Re: Viht N560 vs RL22
Burn rates between the RL-22 and our N560 are very similar, with the N560 being just slightly faster. Excellent powder for the 270 Win, too. I think you'll find the V-V powder to be somewhat cleaner than the RL-22, but the issues of accuracy and velocity will need to be determined by you, in your particular rifle. Hey, they all have their own preferences.
As far as the consistency and temperature sensitivity questions are concerned, I think you'll like the N560. Very stable stuff.