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**44 AMP** · May 1, 2007, 08:21 PM

You get less performance (from almost everything) in cold to very cold weather. Manufactures try hard to improve it, and many products today are better than they used to be, but it still remains generally true.

The old rule of thumb is to always work up your loads in hot weather. If a load is safe in hot weather, it will be safe in cold weather. The reverse is not necessarily true.

And even in hot weather, some common sense precautions are in order, such as don't leave your ammo in direct sunlight for long periods, or worse yet, in a car window.

Expect a velocity loss when shooting in cold (below freezing) and very cold (below 0) temps. Some powders are more sensitive about this than others, but all are affected to some degree.

May 1, 2007, 08:21 PM	#12
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 28,839	Old rule of thumb You get less performance (from almost everything) in cold to very cold weather. Manufactures try hard to improve it, and many products today are better than they used to be, but it still remains generally true. The old rule of thumb is to always work up your loads in hot weather. If a load is safe in hot weather, it will be safe in cold weather. The reverse is not necessarily true. And even in hot weather, some common sense precautions are in order, such as don't leave your ammo in direct sunlight for long periods, or worse yet, in a car window. Expect a velocity loss when shooting in cold (below freezing) and very cold (below 0) temps. Some powders are more sensitive about this than others, but all are affected to some degree. __________________ All else being equal (and it almost never is) bigger bullets tend to work better.