I've shot them in the 358 Win, 350 Mag, 35 Whelen AI, 30-30, 9.3x62 and .375 H&H....I never had any accuracy issues with them that I recall. What grain bullet were you using in the .350? I had better accuracy with the 200-225 in the .35 cals. The jewell of the bunch was the 190fn in the 30-30! Scary accurate.
