Just shoot it 
Ive only tried breaking in one barrel and i didnt notice any difference.
On my 300wm i just started workin on a load from the get go, factory savage 112 barrel and its a real shooter.
Ive only tried breaking in one barrel and i didnt notice any difference.
On my 300wm i just started workin on a load from the get go, factory savage 112 barrel and its a real shooter.