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Message: <blockquote data-quote="swampratt" data-source="post: 2852849" data-attributes="member: 15054">Heat up a potato or 4 in a microwave.. these hold heat a long time.Wrap in a hot towel and head to the range.Place some ammo onto these hot potatoes to heat up the ammo..Temp guns are your friend here or a fluke meter with temp probe...or something to measure the ammo temp.Shoot those at 100F and you can also have some other box with ice in it to test cold ammo.Many of those groups look very nice.. But you need to shoot them farther than 100 yards to really tell which one is good.When you have many loads that shoot as good as your gun is shooting you are wasting ammo and time shooting less than 200 yards to find which load is best.You do not need the hot potato.. you can keep ammo on top of the car engine and some in an ice chest for testing.Now do not take this heating out of context.. don't blow yourselfs up.It does not take much heat to get 100F</blockquote>