CJF:
You might want to do a chamber cast. The rifle could be chambered for one of the .297-230 rounds, which are a centerfire with similar ballistics to the .22 Long Rifle. The cartridge was initially developed as a subcaliber training round for the Martini-Henry rifle, but migrated into rook rifles as well. There were several variations.
I may receive a lecture for this, but I tried out the rifle with 22 Hornet ammo. Accuracy was decent (roughly 1" at 30 yards with a rest and my aging eyes). But extraction was terrible. It seemed the chamber was just a tiny bit tight. Cases were a little hard to chamber, very hard to extract, but retained their shape after firing (and then entered and exited with ease.) I'm wondering if more cleaning and perhaps a polish of the chamber is needed.
Remington40x, I've never cast a chamber. What product and method do you recommend?
