The regular 22 TCM cartridge is listed at being 1.265 inches for its max COAL. I think that the factory ammo is using 1.247 for the COAL though.
With the 22TCM 9R cartridges, I got a minimum OAL of 1.1415 inches and a maximum OAL of 1.1470 inches. Most were around 1.1450 inches though.
With the 22TCM regular cartridges, I got a OAL from 1.2515 to 1.2520 inches.
Pics showing the OAL for the 22TCM 9R factory rounds that I have:
now then here are pics for the regular 22 TCM cartridge OAL
This cartridge is my white whale! Not only does every different bullet and boo lit require a significant load ladder, but each design is a new adventure in loading technique.
So far I've worked up original TCM factory, some pulled 22 mag, and some NOE 37 HITEK & PC/GC boolitz. The pulled 22mag looked promising but is cost prohibitive as I couldn't find an open source for bulk purchases. The NOE 37's were ok with either coating but only in loads b/w 8.5-9ish of H110. The few I prepared below 8.5 just would not cycle right.
Then there is this 9r projectile. Strange looking bugger that wants to squish / deform with too much pressure during seating. Unusually deep seating depth but a shape that makes sense for the application.
I keep hoping one of the swaging guys will come out with a hornet like solid copper pill that will revive the interest in this cartridge. I'm definitely concerned that this one will die if the current mfg doesn't release the cartridge for SAMMI specs so other manufacturers can take a swing at it.
Now then a lot of guys are having pretty good success with powder coating their lead bullets. So maybe that is the way to go. One can get a lead bullet mold and bullet sizer and have at it then too.
Oh yeah, one could buy copper rods and use a lathe to machine bullets. It is a bit painstaking to do, but doable though.
There are some companies making solid copper bullets in .224 caliber too. This one referenced makes 32 grain and 40 grain bullets besides others as well. ref https://cuttingedgebullets.com/shop/cut ... caliber=35