308 loads. Trying to be safe. Bolt seems to close good with no resistance.
 
Yes. Each bullet has it own length, each rifles different, each testing is done with their own length, each bullet has a different spot where the ogive is.

I generally run mine .02" off the lands a 139gr Hornady BTSP. OAL is 3.300"
 
I've sent once fired case out of 7 mag and 308 to Hornady to drill and tap. Still waiting on Hornady oal guage. I've tried the crimped bullet. Soot sharpie. Guess I don't have the feel for it.
 
IMR 4831 62 grains of powder under 140 gr nosler bt. Remington brass Remington 91/2 magnum primer. Only loaded 10 but husband is really happy with groups. Under a dime at 100 yards.
 
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Remington's original factory loading used a bulk lot of IMR7828, I've used this powder (canister lot) in my 7mm mag and was quite pleased with the results. Nosler 150gr Partitions or their old SP bullet preformed flawlessly with very good accuracy! William
 
First 3 trial shots under a dime. Used three more to get zero at 2.5 high. Let barrel cool 20 minutes. Put 3 more dime size at his zero point. He wasn't much into reloading. Can't get him off the scales and press now. Now he's been all over web trying to find velocity and energy at 100 and 300.
 
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