I plan to get some readings in real high temps this summer with TAC, H4895, 8208 XBR, Leverevolution and 2000MR and then repeat on a relatively cold day next winter. Wonder if keeping rounds iced and then chambering them and shooting quickly would reasonably replicate winter temps. barrel wouldn't as cold, and as long as it was shot very quickly the primer and powder wouldn't get heated up much. Certainly not the powder anyway. Hmmm, something to try.