Re: .308 Suppressor Recomendation?
A perfect can, weighing nothing, perfectly threaded and aligned, magnificently designed and constructed will cause POI shift. The reason is that such a can will in every instance change the relative velocity of the cartridge and, in most cases, this transtates to a 1-2% increase. That increase at range, will change POI. Parasitic baffle drag, poor expansion chamber location, change in barrel harmonics, increase in heat retention all wait in the wings to make this fact even more so in a poorly designed can.
The issue is not POI shift, it is the consistancy of that shift, the repeatability of that shift. In a good can, that is a known constant, a small constant, properly applied by the operator in the solution. Is minimizing poi shift a good thing, yes, but random minor poi shift can be worse than uniformity in a larger shift.
In the end, most all the cans discussed here are good quality, to find the very best require a constant poi shift and the sound frequency shift that equates to the best perceived suppression...and THAT is rarely found in a dB reading. Some give up 10 ounces for a much quieter can. Some add 6" for a better poi constants, some go as short as possible as their requirements are all within 50 feet and their movement is restricted. When somebody asks "what is the best .308 can?" the answer is, imo, "for what?"