Barrel Break in

I hesitate to bring this up as I have heard so many pros and cons. But, if anyone would care to chime in on this the input would be appreciated.

I have a Match Grade Machine barrel in 35 Whelen for my Encore ProHunter. This barrel came with instructions for an extensive break in procedure. Wanting to be able to give an honest answer if the barrel did not shoot well and was asked about the break in procedure, I followed instructions to the letter. It required 75 rounds in total with cleaning after so many rounds which varied with the total number fired. This barrel is a fantastic shooter.

I have another barrel coming in next week from Match Grade Machine in 308 Win. I am sure it is going to come with the same brake in recommendation. I fully intend to follow their instructions this time, also. If nothing else it is a great excuse for range time.

I have never followed a particular break in procedure before getting my first MGM barrel. If a rifle shot well out of the box I never gave it a second thought. I have, when confronted with a new rifle that was stubborn out of the box, used a repetitive process of shooting and cleaning that turned the gun into a decent shooter. But nothing as protracted as 75 rounds. I fully believe that MGM would not insist upon this break in procedure just for the heck of it. Again, I will follow their instructions regardless. But, anyone have any thoughts on the matter of breaking in a barrel.