BoatBanter.com - View Single Post - Don't throw snowballs at each other if...

Wayne.B

On Thu, 05 Feb 2015 13:15:28 -0500, wrote:

If you are really that interested in precision shooting you should be
shooting match grade ammo.

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Exactly. I was talking to one of my shooting buddys yesterday who
competes with his custom 223 at 300 yards. He uses match grade ammo
of course but he's noticed that the performance changes throughout the
day as temperatures warm up. As a result he has started keeping his
unfired ammo in a styrofoam cooler with a bit of ice in it to maintain
a constant temp.

I would worry more about the barrel temperature

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Once you fire a shot or two the barrel comes up to a fairly uniform
and constant temperature. Typically they allow some sighting shots
before the actual competition begins.

The effect he was noticing was directly related to the ammo and
depended on things like whether it was stored in the sun or in the
shade, things like that.