Wantok..
Well ,it looks like your rifle is just ammo sensitive..And perhaps you've got a crappy box of Win factory loads as well..LOL Good to hear it shoots well after giving it another chance.
If you want to investigate it's potential a bit further.
do this realativley easy experiment. Temporarily free float the barrel.
Take the forend off the gun and note the contact areas - three points along the forend hanger. Take a peice of plastic shim stock- (an old plastic credit/ bank card works well) and cut a few small shims to put on those spots. If you are carefull inserting the forend they should stay in place without any adhesive, but it they don't, either rubber contact cemment or tape will help.
Putt the forend back on and you should see the fooend is lifted a bit downward away for the barrel now. It should be pretty much free floated.
Go shoot some groups then to see if your gun likes that better.. It may not shoot marketly tighter groups, but most likely there will be less verticle string after the first few shots.
If it does, I would go back, bed the contact points on the forend with a little epoxy and once that is done carfeully sand out the bedding pad at the tip and add a little clearance all along the barrel.
Who knows? You might have a 1/2" rifle before when it's all over!
One thing is for sure, groups shooting aside, in any wood stocked rifle with a floated barrel is going to maintain it's POI more consistent over time all other things being equal...
