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His testing involved all of the commercially available suppressors (Parker-Hale, Unique, WCG, Manders, etc) at the time. I think he used a Brno bolt-action rifle for testing.

Chaz Forsyth did the research on this some years ago and it appeared in an article somwhere (possibly NZ Guns?).

After re-reading my post I should amend 'increased pressure' to 'maintaining the high pressure for a longer time period' (ie; my earlier reference to the time/pressure curve).

I would agree that there is no significant gain in velocity but tests here in NZ have shown that good suppressors have increased velocity by a few fps in .22 rimfire rifles.

Yes, gas pressure is...

The suppressor traps the gas and generates a much longer time/pressure curve. This shows up in gas-operated semi-autos and causes extraction problems in many of them. There are two solutions. One...