Oldbloke wrote:IMO.
223, 204 or 22.250.
Why root around?
SCJ429 wrote:It is worth doing just because the case looks so much cooler. And you get a little more speed. You can still shoot standard 223 ammo which groups pretty well.
AZZA'S HJ47 wrote:Yes also thinking the same thing i was reading a build up thread from the states regarding a 223 AI and a 1-7 twist barrell. Have also thought the same thing with a 222 rem mag AI but then again Id be getting into something a little more Oddball if i were to do that.
My 22-250AI shoots under a inch whilst fireforming brass would be worthwhile adding another ackley to the chest as i dont have a sporter 223.
Oldbloke wrote:Lol. I'm boring.
SCJ429 wrote:It is worth doing just because the case looks so much cooler. And you get a little more speed. You can still shoot standard 223 ammo which groups pretty well.
Blr243 wrote:When u fire a standard 223 in an ankley chamber, what happens to the headspace prior to it being fire formed? Does the extractor claw hold it close enough to the bolt face?
bigrich wrote:i'm suprised at the interest in the 223 ackley idea . i'll save my pennies and see if i can make it happen . i'd be interested to hear about any interesting ballistics "strikey" since you've done it
i was thinking with 40 and 50 BT's it might work like a mini 22-250 in terms of a flatter trajectory .
i have a weatherby vangaurd , but the barrels down to 20.5" and it's a 1-9 twist . i only want to shoot 40-55 grain projectiles.
any opinion on twist rate if i rebarrel or seek a donor rifle
SCJ429 wrote:I don't shoot 40 grain projectiles but I got a little over 100 fps increase shooting 50 grain VMax. When shooting 80 grain Bergers I got over 200 fps increase in speed which is very handy when shooting out to 500 metres.
I did not experience any increase or decrease in accuracy so don't expect the case to suddenly shoot like a PPC. I shot some local comps and the Fly shoot with it but didn't come close to guys shooting a 6mm BR. If someone won a competition using the 223AI case, then the standard wasn't particularly high, either that or he was heaps better than me.
Strikey wrote:bigrich wrote:i'm suprised at the interest in the 223 ackley idea . i'll save my pennies and see if i can make it happen . i'd be interested to hear about any interesting ballistics "strikey" since you've done it
i was thinking with 40 and 50 BT's it might work like a mini 22-250 in terms of a flatter trajectory .
i have a weatherby vangaurd , but the barrels down to 20.5" and it's a 1-9 twist . i only want to shoot 40-55 grain projectiles.
any opinion on twist rate if i rebarrel or seek a donor rifle
Can't help you with 40 and 50grn projectiles, I only use the Speer 55's for fireforming, with Sierra 52grn Matchkings I am getting 3640/50fps and Sierra 69grn Matchkings 3140fps, mainly used as a range rifle, barrel length is just short of 24 inches, Howa varmint 1in 9 twist with a 11 degree target crown. Reckon I could squeeze more velocity out of it but being a typical Howa it needs the firing pin to be bushed, I'm using BR4 primers and get the occasional one that will pierce, that problem will be fixed when it gets a new barrel.
deye243 wrote:AI chamberings are only worth it if you have a separate barrel to screw in to fire form brass otherwise you are just burning up your throat on a bloody good barrel absolute waste of friggin time
deye243 wrote:AI chamberings are only worth it if you have a separate barrel to screw in to fire form brass otherwise you are just burning up your throat on a bloody good barrel absolute waste of friggin time
straightshooter wrote:The AI range of cartridges have only one real advantage and that is the reduction of case stretching with repeated use.
Most other advantages, such as the one most are sold on which is the massive increases in velocity, are closer to a fantasy and is propagated by those who entertain magical beliefs.
In P.O. Ackley's time there was no ready access to chronographs, unlike today, so advertising hyperbole was commonplace.
Yes you can attain those fantastic velocity increases but at the cost dangerously high pressures, which can equally be achieved with similarly high pressures in the standard cartridge.