Re: 2 rounds touching 3rd one 1 away everytime what to do?
I was also thinking seating depth? If you haven't played with it yet, definately do.
Had a hel of a time getting a guys sendero 25-06 to shoot with 115g nbt's and retumbo just recently. It would do 2 in and 1 out everytime with just about any charge. I finally made up a batch of loads with about 7 different lengths in .015" increments and finally found a decent sweet spot about .090" off the lands. Gave me a 3 shot .3" group. Duplicated it the next time out and sighted it in for the guy, good to go. This is one of the very few rifles that I've worked with that didnt like to be seated out close to the lands. I could tell it wanted to shoot by putting 2 touching or within 1/2", but it would fling the 3rd one 3/4"-1" everytime. I decided that the seating depth was the culprit and that needed to be addressed moreso then powder charge.
Thin barrels also have a reputation for doing this. Try waiting longer inbetween shots say 3-5 minutes. For a hunting rifle, its better to have the first 2 be good and to fling the 3rd, then to have your 1st CB shot be way off, and your next 2 be on, if that makes sense. However its always better to have all 3 go where you want them to!