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I don't have any experience with 38 special ammo but I did shoot rimfire metallic silhouette years ago. On cold days, we would put our ammo out in the sun on in a pocket that held it close to the body to warm the ammo. It seemed to increase the velocity and help with drop. When shooting a 22 standard velocity round a 100 meters, we needed all the help we could get to get the round to shoot at the sight setting for warmer weather.