- Tue May 09, 2017 4:11 pm
Well guys, I finally got er done. The following pictures will show finished product and some shooting results after testing many loads. I learned several things about the little round which I'll expound on in some detail.
The reamer I was sent and used turned out to be a "match" reamer and was very tight. I first started with factory 22TCM 9r. They all chambered easily and fired with no problem. Every one of them caused the bolt to be very difficult to open and extract the brass. My reloads, which were trimmed to the same length as factory, also jammed. A close examination of the brass indicated a shiny spot on the end of the necks of almost all pieces of fired brass. OAL of the factory cartridge drawing show the measurement of 1.025. The chamber reamer cut the chamber to 1.031 OAL. The fired brass was measuring 1.031 to 1.035. Back to the drawing board. Also, I've sent the reamer back to PTG for a redo. I did not order a "match" reamer. I'll rechamber when I get a better reamer.
I trimmed all my new brass back to 1.015. That eliminated the jamming problem. After firing, the brass OAL measured 1.021/ 1.023. Obviously there is a lot of stretching going on with the fired rounds. I would recommend all reloaded brass should be trimmed back to at least 1.020.
I moly coat all bullets i shoot in all my rifles. In the TCM, I'm shooting 36 grain Barnes Varmint Grenades. They are not match quality, but as the pictures show, they do fairly well ar 100 yards. As an aside, they do under an inch at 200 yards. Definitely minute of squirrel. I'm using Lil' Gun. I started at 10.0 gr and worked up to 12.4 in .3 gr intervals. As yet I haven't gone any higher than 12.4. The crono'ed velocities are very respectable for such a small round and so little powder. Using factory AP brass with WSR primers, 12.1 grains gave a velocity of 3285/3242 fps. 12.4 = 3328/3296 fps.
I purchased 300 rounds of LC brass from Sleeping Giant. In my tight chamber it won't go in. The brass is about .003 larger in diameter at the neck and requires turning down to .015 wall thickness.
I'm still testing those loads. With a new reamer, I won't need to turn neck so much.
You'll notice a new bolt handle on the rifle. Much better than stock.
Everyone has a right to do stupid things. Unfortunately, politicians tend to abuse the privilege.