Thread: Recreating a Hornady 139g SST for 7mm RM

Originally Posted by YosemiteSam

I'm trying to simply copy the 139g factory rounds I use...139g Hornady SST for 7RM.

I just pulled a projectile and measured the charge: 77.5 grains of powder in the factory round.

I've checked and rechecked and I measure 77.5 every time. But on every chart I've seen 77.5 is way into the redline. It looks like you get a compressed load by the time you get to 75 grains.

So does anybody know what powder is this? And how much 2217 or 2213sc do I need to get the same whoomph?

Hoping somebody can point me in the right direction.

You might find the the Factory secret powder is more dense than those to powders giving it a greater weight for it's size. I also agree however, You might as well be useing a 708 if you are going to run such a light projectile. I have used the sst in 154 if I remember correctly out of my RM. With very good results, Have now moved on to 162 AMAX,