If built after WWII, the bore should be .224. I always used .224's and never had an accuracy or pressure problem. $350? Too high. They were built with a trigger designed for cheap single shot .22's and can't be fixed. You will never get the bedding right. The barrel is held in by a screw pulling down on a barrel band. Its a wonder any of them shoot at all. I've had either 2 or 3 (can't remember) and they were all good shooters. Not bench guns, but good field guns. All would hold well under 1.5", more like 1.25", not less, BUT I live where temperatures and humidity don't fluctuate that much. To collectors, the scope is probably worth well more than the rifle its on.