May get my hands on some of both of these powders. Curious how temperature sensitive these two powders are.

Has anyone loaded and tested using either one in say, 50 degree weather and then shot at game in say, 15 degree weather out to oh, 300 yards?

Any significant velocity drop?

Pud

Well, I did some more Google Fu and did rustle up an article MD wrote back in 2017 called Rifle Powder Temperature Sensitivity.

In the article MD logged data for RL-22, which IIRC is equivalent to Norma's MRP, and joy of joys he also logged data for Norma 204. At least I think it's 204. It's referenced as N-204 anyways.

In any case, if I can read the data correctly, the N-204 didn't have a POI change due to a extreme temperature change.

So, the result of all this is I'm gonna swap the old feller's (who's headed for a retirement community) Norma powders for some backstrap and stew meat.

Happy handloading

I use a good bit of urp and ive not found it to be temp sensitive. I shoot a lot in summertime, 75-80 degrees and shoot the same loads in hunting season, which can get down into the single digits.