This is incorrect. I toured the Thunderbeast factory and discussed cans at length with the tech who gave the tour. I also shoot the breeze with Zak Smith (Thunderbeast owner) at precision rifle matches. Through a lot of testing, Thunderbeast has determined that there is an imperceptible difference in noise for using a larger-hole can on a smaller-bore rifle.
I have a TBAC Ultra-9 with a 308 bore, and I use it for both my 308 and 6.5 bolt action rifles. I have also attached it to 6mm bore rifles. The Ultra-9 does a great job suppressing all of them. My Ultra-9 has a direct thread attachment. I have a TBAC 223 can which is direct thread.
I have a Surefire SOCOM 308 can which I use on AR-15s -- both 223 and 300blk uppers. It does just fine with either bore and it suppresses noise equally well with the different bores. My SOCOM can is QD, and I have either brakes or flash hiders on the rifles that use the SOCOM. The QD works well.
Zak Smith originally stated that precision rifles should have the direct thread for repeatability. This past year he stated TBAC now has a QD mount that is repeatable as direct thread. I can't speak for the repeatability of other QD mounts. However, the SOCOM QD mount seems to be very consistent, especially with all the movement I do with it between rifles.
I've never had issues removing any of my 3 cans when hot, cold, or anywhere in between. Understand that cans get a lot hotter than your barrel, therefore always have a thick glove handy when shooting with cans.
I use my 30 cal can on various rifles, while I cant say if there is a differnce between the same can in a 5.56 only version, I cna say that I can tell a differnce when shooting 5.56 through a 30 cal can with and without a 30 cal end cap. At my ear,(which is what matters to me) a 30 cal can with .224 end cap is quieter thant the same can with .30 end cap. Same is true for my GhostM when shooting on 9mm. Quiter with 9mm end cap thatn with the .45 end cap.
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