5.7X28 necked down to .17????

[extremeaccuracy]

Sniper338, if your open to suggestions I'd like to recommend you looking into using 22 TCM brass for your project. I should preface this with the fact that the overwhelming majority of my testing with both the 5.7X28 and 22 TCM brass has been for use in 14 caliber rifles though so your results may very.

I think you'll find the 5.7 x 28 neck reduction will save you some time and have less material to remove when truing the necks up while the 22 TCM will require more material to be removed. Having said that if your okay inside and outside neck turning after reduction, from my findings, (reducing it to 14 and 12 caliber) you'll find the 22 TCM brass to yield better results in the long haul.

I've been pretty pleased with both the neck reduction and fire forming properties of the ARMSCOR 22 TCM brass that I have used here. It has been pretty consistent and yielded good brass for our 14 TCM Extreme chamberings. (I have not had a chance to do much testing with it in 12 caliber yet.) The price is very reasonable as well.

I think if your looking in the 15 gr. powder weight capacity range for your finished cartridge you'll find it to be a good fit.

Wish you the very best of luck on your project which ever route you take,

Carl C.

Extreme Accuracy
www.14caliber.com

 

[AndyA]

Made one up tonight. Not very good, but just an idea.

17-5.7x28 on left, 17WSM on right.

 

[Wolfdog91]

Made one up tonight. Not very good, but just an idea.

17-5.7x28 on left, 17WSM on right.
View attachment 1724695

...ok I need you to make a reamer for this ASAP lol !

 

[extremeaccuracy]

I would never try to tell anyone not to build whatever they want and I do love to see people experimenting with new cartridge designs. (I know this wasn’t ask for and I apologize greatly if I’m giving advice that isn’t wanted) I would like to throw out, for anyone heading down a similar path, that they very well might want to look into researching using the 22 TCM for a parent cartridge for this size engine room.

I have spent a GREAT deal of time working with cartridge designs in this size and would highly suggest to anyone going down that path to heavily look into researching the 22 TCM cartridge as an option. The readily available .384” bolt face of the 22 TCM (versus the .318” bolt face of the 5.7x28) is a very big advantage. The significant increase in safe chamber pressures in the 22 TCM brass versus the thin based 5.7x28 brass is also heavily preferred in my personal cartridge designs.

While I did experiment early on with the 5.7x28 brass I quickly switched over to the 22 TCM for this size engine room. While this very well might not be what you’re looking for. The extra 1.2 grain interior dimension of the 22 TCM was also a desirable feature for my use. (14 TCM Extreme and the 12 TCM Extreme). I do think you’ll find similar advantages in the larger bore 17 caliber designs as well.

Again I apologize greatly for giving advice that was not asked for and very well might not be wanted. I just wanted to pass on my experiences from going down this path.

I wish you the very best of luck on your project whichever way you go and do hope you have great fun and success along the way.

Keep on target,

Carl C.

Extreme Accuracy

www.14caliber.com

 

[ELR LVR]

I could see that... a little round like that would be fun though... not much that size ive seen..

I have been thinking of this too
such a cute case
I have a .17 Hornet chamber for a Ruger #3
its a fun round too

 

[ELR LVR]

Seems to me that these little bitty wildcats offer no advantage over the 17 hornet or 17 fireball.

Yeah I think the Hornet is as small as needed otherwise just use a 17 HMR
the 17/5.7x28 sounds cool because it would be like a reloadable 17 HMR
I like the .17 Ackley Jet the best (22 Jet Necked down, looks like a 17 PPC) 3700fps w/25's