new stock if wanting to spend mcmillian or manners i have a bell and carlson i am happy with. Bedding in a new stock would be much better and a timney trigger. Then time behind the gun.
Good advice. I have HS stocks, bedded boyds and other wood stocks, mcmillans, belle and Carlson stocks and they helped improve accuracy. I think the best improvements you can do to a factory gun is:
*Install Timney trigger aprox $125 or have the trigger worked or adjusted
*glass bed and free float barrel-varies if you do it yourself some smiths will do it under $100. The free-floating isn't always the answer some factory guns especially sporters like a pressure point.
*buy a stock that is bedded or has an aluminum bedding block-$200-600.
*reloading experimentation-different bullets, powders, primers, and seating depth.
*Have a gunsmith check crown and re-crown if needed rarely is problem
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The flyers may be a barrel heating or contact issue too. The top 2 groups look like you may be able to improve with seating depth. Some guns like the bullet close to the lans and some like a jump.