FrogFire7
Well-Known Member
I'd be curious if you loaded to the same velocity you were shooting in the winter, if the loads would shoot the same
Sorry being so lone getting back. Part of it is that your max load and are hot loads to start with. In Mexico-North I worked up a load for my 308NM a great many years ago in the winter there. (if you want to call a winter) Weather changed about 50 degree between times. I had a 165gr Nosler at 3400fps and excellent grouping in the winter time. It got to be in the early summer or June, and The first one round down the tube that that type of powder load, just to see if anything had changed. I below a primer out of my case and had a hell-of-time getting my bolt open. One thing for sure I hadn't done any checking on how powders reacted to temp. A close friend with me that day brought that up. I took 49 out of 50 cases apart back at home. Changed to H4350 and lost a 100fps, but never had a problem after that. I hunt in weather from -20 to 110+.Well it's going to be over 115 degrees today . Yes it may be 65 degrees difference so let's say the change is 1.5 FPS per degree in temperature rise……. That will be 96.5 feet per second and if your at the threshold or upper limit of the charge and pressure let alone accuracy then the cooler is a good idea.