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Old 11-30-2007 | 07:38 AM
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CZ2506
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Default RE: Cold barrel, poor accuracy
ORIGINAL: scott26

with my Savage 116 in 7mm-08. Shooting just 50 yards with Rem core lokts 140 grain the first 2 groups is always 3 - 4 inches. After that my groups tighten up to 2 inches roughly at 100yds.

Question is is that normal for most factory ammo or should I try a different type? Please excuse the simplicity of my math but if my rifle is say three inches right at 50 yards is it not 6 inches off at 100yds and 12 inches off at 200? First shot on a cold mornings hunt will of course be through that cold barrel. Still trying to learn some basics so any input you may have is greatly appreciated. Thanks in advance.

Scott

Scott
Slight variation on the original question. When a barrel heats up after the first 2-3 shots, the inside diameter is going to change. That has to affect pressure, velocity. Could that be part of the reason zero changes so often.
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