In regard to factory rifles I've done it both ways, breaking in rifles with the tedious methods and not breaking them in at all (except for just going out and shooting them, which eventually does something I suppose).Breaking in rifles hashad absolutely zero effect on my ability to take game, so I don't bother any more with it. I hated doing it anyway.

When I rebarreled one of my rifles recently with a Lilja barrel I was prepared to do what Lilja recommends, but the folks who installed it, Hill Country Rifles, had already done a 10 shot break in before shipping it back to me. I'm thankful I didn't have to bother with it.