Originally Posted by Black67
Have you tried to shoot your Laredo without the BOSS attached? I am wondering if this would give you a starting point, then work to that. I would start at the most open setting, so that the BOSS had the least affect on the gun, then work to the tightest possible before you see the groups open up.
I have a Laredo without the BOSS, and the gun shoots a 1/2" group with factory ammo that is 10 years old.
Way, waaay back I bought a brand new model 70 7mm STW with a boss. It made me nuts trying to figure out how to tune the boss. Talked to a good friend/gunsmith who told me find a load it shoots well without the boss, then put the boss back on and dial it in one turn at a time till the groups tightened up. Once there turn it 1/4 turn at a time until hitting the sweet spot.
My solution was to put a good brake on it instead of the boss and it shot the hell out of Winchester factory 140gr ballistic silvertips in the Winchester supreme line. Once I had a couple of hundred rounds of that great Winchester brass I started handloading the 139gr Hornady Interbonds for it with H870 and it shot lights out for me for over a decade at which time it left with my Ex who was in love with shooting it.