Speaking of temperature sensitive powders

[Lemonaid]

Thanks for the info grayfox. For comparison my case up to the neck of RL 17 is 29.3. Using a Sierra 107MK and the fired unsized case I could only get to 27.7 grains to be under mag length and not into the lands (2.290 touches lands) and not compressed.
As I am shooting a bolt action, I don't have to be concerned with how the burn rate effects port pressures and how it cycles, dwell time and such. RL 17 might fail for semi-autos.