What casevolume would I need to push a 90grain .224cal bullet at 3400ft/sec.

J.

Maybe what twist and what barrel length is a better question. One in 7.5? 28"
Sounds like you want a 22-243

quote:

Originally posted by boom stick:
Maybe what twist and what barrel length is a better question. One in 7.5? 28"
Sounds like you want a 22-243

Ofcouse..important parameters too. a barrellengh of some 26-27" and the required twist is 1:7 to stabilize these long bullets.

I am sort of waving back and forward regarding an ultimate flattest shooting smallbore caliber for springbok in SA. My .270wea does it dandy already but I have now experienced a .22-250 does a perfect job too. Maybe a Ackley Imp. would also be a comprimise...however a long 224cal bullet weighing some 90 grain with a Bc. of .551 could have a potential.

quote:

Originally posted by jens poulsen:
What casevolume would I need to push a 90grain .224cal bullet at 3400ft/sec.

J.

You might be able to do that in a 223WSSM if not want to build something like the 22x243.

It is doable but my oh my is it going to be a barrelburner!!!



55gr Norma MRP 2
4258 bar max pressure (kind of high but in the ok range)
1032m/s~3386fps
Energy 3106j~2291ft/lbs


22-350 Remington Magnum. Never heard of it, a wildcat for sure.

Seems like a job for a 22-.270 Gibbs IMP with a long throat. If you were using case fulls of 5010 or 5020 you might be able to burn all the powder , get great velocity and work at relatively reduced pressures. Pure speculation on my part. roger

doesn't the headstamp of the ammo have to match the caliber stamped on the rifle?
to get it into africa, i guess is what i am asking.
if so something that could be stamped on the brass like adding a 22- [even if by hand] in front of 270 on the cases headstamp would influence my decision.
a 50 or 60 gr case is easy enough to come by, a 219 zipper improved will hold near 50 grs of powder or you can get more from the improved 22-250. or any of the x57 cases.
going to the slower powders should give you enough gas volumn to push that bullet down the long bbl without pressure problems.

The Dane,

quote:

Dont go spoiling a perfectly good thread with too many facts.

Generally I wouldn't agree with that quote. False facts are dangerous. Your QL results are a little too heavy (maybe much to heavy) for my tastes. There are limits to everything in life.

quote:

Originally posted by MickinColo:
The Dane,

quote:

Dont go spoiling a perfectly good thread with too many facts.

Generally I wouldn't agree with that quote. False facts are dangerous. Your QL results are a little too heavy (maybe much to heavy) for my tastes. There are limits to everything in life.

Todays actions are strong enough to do high pressures. Most new "wildcats" are rated max. at @4450bar~64500psi. So while the pressure is high for the parent cartridge it is well below the plasticity of good brass.

Lazzeroni lists reloading data with pressures in the 66200psi~4565bar range.

Thanks gents!.

As stated I am waving a little..calibers like 6mm/WSM or .284/6mm or plain jane vanilla like the old .220Swift or the "Rocket" version has also been up on the drawingboard. Calibers like the .22-250 Ack. Imp or the .224Wea does also have an appeal.
Here is the deal. My .270ea does 3450 m/sec with a 135grain Sierra MK. I want a .224/6mm cartridge that does better with atleast a 70-80grain bullets ballistic vise..not powervise. Maybe asking a 90grain bullet in .224cal to do +3400 Ft/sec is too much for the barrel..?.
I dislike the 5,6x57 because its a reloaders nightmare becauser of the thick neck wall.
The old 5,6x61 Vom Hofe could become a classic or the more modern 6x62Feres. Th Vom Hofe however shoot the the .228Cal bullets which would require homeswaged bullet to make high Bc bullets where the 6x62 is On par with the .240Wea.

quote:

Todays actions are strong enough to do high pressures. Most new "wildcats" are rated max. at @4450bar~64500psi. So while the pressure is high for the parent cartridge it is well below the plasticity of good brass.

I understand that. I don’t know if this cartridge is practical but it may answer Jen's original question at a lower pressure.





Looks a lot like a fat Cheetah to me. I wouldn’t mind some feedback from readers. I have no passion about it one way or the other. Just interested in what people think.

I have shot 80gr from a 22/243 Middlested at 3400 from a 9 twist 26" barrel. When the weather warms I will try some 90's with my 30" gun.

www.duanesguns.com

Jens,

it's a shame you aren't closer. I have a set of 22-284 reamers. From a 28" 1:8 twist barrel I can get the 80gr JLK or Sierra (copy of the JLK) right at 3600fps, and in the 3/8ths moa range out to 600yds. With a 1:7" twist those numbers would be reachable at not too high a pressure with a 90gr.

Mine is called a 223 Valkyrie, and JGS in Oregon made the reamers.


Rich

About a 22-06 or equivelant and a 24" barrel, just as quick guess.

I shoot a 220 Swift with a 1 in 6". With my initial loads I get 2700 with a Berger 90 VLD and with 80gn A-max Hornady, (swiched to a different powder) 3000fps.

This is in a 16.5" barreled Encore handgun.

All the best
todd

For anything but varmint hunting, I believe you are much better going with a larger bore. It's just a lot easier to do. I have a lot of experience with 240 Weatherby, 6-284 and 257 Weatherby. Any 06 6mm case will do, but I threw in the 257 since it may just be the flattest shooting "small big game" rifle in existence. I have never tried it, but the 243 WSSM may be the sleeper, right out of the old factory box. Any of these would do for what you want. They will deliver varmint like accuracy and very flat trajectory out to 500 yds. They are all point blank on deer size game at 350. I am not 22 bashing, but for really flat trajectory and windbucking in the real world, you need to go the heavy route in a .22. With any kind of reasonable barrel life, velocities at 500 yds will be low enough that I would worry about proper bullet performance. A lot of the rifles mentioned will do it, but if you really shoot much, you may need to have a regular barrel exchange program.