I settled on 34.5 grains of powder, and my 336 is also sub-moa.
used this load for my 73 year old sister to kill her moose. one shot 50yrds drt. went in the front of right shoulder, severed the jugular and blew the plumbing off the top of the heart. oil pressure 0 drt. used the flextip in 45-70 on my last two elk. all one shot, 10 to 15 yds run after hit. really like them for tube feeds.