My standard answer is: 1000 rounds for each rifle, handgun, shotgun, regardles of duplication, with 10K rounds of 22LR.
That being said - about 60,000 rounds.
OldmanFCSA = "Oldman" at Fifty Caliber Shooters Association www.fcsa.org
2012 & 2013 FCSA Regional Match Director - Alliance, NE - Spring Match June - Fall Match September 2013 - ALL 50BMG Shooters
FCSA Member & SCSA Member & NRA Member & AMA Member
"Oldage & Treachery will overcome Youth & Skill"