It depends on how polished it is to start with and whether or not you have a burr proplem.All so on whether it is a cut ,button rifled [there were some forign barrels that were forged years ago] or invesment cast.
There is also the fact that sabots do not preform the funtion of
"breaking in" a new barrel.
If a barrel has very much burrs or is seriously lacking in polish"firelapping" is often the best answer for that.
If it is a "normal" barrel 35 to 50 rounds with PRB with JB borepaste rubed into the patches will do it.
Some people prefer to use bore sized lead bullets,with polishing compound or even with out.
First run a cotten ball down the barrel if it snags off bit of cotten you have burrs.
second try some loads see if it acts like it wants to group if it does stay with it, it is best not to do any type of lapping or breakin unless it is needed.Lee