Oops! Almost forgot about the minimum caliber for Kudu which with the current legislation would be 270 or 7mm! This will exclude some excellent caliber's, the Kudu would not know the difference by the way, but it is the law. So all the 6.5 mm cartridges would be illegal. (c) .270 or 7mm rifle for the hunting of- (i) furred game larger than springbuck, up to and including eland, but excluding dangerous game or giraffe; and Have a look at below thread: https://www.africahunting.com/threads/sa-east-cape-kudu-min-legal-caliber.8947/#post-364130 The whole document can be viewed here: https://www.environment.gov.za/site...tices/nemba_huntingindustry_g32798gen1614.pdf As for the 7mm RM vs 7x64mm, the Rem mag burns a lot more powder, has more recoil and is not ideal or needed for the smaller species up to Kudu. The 7 x 64mm is a very efficient cartridge and more than capable to do what you need. Ammo will also be cheaper here in SA.