I managed to get out to shoot some of my subsonic cast reloads today with some interesting results. The photo is of one captured in a milk bottle line up, from inside the 5th (2L) milk bottle. Speed 1120fps(just supersonic), 7.5 gr Trailboss, expanded to .453 dia., shed weight from 151gr to 97.3 gr
Todays Results: (all Trail boss @50M, COAL 2.450, Ave speed of 3 shot groups, 1.5-4x Leupold scope set@ 4x, dark marlin 30-30 DPT suppressor)
6.5gr 1042 fps, 50mm group
6.8gr 1070 fps, 35mm group
7.0gr 1098 fps ( one round supersonic) 50 mm group
7.5gr 1143 fps (all supersonic) 25mm group
Also shop a group of the longer rounds mentioned earlier that jammed into the lands somewhat COAL 2.500, 7.0 gr TB ave speed 1084, group size 50 mm. Effectively slightly slower, which was a bit unexpected as I would have thought there might have been a pressure increase.
Grouping was a bit average really but might be requiring some more work on my part and I wasn't set up on my normal(better) spot. I might play a bit more with those loaded at 6.5-6.8gr to see if I can improve accuracy. Interesting to compare with jacketed loads shot last week ( berry bullets 150 gr) which when loaded at 7.5gr TB were consistantly subsonic(ave 1060fps).
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