WoodenFrog; FWIW, The GC style bullet, fired without the GC is aerodynamically similar to a Boat Tail bullet!
I have used GC style bullets in 30-30 Win, 357 Mag, 44 Mag and 444 Marlin, all with and without the Gas Checks installed!
The only thing that I've found (as said in above posts) is that without the GS's, you need to keep your speed down to around 1600 FPS!