Yup and it's something I'm guilty of plenty
The benefits of a heavier bullet even if a little slower is that they usually have better bc so better in wind, less drop and usually carry more energy down range.
I've done a lot of practice at longer ranges and with a solid rest in good conditions 300-400m is a gift to me, but it takes practice and consistency (load and shooting form).
My current rem mag load is a 166gn pill doing 3018fps it's way more than enough at 600y, however even using the right bullet, if shot placement is poor ft/lbs and velocity won't make up for it.
Sorry not trying to sound preachy
I'd seriously look at a 160ish gn pill in front of some 2217 you can go heavier sure but you run the risk of not being in the optimum stability node for the twist rate of your barrel, sure you can work up loads with heavier pills that shoot mint at 100y but how do the shoot at 400y or 500 or even 700y.
That's why I chose to stay lighter with my rem mag even though plenty of people are getting good results with 180gn pills.
You may have a hard time getting heavier pills to shoot consistently. Especially with pills like the LRAB that are known to be fussy.
My 2 cents anyway....
On your comment about groups shifting that sounds more like a bedding or binding issue, but yeah that could be a whole other canmof worms. Maybe before blowing through pointless components it would be worth getting a smith to give the rifle a thorough going over ? Bore scope, check bedding, check for binding etc etc, it might cost ya $100ish but how much $$$ in components have you blown through to be no further ahead ?
Good luck
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