I'm not getting into why or why not a certain powder is temp. stable or why (or why not) you should confirm your sights before you go afield. There is more to temp. stability than a sticker on the bottle though. The powder can't control any other aspect of your system, from the barrel to the stock to the shooter. Repeatable accuracy is paramount.
I will say I'm rather impressed with rl33 so far but my brother has the oehler squirreled away in his garage at present ( and I don't trust my CED much farther than I can throw it) so I can't really confirm uniformity, etc.. I've shot groups in multiple days at 100 and 200 yards so far and my 300 rum is doing right at .6 moa with the 225 hdy with 95 gr. rl33, rem brass, and a 215. The conditions haven't been perfect either, with gusty winds the norm..
Rl17, 33, and 50 are made by Nitrochemme, not Norma as the other rl powders are and they are doing some things differently chemically than a normal double base so I doubt any Norma made rl powder will compare directly. I haven't had trouble with rl 22 and 25. I've done most of my longer kills with either rl22 or 25 and the critters didn't write me letters of protest from the back of my pickup.