• Winner! Quick Shot Challenge: What’s the dumbest shooting myth you’ve heard?

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tight chamber?

Call the smith and let them know the virgin brass is a hard extract. Maybe their reamer is a bit small from many uses which is causing a tight chamber.
This is good advice but it is doubtful that a gunsmith is going to admit his reamer is crap and volunteer to chamber a new barrel for you at his expense unless it is a GAP rifle. George Farmer would fix it.

The 22GT is not a recognized SAAMI cartridge and reamers and headspace gauges for this cartridge are not as readily available as say for a 308. GAP worked with PTG to build their initial reamer for the 22GT. PTG or GAP may have a headspace gauge for the 22GT. Since the 22GT is based on the 6mm GT necked down to 22cal, a 6 mm GT headspace gauge will work for checking your rifle headspace and they are easier to find. I would get a good 6mm GT headspace go-gauge and make sure your chamber is in spec.

This is what you need (make sure it’s a go-gauge):