OK...life is getting better, my Triumph isn't a tomato stake it appears to be fickle.
I thought about it for awhile and measured up some more Blackhorn 209 loads.
75 grains, 85 grains, and a couple 90 grains. (weighed not volume)
After digging around in my containers I found some Barnes 250 grain boattail blue tip with yellow sabots. I discounted them earlier because they measured 0.504" in diameter and I didn't think I could get them down the barrel. Also they didn't shoot worth beans in my Knight ML's so I wasn't too excited about them.
Group 1 (50 yards)
Barnes 250 TMZ blue tip with HPH-12 sabot
90 grains of Blackhorn
Federal 209A primers
Average Velocity 2162 fps
Measured 1.6" c-t-c
Group 2 (50 yards)
285 Barnes Spitfire with HPH-12 sabot
85 grains of Blackhorn
Federal 209A primers
Measured 2" c-t-c
Because these were loading up so well I thought I would try loading up the 250 grain with the yellow sabot that measured 0.504" in diameter.
Group 3 (50 yards)
Barnes 250 TMZ blue tip with yellow sabot
90 grains of Blackhorn
Federal 209A primers
Measured
0.75" c-t-c (We are moving in the right direction)
Group 4 (50 yards)
Barnes 250 TMZ blue tip with yellow sabot
75 grains of Blackhorn
Federal 209A primers
Measured
0.50" c-t-c (Now I'm a happy camper)
My chony took a crap on me after the first group so I don't have velocities for the other three groups.
Anyway, I'm happy again and I'll try the remaining 250 boattail's out at 100 yards and report back.