prdator,
Thanks for doing the test and posting the results. I really appreciate you sharing this info with us.

I used to use RL powders almost exclusively. Then I began to hear about the temp sensitivity issues. I swithced to Hodgdon, but have recently started using RL 19 and 22 again. Like you, I really like how they perform. I have always gotten good results with them.

I'm kind of wondering if Alliant didn't change there formulations to make there powders less temp sensitive. I recall seing some data that showed their powders had the widest swing at changing temperatures. Or, like someone else said, maybe it has something to do with the many other variables that come in to play concerning ballistics.

I also appreciate the 6.5x55 test with H4350. I recently changed from RL 19 to H4350 in my Swede. I may have to rethink this change. RL 19 with 120 to 129 gr. bullets has always been freaky accurate in my 6.5x55.

Thanks again,
Steve