7x45 ammo

[yaujar]

Does anyone know where I can find some 7x45 rounds? I was told that no one sells that commercially and it has to be privately made. I wonder if there is anyone in the calgun community that point me to the right direction

[stilly]

What is it used for? What rifle; what are other names for it?

And I am stepping cautiously here... >:

[Whiterabbit]

make it. Not that hard. take an expander ball from any 7mm die set and open up your 223. Doesnt have to be a perfect fit, just good enough to chamber and hold a bullet. Then fireform it to your chamber and you are GTG.

If you are talking about 7TCU then there is a shop in paso robles with a couple bags of empty brass ready to go. if you are talking about straight necking up a 223 to 7mm, then that brass will probably be too improved to fit.

If your expander ball doesnt fit the neck, or you crush too many cases, you can make a mandrel to open up the case. use a 1/4" rod and taper the end. Use that to open up the 223 to 25 cal then run it through the 7mm expander ball and fireform.

OR, you can load 223 shells with light charges and a filler, then fireform it in the chamber of the gun in one go. That's the general idea of the process, and if you want to do that, talk to someone experienced in doing it to get all the tips for what powder to use, what charge, what filler (cream of wheat? grits?) etc. The details.

[Whiterabbit]

Here's one I was experimenting with.



Designed to shoot 7mm cast lead bullets in an AR15. 7x39 or so, maybe 38, with an extra long neck.

[pacrat]

7x45? There are several different versions. Depending on neck/shoulder loc./shoulder angle, etc. All of them 'wildcat" DIY propositions.

The 7TCU as Whiterabbit said is one of them. And also the version I have. Annealing the neck before you expand from .224 to .284 will save some headaches. So will using the looong tapered Lee type expander as opposed to the short buttons.

JM2c

[stilly]

0o0o0o Think of the subsonic capabilities there...

[Whiterabbit]

if you are talking about my pic, yes, that is why I designed it. It has a long neck to support cast lead bullets, but at the same time it is short enough to crimp a nose-to-crimp length bullet long enough to support a heavyweight like the RCBS 162 grain 7mm bullet. At the same time, the length is equivalent to support a 140 grain barnes bullet or 100 grain hornaday bullet and fit an AR-15 magazine. And of course, using modern powders, has plenty of oomph to get 175 grain bullets to 1150 fps, which is the design speed.

Of cource, cycling an AR15 bolt is based on pressure and buffer weight, which are separately tunable based on gas system length and whether you have a lathe to turn captured weghts spun on a guide rod. Which I do.

If you were talking about the 7x45, there is WAY more case capacity than needed to drive a 7mm bullet supersonic, even if a 175 grain mil surp bullet.