I have one in .308 and it likes the Remington Core-Lokt bullets the best, in 150 grain.

I have a old 788 in 6mm Rem. Its accuracy was so-so after doing a lot of work and trying a lot of different hand-loads. I had the barrel re-crowed(target crowed how ever you say it) and it made a good bit of difference and didn't cost an arm and leg.

Also if you stock is in so-so shape like mine is boyd brothers are offering new laminate stocks for them around $100. Seemed like a very good deal.

I have one in .308 pretty accurate gun, with that said the fault of this rifle and others like it is a thin barrell which will heat up on you quick. Mine has a good stock for a gun I got used in 1986. The stocks are soft and get bent places on the wood easily. I put a timney trigger on mine helped a bunch the trigger had terrible creep. After that the factory stock was tight on trigger assembly (soft wood = easy custom fit with sand paper and restain.
I would check if your bullets walk as barrell heats up if it does may be hitting stock also how does your rifling look do a good cleaning for lead and copper fouling. I used windex then cleaned as normal. Hope this helps
chris

My rem 700 vls 243 loves the 100gr remington core lokt, iv tryed alot and these where the ones with the tighter groups

and I have 3 all in 22/250. and they will go only when I do.