As always the answer is 'it depends' Does he want to make it a little easier to carry with a suppressor on as a general purpose hunting rifle, or does he feel the need to chop it super short in the bushpig style?
I cut mine to 20 inches so when combined with a 4" forward suppressor it handles nicely. Once you start chopping a cartridge like the Creedmoor below 20" the fps lost per inch of barrel goes up very quickly.
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