David I am grass green about doing this so it will be a learning experience for me as I go but I have some ideas to explore... This will be months in the making so stay tuned and stay patientIdaRam, You have me thinking about the same possibility now. Bob, post those pics as soon as the rifle is finished......Does the same work for a M70 .375?
Both cartridges are the same length so it ought to work. However there are some model 70's in 300 Rem Ultra mag which is made using the 404 jeff as the parent cartridge... I actually just bought one (pretty cheap even) to try shooting as a long range model... But I have the option of turning it into a 404 jeff if I don't care for the ultra mag. This way the bolt face should be ready to go and the mag box should be fine as is also?
David get back to me in a week or two and I will try to see how well the 404 cartridges fit and may even have prices on re-boring or re-barreling.