Sighting in my mauser 35 whelen AI I just built. I have been a shotgun guy all my life, just getting into rifles. First 2 groups of 3 clustered nicely. Had some vertical rising (stringing) on next 9 shells. The barrel is free floated. It was hot and I did not let the barrel cool much.

I thought vertical stringing only occurred with barrels that are not floated. True or false.

It could be me. I am an amateur from a rest. I was using a shooters ridge rest with 50# of shot. the front is not perfectly stable I need to apply firm pressure on the gun to keep it on target.

Could I have just missed?

Could I have push down on the gun enough to contact the barrel before firing or while bullet was in barrel?

Or maybe during recoil, I let the gun loose before the bullet left the barrel.

Note: it was about 100 degrees at time of shooting and barrel was not perfectly clean either.

I know this is a bit off topic, but I like the advice I get here and am proud of my first mauser sporter I built from scratch. I was inspired by the stuff I read here

Thanks

Jerry