Gundog01
The performance of the 9.3x62 & 9.3x74mm are comparable
The capacity of the 9.3x62mm = 76grain H2O
9.3x74mm = 83grain H2O
9.3x64mm = 85grain H2O
So yes the 9.3x74mm will if loaded to the same pressure certainly have an increase in performance over the 9.3x62mm - but as Daryl says the set back would leave a rather ugly gap in your stock to say the least!
If you want more performance step up to the 9.3x64mm, it is a very simple reamer job for the barrel - however being a bit fatter in diameter you will lose 1 cartridge in the magazine & require work to the feed rails etc.
Not to say it can't be done, but not with the original barrel
If you can get one in a Ruger No1 then you will certainly have a performer!
93x64mm