hi NorthernSniper
what hand loads have you tried with the 75 ???
have you tried different bullets and powder ????
the reason i ask is i have yet to see a 75 shoot poorly although there is always going to be the odd one.
anyway back to the question. probably one of the smiths are better placed to answer this than me,but i will have a go.
the way i see it is if you have your 75 trued properly and a custom barrel put on and bedded then it will shoot just as good as any custom rifle.
if you sell the rifle you are going to loose x amount of $
and this has to be put in to your calculations.
when or if you come to sell your 75 after you have had all the work done it will still be a 75 and in my opinion will never be worth as much as a custom rifle.
so at the end of the day it all depends on how much you have to put in to this rifle or a new custom rifle.
if i lived in the USA i would 100% have a full blown custom put together by Kirby or one of the other very respectable smiths on hear, as you will know one thing for sure,it will be put together correct and it Will be a shooter, and you will have a rifle that will last you a long time and will not let you down, if you do your part and shoot with in your own capability's, as the rifle will probably out shoot you (no disrespect to you implied)
its just they do build excellent rifles.
if you look at the development Kirby has done with his line of Allen magnums and the results people on this board are getting with them, then i think you will agree that his prices are very reasonable. the same goes for the other well known smiths on hear.if i am thinking of building my self a rifle i look at it as the action is the heart of the rifle,and will always be there, so i try to buy the best i can afford at the time. the barrel is a commodity and will be replaced many times in the rifles life,so any match grade barrel will do for the job. the stock will probably be on for the most of the rifles life as well so i get the best i can afford, or one i really like the looks of but is built to a good standard. then after this i only have to change barrels as and when they give up.
hope this makes sense to you
Colin