I don't have any 30 30 ammo right now ,could you try some and let me know how it works out?My barrel is stamped 223 ,for export reasons only.But it is chambered in 5.56. The only reason I asked this question in the first place was because some body from P&D in Edmonton told me to only use 223 in SU 16 F. That's why I called Keltec to clarify. Also thanks for your input little wolf.