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Old November 5, 2012, 04:10 PM   #21
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Join Date: October 18, 2006
Posts: 6,214
Looking at Hornady 308 Win Superformance GMX, we see 2940 fps. 24 inch barrel.

Looking at Alliant's data, we see AR-Comp max charge 2929 fps, 24 inch barrel. 11fps difference is close enough for "duplication" to me. Hogdon lists CFE 223 and a 150gr Nosler to 2974, which isn't the same bullet, but sure as heck is a higher velocity.

Moving up to the 165 GMX, Hornady Superformance lists velocity as 2750. Alliant lists both AR Comp and 2000-MR in excess of 2,800 with a 165gr Speer BTSP, not the same bullet unfortunately. Hogdon lists CFE and a 165gr Hornady BTSP to over 2,800 fps as well.

I really don't think that Hornady's Superformance line is really all that special. Pawpaw took apart some Superormance ammo a while back and commented that it sure looked like 2000-MR but with some weird green grains mixed in.

I dissassembled some of my 75gr BTHP 223 loads that I loaded this spring with 2000-MR, and guess what I found, some weird green grains that weren't there when I loaded the ammo. I don't know what that means for powder longevity, but it seems to me that handloaders can easily reproduce Superformance performance by picking appropriate powders.

Machine guns are awesome until you have to carry one.
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