Honestly, Nick, I don't recall. I was using Hornady Match brass, a WLR primer and a 150 grain Hornady Interlock bullet to work up a hunting load. I recall looking down the case neck and saw that the powder wasn't going to be compressed as it was below the neck, but above the shoulder. Let's call it 90% or better.
I'm shooting that load in a 1983 model Remington 700 ADL. It's a bone-stock hunting rifle that I haven't done anything to but shoot it. It wears a 3X9 Leupold VX1 scope. It's a standard Fudd hunting rifle.
When I got the powder, I loaded some cartridges at 0.3 grain intervals and found the best accuracy at 51.1 grains, well below max. When I put it over the chronograph, I was startled to see that I was getting 2947 fps from that load. No pressure signs at all. Primers nicely rounded, bolt lifted easy. That rifle has the longest lede in the history of long ledes. When I seat the bullet one caliber into the case neck, it's nowhere near the rifling. If I seat it to touch the rifling, the bullet falls out of the case. Lots of jump on that load.
Yesterday I was tuning up grandkids for the upcoming deer season, having them shoot at 8" paper plates. Not a real small target, but one that approximates a whitetail deer's vitals. I took that rifle and propped my elbows on the hood of the pickup and let three shots fly at one of those plates. Two shots touched and the third opened it up to an inch, centered in the plate.
