DDouble, if you are right at the top load for your 9.3x74 drop 3 gns of powder before changing over to a magnum primer.
It is a pain in the bum to redo all your loads again, but it will get you by!
I tried with my 9.3x64mm to see if it would improve grouping & it uses AR2209, (very similar to IMR4350) only standard primers were required to set of the charge!
After a load of testing frankly it didn't achieve better grouping, just marginally less powder was used in my rifle so I reverted back to my 'standard' load!
Don't be put off, it may be a better load than you already have - but watch for pressure signs as normal practice