carp

The rifle will probably shoot with 286 grain bullets. Is that what you have?

If so shoot two from each barrel at a range you can see accurately with the open sights.

What do you have?

A chronograph is handy as the rifle should be shooting around 2350 with factory ammo.

If the bullets are apart than increase the velocity if crossing, decrease it. It is not a bolt rifle so don't worry about hot rodding it. Just use a velocity that allows it to shoot as well as it can.

If they are apart vertically make sure you are resting the rifle on your hand and not on anything hard.

For bases try Rolf Martini in Cranbrook