Thread: .22TCM Micro Varmint rifle build

Before grouping I wanted to address the brass necks a little more. The Armcor Precision co brass was fairly roughly cut on the case mouth and lengths varied quit a bit which wasnt helping when trying to seat flat based projectiles concentrically. One in three loads had a wobble when rolled on a flat surface.

So I quickly spun up a case OAL pilot for a lee cutter to cut all the brass to the same length and square them up. A quick case harden and I put it to work. they were then all followed up with a chamfering tool and they look and load way better.









I loaded 5 rounds (all now concentric) with 13gr of H110 and headed out in the sunshine on the bench.





I bore sighted it on an object at 50y then put 5 on paper at 100y. They hit 5" high of the bore sight so not bad
The group shows real potential but the deviation/extreme spread was pretty crap.

FPS= 3076, 3111, 3106, 3164, 3111

Now this could be the primer, powder or just the variation in the new brass and may get better after fire forming. Still it has given me a benchmark to tune from.



The two separated point of impacts could have been me with a 7X mag scope, but Im willing to bet its one or more of the things I just mentioned or the fact the barrel doesnt quite have enough clearance at the front of the fore end. I could feel it knocking when I moved it on the bipod and separate group clusters like that often point at bedding. Ill need to run a few more groups to figure that one out.
All excuses aside its a 3/4" group CTC and Ill take it..



I didnt want to inlet the stock any more as it was set up for my trueflight barrel on the 6.5 grendel and this is only a test barrel at this stage. I might have to give it a slight skim down in the lathe to give it a touch more clearance.

Ill fit a 10X scope to it tonight too and shoot off my front and rear bags in future for potentially better accuracy results.