I saw the rifles that the Knight shooting team were using in their new catalogue and they were using heavy barrel disc rifles in .45 caliber with a 1 in 18" twist. Go figure. I have had some of their techs tell me the .45 isnt as accurate as the .50s,yet they use them for competition. I wonder what loads they are using? I might have to give them a call and find out. I always heard the faster twist .45 rifles were about useless according to precision rifle bullets site. I know some traditions were 1 in 20". I hada LD magnum 26"and it shot the heavy 275 gr.aero tip power belts real well with 150 grains of pyrodex pellets.