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6 grains of 2400 with a 220 grain bullet is almost certainly what got you in trouble. I use 8.0 grains of 2400 behind 208gr Amaxs and thety are subsonic.
I think this is why using a chronograph is so important developing subsonic loads. If the report isn't as quiet as you expect and you keep going lighter it can lead to stuck bullets pretty easily.
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