IF you must lol. I load lots of Creedmoor but none with the powders you have listed. I use W760 and I am running a test on Tuesday with reloader 26. There is a whole thread on reloader 26 with the 6.5 creed. You also shouldn't have any issue getting info on H4350. I bought a ton of H4350 for my creed rifles but was pleased with the results from W760 so I never changed. Any way good luck and be safe.can I shoot it first?
JM: thanks for info, might start with h4895. ChasI am wondering about the powder, since the original M-14 was designed for IMR4895, H4895, etc speed powder. You will damage a M1-A (M-14) in .308 Win (7.62x51) using a powder as slow as IMR4350 or H4350. I would be curious if this is also true for this rifle.
Remember that bolt is moving milliseconds after the trigger is pulled. One of the reasons that the M-14, M1-A is so tough on brass.