mcgowan vs pac nor barrels

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So if i were to go with one of these nicer barrels how much improvement in accuracy should i expect over a stock remington varmint barrel?!?!

Well, your question is dependent on more than just the barrel, such as who is building the rifle for you? What are the other components? etc.

That said, there is, in my opinion, a truly remarkable difference in a custom barrel by a top tier company v. a factory Remington barrel.

I do not own and will not shoot a rifle that is factory. Just my preference.

I agree!

[ame=http://www.youtube.com/watch?v=hf9zZqn00CA]Lilja BoreScope Video - YouTube[/ame]

I have a 30" Lilja 3-groove 1:8 in my .270 AI and am very pleased with it.