Chris,
I understand exactly what is going on and had the same experience myself. I even got a VVGC Lone Wolf fiberglass stock, pillar bedded and completely floated....read as much as possible with an Encore..... Never had enough confidence to switch from one barrel to another during season. NEVER!!! Did find out that a floated/stable forend helped as well as an oversized hinge pin but it did not help to restore 100% confidence that I require.
This is all past tense as I have now sold ALL Encore stuiff I had. Multiple VVGC barrels with scopes, 50cal MZLDR with scope, Lone Wolf stock, and frame are all gone.
I had the same original thought as you...one frame with many barrels, think of all the calibers I can have. I then found out that changing barrels during the season was not going to work. Pretty much like having one rifle. All of this was after perfecting loads and loading techniques, spending MUCH time shooting...often getting GREAT groups! But I am, as we speak, having a BOLT gun built from the $$$$ from my Encore.
My advice is play with it...you have already shot it. Tweek it as you may and hopefully you find a combination that is up to snuff for you. Or use it as a one fram per barrel setup. Frames can be had for about the price of a new barrel.
Good Luck,
Kyle