I would not use either on a barrel that is performing well, but I HAVE turned several poor performing barrels into good ones with the NECO kit. I have not tried the Tubbs system but plan to when I am out of NECO bore lapping compound. The concept and idea is sound, proven many times over by myself, Mr. tubbs and MANY other experienced shooters. Like many products careful and proper use can be a good thing, overuse not so much. Nothing wrong with moving a throat forward in some cases, either. Adjust the load and fire away.

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About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500