Starting on my new build for the spring time 600 yd shoots.

I want to convert this 308 win into 6mm Creedmoor.

Looking at swapping out the barrel with a heavy profile barrel.

My concern at this time is the receiver lug. My model 12 with varmit barrel has the lug on the receiver.

The Axis is not attached. I will be using a Boyds AT-0ne stock and will want to bed the receiver into the stock.

What would be the best what to secure the lug to the receiver before bedding and to keep the bedding material from getting into the barrel threads?

If someone has done this I could use some pointers here.

Thanks for you help.