coyotehunter4
Plinker
CH,
Have you run those through a chronograph, by any chance? The reason I ask is that QL is showing you're leaving a fair bit of velocity on the table, versus a slightly faster-burning powder, like RL10X or H322. Something along the lines of 200fps. less than the ~2200 you could get with a faster powder.
The 4064 load is definitely safe and if the accuracy is great, that is what matter the most, obviously. Still, if you could get the same solid groups with a substantial increase in speed, that would be pretty cool, as well. Consider running some test loads with a MAX charge of 33.5gr RL10X, or a MAX charge of 36gr H322. Back both of those off 10% for starting loads.
I know I am down on velocity, but they stabilized really well out of my Marlin. I was planning on doing some more testing after the season just haven't had a chance yet. Thanks for the info I will make a note of it.