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Deburring LR Flash Hole

LoanHarvey

I am Harvdog!
Banned !
Minuteman
Apr 24, 2014
620
56
Walla Walla, WA
www.loanharvey.com
Some new Hornady 300 PRC brass arrived today, so I wanted to start prepping some cases. I got out my K&M Precision flash hole deburring tool and the hole in the primer pockets are too small for the cutter to enter. The K&M tool cutter is .0785 according to my IGaging OriginCal. Is it ok to open all this brass up to .0785? Also note my Lyman tool has a cutter diameter of .0795.
Appreciate your input.