I’m kind of liking that 6GT. Screw a Shilen prefit in is easy enough. Less of a barrel burner than the 243, less recoil. Feeds better than the 6BR. Could it be a beginners cartridge?Well if you take a 6BR, add 10 grains of powder and the extra recoil to it, you will end up with a 243 Win. From a technical point of view, the 6BR obsoleted it with same/better ballistics using much less powder.
About the only reason to consider 243 Win is off-the-shelf ammo everywhere and easier mag feeding.
It’s easy to forget when you’re shooting 6BR.Don’t forget barrel life!