Only reason I can think of to alter to .30 Flanged Mag is if you have a double rifle in that calibre and want to set your Ruger up with a 'scope for longer ranges with the same ammo. I have a double rifle drilling in 9.3x74R (over 20ga) which is good for under 3" 8 shot groups at 100 with open sights, but to scope it would be to spoil it, so I am watching out with interest for the No. 1 in 9.3x74R that is supposed to be coming out soon.