I would say you are done. That is exactly the same load I worked up for my sons Colt Light/NULA and It took less than 20 rounds to get there. I got lucky and arbitrarily seated to the cannelure and it worked out fine. Same velocity and group size as yours pretty much. I think it could take 200 more loads to get much if any improvement on what I already have so will load and go with these. Good to hear that you like the Hornies for big bodied deer as I hope these will be on the agenda for next season. With Mule deer, Axis and one place that has verified 200+ lb field dressed Tx. white tails we will be ready. I used the 270s little brother the 6.5x55 with 129 Hornadays and R26 last year and it worked exceptionally well.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli