Guys---- I hope u can help me--have (2) 303's and bullets tumble badly--I have sluged bore --- did not get a good measurement but from what i can tell it seems (big) have tried 312 GC bullets and 313 GC and 314 GC lubed with felix lube---The bore has to be larger than 314---only time I saw them start to fly right is after about 10 rounds and with a light load. Has anyone had luck with fillers for this type of situation (bore being large) was told that a filler like (cream of wheat) could help the gases from escaping past the bullet can anyone help with this problem----Jacketed bullets of 311 dia. shoot fine just recieved some 170 gr 312 jacketed---cant wait to try them---rifle is clean and bore shines--but the lands seem to be scored runing with the land itself. rifle is a P-14 and the other is a smily. mark-3--- the 2 bullets I tried where 180s and 214s--180s sized 312 and 313---214s sized 314 ---bullets are hard----