Yeah, I just don't want to work up a max load that is extremely accurate now, and then when the temp warms up have to change because of high pressures lol. I'm using Varget, and it temp insensitive to a point, but it does change POI (which in turn is velocity and that = pressure change) in colder weather, and I've proved that with the 22-250.
Thanks again for your help.
By the way I'm just fiddlin' with the 220 to see what it can do, not super serious about it lol. At least I'm tryin' not to be... Here's my baby, 22-250 Rem and a sample of groups. 2 of the groups include cold bore. And I'm still playin' with this.