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77 gr bullets for ar15 maybe something to do with twists . I gave my Colt HBar 20" 223 lower with a 5.56 1/7 twist ,to my Son-in-law , your bolt action with a 1/12 twist , that bullet my be alittle too heavy . AR's may require a heavier starting load do to being a semi . Bolt action can use a lower starting load . I'm just giving you reasons why they said the 77 was for the AR .1/7 1/9 twist can't see and reason why they wouldn't be for a bolt . Could try a lighter bullet , haven't loaded 223 in awhile 62 or 69 grain , there is a formula for twist and bullet weight you can look up , may be helpful
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