Just my 0.02c$!
In my humble opinion if you guys re-read his primary message and his question you guys will find out that he "just found a good load" that group under 1" but he "Didn't" chronograph or work out drops yet for the load.
My answer to his question in my understand:
If you have a good load with your 22.5" barrel you are very likely to keep the accuracy of the load with the shorter barrel. As soon you ad a suppressor/can what is very likely to happen is, your load still will group well but your point of impact may change slightly.
That said, you still have a "50/50"% chance you may need a "tuick" in your load, but not a full "rework" load.
I hope it helps.
Cheers.
Mac
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