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Old March 27, 2009, 08:16 AM   #3
Bart B.
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Join Date: February 15, 2009
Posts: 8,927
Jim, he probably didn't do well due to barrel wear. Many top bolt gun shooters could tell when their barrel's throat had eroded far enough that muzzle velocity had dropped enough to be noticed. When shooting at 600 yards at the same range and shooting conditions, their recorded sight settings for zeros would start coming up in elevation. Evidence that bullets were leaving slower needing more elevation to strike center. This usually happened around 2500 to 3000 rounds of barrel life in the Hart barrels they used. And of course, thoat erosion gages prooved this to be the cause.

This happened to me with a 7.62 Garand whose throat erosion gage read 4 in the 1965 SA barrel it had, so I took the M1 back to the shop that built it and they replaced the barrel (in 10 minutes, mind you!!!). It did very, very well after that with the same batch of handloads with 168's at 1000 yards.

Last edited by Bart B.; March 27, 2009 at 08:30 AM.
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