Well this is what works for my rifle.
I found out when I got it close to 20 or so years back, it liked the 100gr BT set at 3.250" base to tip. One weekend I was playing around with some other bullets which I had been having a time getting to group and I failed to adjust the seating die, and loaded up 3 rounds. It wasn't until I loaded the next three to verify the group I ad just shot that it dawned on me hat had happened.
Since that day I have had a dummy rounds laying inside the die box with a 100gr BT epoxied into the case so it won't move. I always also verify that reading before checking the die with it as well. Think of it as a standard of sorts.
So nowadays it rally doesn't matter except for the 100gr Sierra Pro Hunter, what bullet I am using as long as I seat it with the die set for the epoxied dummy round.
I shoot the 100's the 110 and the115's, all seated the same way, and it simply lays them one after another into as small a group as I can manage.
This was a group I shot with it a couple of years back, it's only two shots but I know it's on so I don't waste barrel or rounds just to see.
Long Range for the Grandson...