I have an older from maybe late 70's Rem 700 ADL in 7 mm mag. I am not happy with the cycling to unload it and always had issues trying to get the bolt to pickup a round. been wanting to change to the BDL style. Now if I change out the stock and add a trigger and then not satisfied with overall shooting, I assume I am restricted to bbl replacement type since I bought a stock first ? I am not familiar with the diameter of the chamber end of the bbl. Can somebody educate me on bbl & stock purchasing. Thanks