Thank you Wanna. I have since worked up a cast load of 15 grs. of Unique with an open cell foam filler. Bullet is....crap...I forgot exactly, I think 270 or 272 grs. of 50/50 alloy. Quite accurate and surprisingly shoots exactly to the sights at 100 yards. Open sight groups were from 2 inches to 2 1/4 at 100 yards, benched and bagged. I didn't expect that but am grateful. Velocity averaged 1444 fps on a day in the 60's and about 20 fps faster the next time I chronoed the load in 80ish degree temp. I have the numbers out in the shop but am too lazy to go look. AD and SD numbers were in the single digits, that I do remember and I believe the ES was around 20 fps.

I tried IMR-4895, 4064 and 3031 under the cast bullet and velocities got all wonky. They would start at about 1700 fps then jump 200 fps from 1st to second shot. If memory serves me correctly the 3031 load jumped from around 1700 to 1900 then almost 2100. I thought barrel heating and the necks being too tight but not according to the measurements. No pressure signs of any significance on the brass or bolt lift but something is hunky. Still pondering that one. Any ideas anyone?