223 WSSM Ackley Improved?

[DHall_37]

Hey guys and gals, I’ve been thinking a lot about a cartridge to break 5000 FPS at the muzzle.

A few cartridges that come to mind is the 220 swift, 22-06 and 223 WSSM. All these cartridges also have AI reamers.

Would it be possible to send a 223 WSSM AI with a Hammer 33gr solid copper projectile. Long 30”+ barrel and say 1-14 twist or 1-16 and go over 5000?

This just a shower thought, but thought it may make for some interesting discussion nonetheless.

 

[B23]

I think if I was trying to do something like that, instead of going to the expense and extra long wait for custom dies I'd probably look at building a 22-284. Not only will brass quality will be substantially better but availability of brass will be considerably easier not to mention you'd be getting the same or more case capacity without having to "AI" the case.

Also, a fire breathing dragon such as this that is so overbore won't have much barrel life and would probably be a good candidate to use Bartlein's 400MODBB steel barrel.

 

[nvtoy]

I’ve heard the WSSM case will not blow out very well because of the thickness of the brass. Same reason it won’t obturate and leaves soot on case neck and shoulder.

 

[Prose]

The 17 rem with a 15.5 Hornady NTX copper bullet will go over 4,900 fps according to book data (24"). I'd wager that it can be bested with a 30" barrel and some other minor changes. Sacrificial brass ought to get you there in one try with some Benchmark IIRC.

A 17 Rem AI ought to get you there more better.

 

[DHall_37]

The 17 rem with a 15.5 Hornady NTX copper bullet will go over 4,900 fps according to book data (24"). I'd wager that it can be bested with a 30" barrel and some other minor changes. Sacrificial brass ought to get you there in one try with some Benchmark IIRC.

A 17 Rem AI ought to get you there more better.

I’ve heard the 17 cals go stupid fast and have pretty good long range performance.

 

[deadidarren]

I’ve heard the WSSM case will not blow out very well because of the thickness of the brass. Same reason it won’t obturate and leaves soot on case neck and shoulder.

Nothing a Tight neck and a neck turn won't fix

 

[DHall_37]

Nothing a Tight neck and a neck turn won't fix

I’ve heavily considered the 223 WSSM AI as it seems like the 22-250 AI of the 5000 fps world. I’m sure the hammer bullets can handle over 5000 fps easy.

Also considering 22-284, however it kinda seems very similar to the 22-06 in terms of capacity. But I can’t quote any hard numbers on case volume.

 

[B23]

Also considering 22-284, however it kinda seems very similar to the 22-06 in terms of capacity. But I can’t quote any hard numbers on case volume.

Correct, the 284 and 06 case have pretty much the same case capacity so naturally a 22-284 and 22-06 will be the same as well. Depending on brass, their case capacity is right around 63gr H20 For comparison, the a 22-6mm and 22-243 are 50-52gr H20 The 22-243AI is 54-55gr H20 and a 22-6mm Ackley Improved is 60-61gr H20

I think the easiest of the bunch is definitely the 22-284 and necking down 6.5-284 Lapua brass is easy peasy and probably can be done in two maybe three steps, at the most, with a 6.5-284 bushing die. I neck it down in one step for my 6-284.

 

[snert]

I am thinking that building from WSSM right now would be like trying to make a BBQ menu with brontosaurus as the main dish.

 

[DHall_37]

Correct, the 284 and 06 case have pretty much the same case capacity so naturally a 22-284 and 22-06 will be the same as well. Depending on brass, their case capacity is right around 63gr H20 For comparison, the a 22-6mm and 22-243 are 50-52gr H20 The 22-243AI is 54-55gr H20 and a 22-6mm Ackley Improved is 60-61gr H20

I think the easiest of the bunch is definitely the 22-284 and necking down 6.5-284 Lapua brass is easy peasy and probably can be done in two maybe three steps, at the most, with a 6.5-284 bushing die. I neck it down in one step for my 6-284.

How do you reckon the 22BR would work?

My boss has a 6-284 reamer and said he couldn’t get good accuracy out of it and rechambered the barrel before he got a good load. However 5k FPS is still the goal and also good accuracy too. I’d also like to get it to shoot before I erode out the throat lol.

 

[B23]

My boss has a 6-284 reamer and said he couldn’t get good accuracy out of it and burnt up the barrel before he got a good load. However 5k FPS is still the goal and also good accuracy too. I’d also like to get it to shoot before I erode out the throat lol.

My 6-284 has always shot extremely well.

 

[1lessdog]

I shoot a 22-6MM AI 1 - 13.5 twist with 26 inch Brux barrel. Pushing 50 gr Sierra Blitzkings at 4450 FPS. I know I can push them over 4600 pretty easy. I hold on fur out to 475 yds


Im pretty sure with 40 gr they would get up in the 4900 range. And that is moving, if I was looking for 5000 fps I would have a 1 - 14 twist.

 

[davidjoe]

I think if I was trying to do something like that, instead of going to the expense and extra long wait for custom dies I'd probably look at building a 22-284. Not only will brass quality will be substantially better but availability of brass will be considerably easier not to mention you'd be getting the same or more case capacity without having to "AI" the case.

Also, a fire breathing dragon such as this that is so overbore won't have much barrel life and would probably be a good candidate to use Bartlein's 400MODBB steel barrel.

I knew a guy, he passed away, who barreled guns. He had that cartridge loaded up, with an unfired barrel of his, which he said would remain unfired until a guy put $10k down against him, for the smallest 300 yard group.

This individual had a number of 300 yd groups on the wall that he could completely cover with a cigarette butt.

He told me that high BC at the slow velocities I ran were inherently inaccurate and paled in comparison to the accuracy on paper he could get from ultra high velocity.

He was also quite adamant that his unfired barrel was so short for this earth, that it was good for winning one bet against any gun and any shooter, which it assuredly would win, despite no break-in whatsoever.

As far as I know, no one ever wanted to test his theory.

 

[Ray123]

The 17 Remington will do 4900 fps with Hornady 15 5 gr copper bullets...I've shot them in my 17 Remington...never tried to hit 5000 fps...it might be possible, with testing. So 5000 fps can be done with standard chambering in 24" barrel...a 28" barrel would probably do it easily. But what is the point, besides just doing it. I probably could machine some light copper bullets ...or use Leigh Defense Close Quarters 78 gr in the 300 RUM would likely hit 5000 fps...as 250 ATIP are at 3000 fps 101 grs of powder...a short range endeavor, with all the light bullets, that slow down very quickly, and drift drastically in the wind. But everything's there for the 17 Remington and hand loaded with the 15.5 gr bullets and 4900 fps, and a little extra get 4950 to 5000 fps....if ya want...I have a 50BMG with a 78 gr bullet, a sabot, and 270 to 280 grs of US 869 powder ... sounds... fast!