I am thinking of using an ER Shaw kit in either and 308, 260 or 7mm/08. Not sure which as of yet, I have lots of 308 components and will probably go with a 308. My question is the bbl on my current rifle is .74" at the crown at 22" the Shaw standard bbl is .570" at the crown. Will this be and issue? I was just looking for a quick bbl switch. Thanks