mil-surp shoots high?

S

saands

New member
I just brought my Browning BLR .308 out to the range and fired a bunch of Hirtenberger surplus through it. It shot nice groups considering the wind, but they were consistently 8" higher than both my Winchester Supreme and my handloads. Anyone have a good explanation? I'd settle for a mediocre one ;) The Win Supreme are 180 gr. and my handloads were 150's ... I noticed this a few years ago with some good Swedish 7.62x51 mil-surp.
Thanks,
Saands
 
"It's the vibes, man!"

Different powders and bullets create different harmonics, and some rifles respond more than others.

That's part of the reason to keep records of which load does what, as to impact point on a target. You can then easily either adjust the scope or use "Kentucky windage" when shooting different ammo from that for which your sights are set.

FWIW,

Art
 
I ran some of the Hirtenberger through my LTR and it groups about 8" higher than my Gold Medal Match at 100 yards . I no longer have a chronograph so I dont know what the velocity difference is . Like ART I keep a log for my rifles that shows where the different loads impact . Good luck , Mike...
 
I am not sure how much this affects a HP rifle, but with a pistol a mild low velocity load will shoot much higher than a high velocity load. The reason for this is that the gun starts recoiling while the bullet is still in the bore, thus the slower the bullet the more time the muzzle has to rise in recoil before the bullet leaves the muzzle. I am sure that the mil-surp is slower than a factory load in the .308/7.62, but with a rifle I am more inclined to agree with Art that it is the difference in barrel vibrations that cause the different point of impact. Probably it's a combination of both.
 
Actually, I'm not sure what an LTR is ... but it doesn't sound like it's a Browning Lever Rifle (BLR) ... so I'm inclined to believe it has something to do with the velocity, as two different rifles with exact same dynamic vibrational response to Hirtenberger seems like a stretch ... I think I might just have to load a few different velocities up and see if they progressively shoot higher as the bullets go slower. Mike ... how long is the barrel on your LTR? The BLR has a 20"

Thanks all,
Saands
 
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