You and I need to get together and go bowling--I was at Garland public this weekend fighting a can. I have a similar problem with my new Suppresor--no one has alignment rods and everyone just looks at me funny. (Dead Air)
Anyway definitly a pro tip on those rods--rather than those expensive ones you can get high quality (albeit LONG) steel rods at https://www.mcmaster.com/ (or the above site--its the sizes that are important)
I even emailed myself the stuff from work based on searches here.
.2031" - P/N 8893K187 - Good general purpose rod for 22 caliber suppressor alignment - should work well for distinctly undersized match .22LR bores (think CZ452/455 at .210-.212" bore diameter), but otherwise may be a slightly loose fit;
.212" - P/N 8893K191 - Better fit for many standard 22 caliber bores (.22LR at .217" bore diameter, .223/5.56 at .219" bore diameter, etc.)
.250" - P/N 8893k204 - Good fit for 6.5mm Creedmoor/Grendel bores (.256" bore diameter);
.295" - P/N 8893K217 - Good fit for 7.62x39, .308, 300BLK and most Western 30 caliber bores (.300" bore diameter)
8893K219- works .300 blk/ .308 - tiny, tiny bit of play- works perfect
.339" - P/N 8893K229 - Good fit for 9mm (.346" bore diameter)
8893K231- works 9mm- small amount of play but still works just fine
.4219" - P/N 8893K252 - Slightly looser fit for .45 ACP (.442" bore diameter). Stepping up to a .4375" rod (P/N 8893K254) may generally work, but could be too tight for rare cases.
338 < .330 (based on .338 - 2 * .004 for the lands).
I felt like such an ass when I couldnt get mine working and was having trouble. And everyone else is like "its just barrel harmonics" or "you have bad trigger pull" or "your resting the barrel on something"