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  #1  
Old 05-10-2020, 06:24 PM
SmokinJoe SmokinJoe is offline
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Default Designing a New Cartridge

https://www.dropbox.com/s/cnd0ltik3t...?dl=0Sketching up a new cartridge that would be about half way in-between a 22 TCM and TBR's 22 Tanuki. What I am trying to accomplish is a cartridge of K-Hornet or standard Bee capacity/performance in a 223 boltface with the 222 neck. I made a couple pieces of trial brass using a TCM FL die to form them and they look pretty good. Using 300MP ball powder to the base of the neck, the TCM held 14 grs, my cartridge 17 grs and the Tanuki 20 grs. The 17 gr capacity with that powder is also similar to 5.7 Johnson/22 Spitfire. The one thing I'm not settled on is shoulder angle. Leaving it with the 23 degree shoulder would be a little easier but I'm really inclined to make it a 30 degree shoulder for a bit better burning characteristics. So, what do you guys think, both of the concept and shoulder Your input would be greatly appreciated. Thanks, Joe

Trying to add a picture but can't for the life of me get it to work, argh!

Coming closer - fiddled around and have a link showing that will get you to a pic, new cartridge is marked "17", others are K-Hornet, TCM, my cartridge, 22 Spitfire, 22 Tanuki and 221FB.

Last edited by SmokinJoe; 05-10-2020 at 08:35 PM. Reason: photo
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  #2  
Old 05-10-2020, 07:06 PM
cosh cosh is offline
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Maybe a shorter 221 Fireball with a longer 222 Rem neck?? This is an estimate using Load from a Disk.



Hoping a pic link works - didnt do this before.
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  #3  
Old 05-10-2020, 08:14 PM
SmokinJoe SmokinJoe is offline
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Thanks cosh, basically if you shorten a FB case 1/8" and make the neck .312 long, you will have the basic case. Want to post a pic of it along with some other small 22's, but just can't seem to figure it out. Any volunteers want to walk me through posting pics? I just started Dropbox, so that is where pics will come from. Thanks anyone.
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Old 05-11-2020, 12:11 AM
moorepower moorepower is offline
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"IF" I wanted a "new" .22 round I would shrink a 6mmBR to .223 case size, including neck length and angle.
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  #5  
Old 05-11-2020, 12:31 AM
cosh cosh is offline
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I use picturetrail, free but not much space. Once the picture is uploaded you can get a url for forum posts. It worked for this forum. Probably better options for HQ photos though. I don’t know Dropbox linking.. maybe someone can show how.
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  #6  
Old 05-11-2020, 04:56 AM
georgeld georgeld is offline
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WHY???????????????

It's been done before, just look around!
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"Gun Control is NOT about guns,
it's about CONTROL!!"
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  #7  
Old 05-11-2020, 05:48 AM
squirrel_slayer squirrel_slayer is offline
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Sounds about like my 22 Mamba except with a longer neck.

Mine is 1.125" case 30' shoulder, .369@the body/shoulder junction (ie. blown out) but a .179" neck length measures 17.1-17.3gr H2o


Shown with 55gr, 95gr and .223 for comparison.

As for the 23' vs 30' here is a photo of the .223 Short(developed by Brian Lewis) in comparison to the 22 Mamba (which is essentially an "improved" .223 short)


The .223 short sports a 23' shoulder, .203" neck and same body diameter @ shoulder as a .223 remington.

Now here are some of my findings. the 23' shoulder forms beautifully in a single stroke. the 30' shoulder=crush like an accordian 100% of the time if tried to go from .223 even in multiple steps. if you push the shoulder back 2/3's of the way with the .223 short (or 22 tcm) die then use a 30' shoulder die your golden. Haven't figured out the why of this yet but it has remained constant for both myself and Brian.

Now when speaking performance. .223 brass is some very strong stuff and despite having similar case capacities of the k-hornet/bee you will far out perform both of those cartridges due to the higher capable operating pressures of the parent brass/actions. We run the .223 short to 55k psi and got 3260 ft/sec from an 18" barrel with 40gr bullets.

Now with the 22 Mamba I designed it to have a ".223 wylde" throat which allows 62k psi operating pressures. Now we haven't really opened it up so to speak yet but I will say with very mild loads (calculated to sub 50k psi) were getting 53gr bullets into the high 2900 low 3000 ft/sec range and 40's over 3300 using the same powder charge as the .223 short (so again well below full pressure)

We picked up 1-1.2gr H2o capacity with the blown out body and .024" blown forward 30' shoulder.

Oh and one last thing. These pipsqueeks nosebomb fast with bullets over 50gr (with an exception to the 53gr bullets seated long as they don't eat into the powder column too bad due to their vld style ogive which allows the longer seating length)

Last edited by squirrel_slayer; 05-11-2020 at 06:20 AM.
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