I've got a 30-30 factory 21 inch barrel that wouldn't group well at all, sent it it out for rechamber to 30-40 Krag and a crown job and now it's a tack driver. 30-30 AI is good, but maybe Krag is better...the Krag cleans up the factory throat and lead, you are stuck with the factory throat with the AI :eek:
regards,
Graycg