Thread: Winchester subs sonic booming

I have shot these 40gr Winchester subs for quite a while, years but recently they seem to have become noisier and over the last few months I have had a few sonic boom. I have a jw 15 that has an 11" barrel and full over barrel suppressor.
I figure it's happening because of my short barrel, maybe the powder load is calculated for a longer barrel to optimise the speed and my Shorty is letting fly too early, what do you think?
Anyone had their subs sonic boom?


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