Don't know for sure what the twist rate is for a Mod 52 but most of the 22 rimfires from yesteryear had quite slow twist barrels. 1 in 16 to 1 in 20. Designed for light bullets, 30 to 40 grain lead at slow velocity well below Hornet velocity. Also the 22 rimfire bullet is smaller than 224. It's .222 in diameter, I believe, which is what the barrels will be. Try some light weight bullets. I had a 218 Bee awhile back which had been made up from a small martini action with a Remington or Winchester 22 rimfire bbl. Would spray anything over 45 grs. all over the place. Stay with 45 or 40 gr 223 bullets and see what happens. Work up the load carefully.