On Fri, 6 Feb 2015 05:29:15 -0800 (PST), Tim
wrote:

When I was shooting competition with the Garrand I let the loaded clips sit in the sunlight if there was any. I don't know how much effect it had at 300m over cool ammunition. I couldn't tell much diffrence in their performance.

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The fellow I was talking to the other day shoots a highly customized
223 with very tight groups at 300 yards. He said that he was seeing
elevation differences of 2 to 3 inches between hot and cold ammo.