Originally Posted by busse fan
I have used rl22 in 7mm rm and 257 wby. I lost 120 and 180fps from summer to -20 hunting temps.
I loose over 100 fps with h 4895 with one combination in my 25 wssm ( I knock off prarie dogs with that load-- summer only). A sticker on the bottle doesn't do much for me I guess. Kinda like stickers on a wanna-be race car on the street-- do they really ad 5 hp per sticker??
Check your loads in both high and low temp ranges and cull the ones that perform poorly. I care about accuracy more than velocity here, but I'm not putting up with a 300 mag getting turned into a '06 by cold weather either.
Make sure you are using enough primer for cold weather. I load dang near everything with a mag primer unless it's rather fast burning, easy to ignite powder in a small case. I don't want ignition or uniformity issues in my loads in cold weather, as I'll be hunting in those temps..
I think the o.p. is also having neck clearance issues or is jamming some of his bullets into the lands a bit to much for easy chambering. I doubt die brand will help unless he clears up his clearance issue.