Problem Rifle, accuracy issues

It is nice to be able to find the problem, but for me, once I have redone the Crown and done the bedding, then if the rifle still won't shoot good......I either put a new barrel on or dump the weapon!!

The barrel my be off - center which I feel it maybe. Gosh, I have seen a barrel that had a very nice "bulge" in it and it still shot under a inch at 100yd.
 
A 6 inch group is pretty bad...we are way beyond the usual accuracy tricks here. You have to have something like a severely fouled bore, bad barrel, bad ammo, really bad trigger, bad shooter {dont be offended, I have seen it plenty!!!} Subtle things we do for enhanced accuracy usually yield much less of a benefit than what you need so I think you can forget about the bedding, lapping bolt lugs, .002" off on headspace or a nick at the muzzle crown. Even a factory unadjusted trigger is capable of better than what you got there. Too many out of the box 600's will shoot 1 1/2" groups. If you really want to know send me the gun and some fired cases and I will find it. All it will cost you is return shipping. Can you see copper streaks in the bore with the borescope???
 
I have my father's 222 600, vent rib & plastic trigger guard intact. Very much used, not picky on ammo & shoots fine. I too would look closely at crown (or just go ahead & recut it) and then clean the bore to bare metal & start from there. Have you taken a tight fitting patch & run it slowly through the bore, feeling for any significant changes? Also agree to forget about headspace & bolt lug engagement being the issue- you should be able probably fire a 30-30 round out of it & get better groups.
 
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