Originally Posted by A_Gamehog
Lots of misinformation here, by comparing the 223 and 22-250 with their twist rates. A 223 with a 10 twist shoots 69's a 22-250 with a 12 twist shoots 69's.
For the 12 twist 22-250 you can shoot the 34 Grain dogtowns all the way up to the 69's. I know I own and shoot one.
The most accurate is the long 60 grain V-max @ 3700+ fps.
The 69's from a 22-250 must be shot at 4,000 elevation to work, as the twist is bordering stability.
a 1:12 twist rate is good for roughly .30 B/C in the real world, and even then it's getting ragged. The Hornaday 53 Vmax is rated at .29 B/C, and really a 1:11 barrel would be better. I always work with a .85 factor number when figuring the thing out for a slight bit of cushion. The Sierra 1365 bullet is dead perfect for the 12 twist barrel, and my groups from three barrels seem to show this (mid twos for five shots if I'm lucky). I don't know what the B/C is for the Noslers, but it's gotta be in the .35 or higher range, and with that you need the 1:9 barrel minimum (maybe close to a .40B/C).
a .223 bore barrel in any caliber is still a .223 bore with a certain rate of twist. The twist rate is what stablizes a bullet, and never the velocity or really even the rpm's at impact like we all thought thirty years back. A 1:14 twist 22-250 will not stabalize a bullet any better than a typical .223 in a barrel with the same rate os twist. Just the nature of the beast. It cost me a lot of hard earned money to learn this the hard way