That is difficult to say exactly.
Generally a faster twist will increase pressure a small amount all else being equal .
With factory ammo I can't see that the extra twist will do any harm especially using the longer heavier bullets that may need the extra stability . With very light short bullets in a fast twist you may see some extra precession at long range .
When you reload you are watching the pressure signs anyway and you stop at a sensible load point anyway .
Don't think the 223 has enough powder room to push them too hard but stay away from varmint grenades and very light explosive bullets .
When you have a certain twist rate you should stay with the bullet length and type that suits the twist rate give or take but in the ballpark .
If twist rates were a big factor on safe pressures then the load manuals would be quoting twist rates too .
Just develop a safe load to suit your gun and don't worry too much about what anybody else is doing as it may not be suitable to your gun .
Wether a bullet blows up or not is governed by many factors and you don't know until you run the load /gun combination .
Some of the factors in bullet blow up are.
High pressures for cartridge , High velocities for cartridge , Long barrels , rough barrels , deep "cut rifling " , thin bullet jackets , over hard or very soft bullet jackets , light weight bullets , bullet rotational instability , loose bullet cores , hot burning powders , fast twist rates , tight bore diameters .
Put some of them together and the bullet can explode in the air .
However it would be extremely rare to see so many faults or circumstances in one gun.
Some old Berger bullets were blowing up due to thin jackets , high velocities , deep cut rifling , long barrels , rough barrels , tight bores. Thicker jackets fixed the issue.
