Finally got out to the range. I loaded up 3 test loads with 100g NBT/Retumbo, winchester case, winchester WLR primer, and seated to 3.250". I decided to start at 60.5g, then to 61.5g, and lastly 62.5g. I didn't even shoot the last 2 loads as the 1st load was shooting in the .3's and was moving 3480fps. No excessive pressure signs on the case as far as I can tell. Looks like I found a winner on the first try and to top it off, I was going into somewhat uncharted territory. I will stretch it out to 400 yards next time out and see how it holds up.
Rifle is a rem 700, 24" shilen, leupold 6-18x40 Target.
.311" 3 shots 100 yards