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Yobuck is a f in idiot
I hope the original poster was able to go with heavy bullets in .223 and learn the basics of F-Class.
He would then have a better feel for whether a .243 with heavy bullets, a Creedmoor, or one the portable cannons would work for him.
Would a fast twist 22/250 be better than the 223 ?
If you decide on that, then have it throated for the 80-90gr VLDs. On the other hand if you're going to go that route then you might as well go to a 6mm variant.
6mm-250 AI
I'd go 6XC which was based of the 250 case, but has Norma Brass readily available.
He asked about an F-class cartridge not F/TR. The XC was the cartridge I was talking about but the dasher is where its at for me. Or 6SLR
The heavy-bullet 22-250 would indeed do somewhat better than the .223 but the reason for considering the caliber is that the .223 produces little recoil and muzzle blast. Further, very accurate off-the shelf AR and bolt action rifles are available at reasonable costs.
That, combined with a vast array of ammunition choices, some of which yield trajectories close to that of the now-classic .308 Winchester, means that one can start in the competition and learn enough of the basics to have a better chance of selecting a caliber that is right for him or her.
If one is to build a custom rifle for F-Class as a starter rifle, then it should be at least 6mm or 6.5 mm. Even then, the rifle may soon be shelved for one closer to a fit to that person' interests.
F-Class or F-TR it really doesn't matter as long as you pick a caliber that is legal in whatever type of competition you want to try to undertake. What really matters is can you shoot it consistently. Most calibers mentioned will work and there are others also but if you can't read the wind or a little recoil causes you to flinch then the caliber choice is very important and very individual. You also need to reload to take full advantage of what the rifle is capable of. If you don't reload the caliber choice diminishes dramatically. Distances you wish to shoot also play a part in the choice. So the best caliber for F-Class is the one you can shoot the best that is legal in a gun that stays inside the weight requirements for the sport.