Powder for 7mm Rem Mag

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RielM

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Helping a buddy out and reloading some 7mm Rem Mag for him. What powder should I start with? For now might try a box of Hornady ELD X 175g or something similar.
 
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IMR 7828 was originally developed with the 7mm Rem Mag in mind, and usually works very well with bullets weighing 160-175 grains.
RL 22 or 23 are also good, Norma MRP, VV N165, H1000, RL 25 or 26 alll work well in the big 7. Dave.
 
There's a dozen or more very suitable choices

H4831
H1000
Retumbo
IMR 4831
IMR 4955
IMR 7828
IMR 7977
IMR 8133
RL19
RL22
RL23
RL25
RL26
RL33
Ramshot Hunter
Ramshot Magnum
Ramshot LRT
Vihtavuori n560, n565

175gr ELDx may not shoot very well from the common 1:9.5 twist
 
ELD bullets are picky and long. I ran a batch of 175 interlocks over 4350 powder with great success. I won't post the load but it was over most currently published max.

Went down to a 150 grain when I found the heavy interlock was undesirable at close range at that kind of speed. Did pass through an elk at 420 yards though.
 
My reloading mentor has always said from his experience that Magpro is THE 7MM Rem Mag Powder for the heavier bullets (160-175 gr).
Many of the other good powders have been listed above already.
 
oneadam12 said:
ELD bullets are picky and long. I ran a batch of 175 interlocks over 4350 powder with great success. I won't post the load but it was over most currently published max.

Went down to a 150 grain when I found the heavy interlock was undesirable at close range at that kind of speed. Did pass through an elk at 420 yards though.
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An interlock is a poor choice for the 7mag, too much speed for a cup and core bullet. If anything I'd expect the 150gr to be more explosive due to higher velocity though?
 
Suther said:
An interlock is a poor choice for the 7mag, too much speed for a cup and core bullet. If anything I'd expect the 150gr to be more explosive due to higher velocity though?
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I loaded down the 150 some. Didn't need to turn it into a laser, was for shorter range and didn't drop like the bigger slugs anyway. Does expand quite well though.

Funny thing about the big interlock, I actually found it didn't expand worth a lick at anything under 150 yards. Kept getting clean pass throughs without expansion on deer, very little internal damage and a startling lack of the proverbial stopping power over a couple years so I gave up on them for it. Unless you nailed the spinal column or something else substantial they were quite disappointing really. YMMV but I went through a box or two along the way.
 
I use H4831 with 162gr ELD-M in a 700, single digit ES, very predictable out to 1000m which is as far as I've tried them.
 
Dogleg said:
I don’t know about that. We killed the ever-loving crap out of things with the 139 and 154 Interlock in the STW.
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Were you hunting for meat or culling? No doubt they kill, I figured they'd be a bit on the explosive side and you'd lose more meat than with a more stout bullet though?
 
Lots of good suggestions so far. Ive had the best luck with

H4831sc
Retumbo
H1000
Imr7977 all of which are temp insensitive which is pretty important to me.

Imr7828 and rl22 showed good velocity and accuracy with 162gr bullets but in the end i went with the extreme powders.
 
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