FinnM39 ammo test / and a question

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_N4Z_

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Michigander lost in... The Yonders, Oklahoma
S&B 7.62x54 180gr SP's
Hungarian 7.62x54 182gr heavyball lead core <-- revisited
Hungarian 7.62x54 182gr heavyball steel core

34 degrees F outside and raining. Cold and wet, but still a good time, and better than any day at work! :D


So I shot a few warm ups and then went to it. 3 shot groups at 100 yards, wind at my back. Several targets lined up across the backstop. Shooting off some sandbags in a concrete bench.

All grouped a little high at 100, to be expected, and all grouped in the 3" range. The S&B in a pic below suffered a flyer which was my fault.

The steel core surplus though took the day producing a 1.75" group, which to date is the best coming out of this rifle. First pic is right when I got back. Second one is better as the target had dried out some. Note the third pic - a S&B group one the left by the rifle. Seems the surplus fodder still beats out the new stuff in terms of accuracy. The lead core Hungarian, which I have tried before, still gives great results accuracy wise, but the steel core edges out in this rifle.

So the only things I've got left to try at this point are Brown Bear 185 FMJ, Igman, and both Bulgarian and Albanian surplus. Think maybe for now I'll try the BrownBear, if I can find some locally, and just go ahead and order a spam can of steel core Hungarian stuff.

m39001.jpg

m39take2003.jpg

m39take2001.jpg

Also have noticed that as the barrel heats on this rifle, my groups migrate to the right. The barrel is floated so I am wondering if there is anything to be done about this? Thanks.
 
The shift to the right is probably caused by unrelieved stress in the barrel, there is no easy cure for it. Metal expands when heated, combined with internal stresses from machining, rifling, even when the blank was formed, all cause it to move. If one side of the barrel can't cool as quickly as the other, it may bend. The trick is to let both sides cool, or cover both sides so they stay hot. Top barrel makers stress relieve their barrels, military contractors probably don't.
 
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