Quote Originally Posted by bootsmcguire View Post
Criterion varmint should do nicely. The Criterion I have is a real shooter and has a nice smooth bore that cleans very easily. that's my preference.

You will need a "Barrel Nut Wrench" no matter what. You can either get the action wrench, or the vice inserts and a vice, or both. Many people will use the action wrench and secure the wrench block in their vice. As for vice inserts I just use a couple of chunks of pine 2x4.

As to the NSS heavy duty ground lug and NSS trued nut, if you are getting one you really should get both as they work together to ensure a nice true engagement to the action. I recommend getting both.

As to a gauge, if this is your first barrel swap, get a go-gauge for your caliber. Then add a pc or 2 of scotch tape to the base of the gauge to create a no-go gauge. There are several threads here discussing this technique and some youtube videos showing step by step barrel swaps.

Hope some of that helps.
Ditto!!! Definitely go with both nut and lug.