Gentlemen, I think most here are giving the answers to two questions, one that was asked,and one that wasn't asked! IMO, the question he is asking is the amount of conversion of the barrels for a starting point for the physical regulation to be done with the least amount of correction! The other answer is being given is in regard to working up a load after the regulation is done! These are two distinctly different things! "REGULATION" is the physical manipulation of the barrel's conversion to shoot a known load correctly! While "WORKING UP A LOAD" which is mistakenly called "REGULATING" is finding a load the will shoot to the regulation of a finished rifle!

In this case, I think the poster is asking about Physically regulating the barrels. For a starting point for this opperation, one first needs to know the chambering to be used in this rifle. Because the weight, and recoil generated will have great effect on the first setting!

Once we have that the answers can be offered!