Originally Posted by jakes10mm
Good info, thank you. I have done some testing with Berger 190 & 210 Hunting VLDs. Shot some Nosler 200 Accubonds this weekend and just received a box of 180 Accubonds for the next range trip. Also trying H1000 powder. My initial work with the Bergers used Reloder 22 and IMR4350. Really like the accuracy and speed from RL22. I've heard some feedback on adverse temperature effects on RL22.
Don't worry so much about rl22 and velocity/pressure changes. If you aren't running right on the edge at below freezing temps. it won't be an issue. I've shot around 1000 rounds of 165 hornady f.b. with 78 rl22 in my browning 300, and the only thing it does is go from just over 3200 fps in zero degree weather to 3280 fps in 100 degree weather. I don't know why the sst's are so bad(and this isn't the first I've heard of this), but I'd whack just about anything with a regular hornady without even blinking. The only ones I've ever cought have hit at 1/4 mile or better and hit heavy bone, and they still held 60% weight or better.
I've worked with h4895 in my 25 wssm with 100 sierras, and it'll swing 140 fps, and it's an "Extreme" powder. Trouble is, the powder manufacturer can't control the primer, case, rifle, or other variables that really will drop your velocity in cold weather. I've had the Oehler out from -20 to 100+ degrees so I've been able to have a few chuckles from creative powder marketing.
That said, I would like to see some data on the newer Hodgdon powders as far as temp stability, as they may be better than a re-engineered powder. Real world, cold weather shooting, not freezer ammo, as all that proves is you can put your ammo in the freezer.
Heck, I should probably get some data together myself; I don't have any ledgers anymore now that I load at my house instead of my Dad's.