I have been loading IMR 4895 in my 223 for a couple of years. I have not noticed a difference in accuracy from season to season, but my point of impact does change, although very little.
I do not have a chrono, so I can't tell you what the difference in velocities are. I like to test my loads in the summer so there are no surprises with increases of pressure etc.
The load I have been using is not a max load, perhaps it gives me a little more "leeway" when changes in temp. occur. The most adjustment I have ever made from summer to winter was a couple of clicks in my scope to adjust my zero, and the grouping/ accuracy stays reliable all year round for me.
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