Joel:okay, in that case if someone wanted as much accuracy out of their 223 they could find (or order a barrel) twisted 1-12 or 1-14 and pretty much have it?
Didn't get a chance to shoot slow twisted 223s as much as I would have wanted to. Edi made me curious about jump to the lands in a 222 chamber vs a 223 that might see 77-80 gr bullets as well etc
You can't do that [well you can, but you won't like the results!]
Even with a .223 Remington chamber, if you have a barrel with a 1:12" or 1:14" twist, you cannot shoot 77-80 grain bullets out of it, unless you like making nice, sharp bullet-shaped keyholes in the target. Even in the .22 CHeetah those bullets will not stabilize in a 1:12" twist & they're moving out at more than 3,000 fps, a fair bit faster than what is possible with those bullets out of a .223 case, even a .223AI.
If you want to see how good a .223 can be, then do what I've done, on a cheap [back in the day at least] Stevens 200. Right after buying it new for ~$200 from SIR a number of years ago, I sold the barrel & the stock, picked up a take-off Savage 10-BR laminate stock for $50, bought a couple of take-off stainless-steel HVBR barrels [~$100 each], had the threads & chambers cut off, then threaded & chambered for the .223 by a BR gunsmith. Bought & installed a Savage Basix trigger. Bought & installed a Savage bolt lift kit. Mounted an old B&L 36x FIXED BR scope I had from back when I shot Benchrest.
Using RWS brass, R-P 7 1/2 BR primers, 25.0 grs. of WC735, topped with Berger 52 gr. HPFB-M bullets set to kiss the lands. Best 100 yd. group thus far is 0.255" 300 yd. AGG is 1.875".
My first BR rifle, a sleeved Remington 700 in a glued-in MacMillan fibre-glass BR stock, had a Shilen SS LVBR barrel & a Lilja SS HVBR barrel, both in .222, the trigger had been re-worked to 2 oz. by Grant Schick, who also bushed the firing pin and bolt & installed a Gilkerson insert. I installed a Wolffe spring & Tubb titanium firing pin. It carried the above-mentioned B&L 36x FIXED scope in the old 1.5 oz. shaved Bushnell aluminum rings. It used the same bullets & primers, but R-P brass & N322 [Scottish-made H322]. Looking at my 30+ year old targets, a bunch of them are in the 1's [ie. 0.1###"] & 3 were screamers [ie. 0.0###"], shot at IBS registered BR matches.
I think it is germane to add that rifles chambered for the .223 Remington hold or have held a grand total of 0 records. The Deuce held the world record for the smallest group [5 shots in 0.009"] for 40 years [all of which time the .223 was available if someone wanted to give it a go, not to mention the .22PPC, any of the many versions of the .22 Waldog or the .22 BR] until it was beat a decade ago by a .30 Stewart.