Very much doubt Dan tests his suppressors on a 16inch Magnum Barrel. GW's advice will be based on what is safe for a Magnum GW's suppressor. As for having a barrel under 22inch on a 7mm Mag, why waste powder? A 280, with a 22inch barrel and the lighter and shorter GW's suppressor would fit the bill out to 700y and with much less blow, but still plenty of go.
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