Re: RL25 Temp experiment
Starting temp is not as important as barrel temp. "Cooking the load" can cause barrel shift/warp. It is not that velocity changes as much as the barrel. Yes, velocity increases with barrel temp (powder temp). Most ballistics programs can compensate for this. If you zero in at 70 degrees and you are shooting at 40, you simply input the current powder temp. You can test your barrel by shooting multiple rounds while focusing at the same spot. As your barrel heats, impact will shift. This does not meas crap if you are a hunter that relies on an accurate, single cold bore shot. Much more important changes in environment, station pressure, humidity, wind, slope, quartering shot etc. than starting cartridge temp.
Want to avoid missing that bull in cold temps??? Then you have to get out and shoot in EVERY condition possible from multiple positions. Doesn't matter if you can accurately predict your powder temperature velocity if you can't feel the trigger because your finger is frozen or you have buck fever! THIS training is very difficult especially with 8-5 jobs and hunting conditions that vary greatly from our practice conditions. It is VERY hard to be an accurate long range hunter without practicing in actual field conditions so..., keep your goals/distances realistic, focus on what you can control and realize that your ability to interpret field conditions will likely play more of a role in whether you kill or eat your tag.