Don't be afraid of Small Base Dies
I was in the same boat. Reloading for my Dad's 760, in this case a .308.
I while ago I thought I should develop a load for Dad's gun. Since it would be for hunting only I decided to get a set of small base dies to ensure reliable functioning. I got a set used from the EE.
I picked up his gun and took it home. I noticed it was looking a bit tired these days with lots of scratches and dents in the stocks. I still remember when it was new, likely 20 or more years ago. I decided to give it a good cleaning and took it all apart. Then I decided to refinish the stocks.
Before refinishing the stocks I decided that the absolutely heinous stamped-in checkering was not acceptable so I used a checkering tool and recut it into real checkering. I did 10 or so coats of Tru-Oil and then a rubdown with pumice for a nice satin finish.
While reassembling it I just couldn't put the cloudy Tasco 2-7 and the tip off mount back on, so, back to the EE and in the mail I get a nice Leupold 2-7 and a solid weaver base. I already had the Millet rings in my 'ring stash'.
So, back to the topic of this thread (sorry). I had some Varget and Re 15 on hand so I flipped a coin and started with Re 15 and 165 Ballistic Tips. I had bought 100 Norma brass (once fired) at the gun show. I used the small base dies. I just loaded five to confirm the bore sighting and just shoot a group. The first shot was fairly close to center so I didn't adjust the scope and fired the remaining four.
Here's the first 5 shot group I fired:
It measures .8xx" and that shot out to the left was from the clean barrel. I'm not the least bit concerned about small base dies and sacrificing accuracy anymore.
This load became 'the load'. I fired two more groups: one was under .8" and the other was just under 1". (All at 100 yards). I felt no need to 'develop' any further. These 760's can shoot.
So, I wouldn't use neck sized ammo for a hunting situation but it would be fine for casual use so go ahead and load some for him and see how they work.
Here are some gratuitous pics of the rifle after the cleanup. I didn't think to take any 'before' photos because this little project just sort of 'happened'.
When I gave the rifle back to Dad I just gave it to him in a case along with a box of 50 loaded rounds without telling him what I had done. I was glad when he noticed the difference right away when he opened the case....