ditto with above, but if it was me i would just start new with a new barrel, and chamber to the caliber you really want, since you are trying to load, to your rifle, you are most likely interested in getting the most accurate load you can, and to be honest, model 7 barrels are not the best out there, plus them being shorter, you are losing some velocity too, so range!, you can buy a better barrel( fluted) and have everything blue ptinted to your needs, and still have a light rifle, heck, I would even opt for a better stock too!, I have several model 7's, and most shoot an inch to 1 &1/2 '''s first 3 shots then start to open up with heat!!, have had a couple re barreled to ( hart barrels)22 inchs, and blue printed , and re stocked,( mcmillian, models sevens, and there ultra lite) now they will hold ( or better if I do my part!)5 shots in about 1/2 inch, calibers, 7mm08, .308, 300 RuM, and a .243, they are my favorite hunting rifles for deer, small light and accurate!,
and I have never had any feed problems with my loads either! from factory to reloads,
your above sugestion will be costly, so why not go all the way, and have the best of what you want!