I have an idea for a new autoloading cartridge.

[The_Shadow]

Another thought would be to neck down a 357Sig casing which fits the 10mm breech face and magazines.  I have loaded the 357Sig and 9x25Dillon and shoot them from my Glock pistols with nothing but a barrel swap.  Therefore either of those casings could bring you closer to the (.327 Auto Mag.) you seek fairly easily.

The thing is getting barrels with that bore and cut to the firearm you intend to shoot it from.  Reamer for the chamber specifications for the cartridge when you finalize the design.  Custom set of dies made to you cartridge specs as well.

[Captain O]

Sorry about that Captain O...7.95 X 19 cartridge. (.327 Auto Mag.), What if you used the 22TCM as your parent case then necked it up?  The COAL of Overall length of 1.265 in (32.1 mm) to fit the magazine and still have enough space for powder and bullet.  The 22TCM could be a platform case to have strength and longevity.

An excellent suggestion. I am simply attempting to replicate the .327 Fed. Mag in an autoloading cartridge, I'm certain you understand the concept.

[DM1906]

......I am simply attempting to replicate the .327 Fed. Mag in an autoloading cartridge......

This describes the .38 Super. Side-by-side, they are very similar. The difference is the bore, and pressure range needed to get the lighter bullet up to the power level. The 9mm as a base case is too small. You can't get there at pistol level pressures. It isn't likely you can get there with any 9mm size frame pistol. You could, with a .357 Sig base, but the neck reduction is too much for a short pistol cartridge. You are dealing with a .312" bore (not ".327", which is just an obscure number, essentially .30 caliber).

[Captain O]

......I am simply attempting to replicate the .327 Fed. Mag in an autoloading cartridge......

This describes the .38 Super. Side-by-side, they are very similar. The difference is the bore, and pressure range needed to get the lighter bullet up to the power level. The 9mm as a base case is too small. You can't get there at pistol level pressures. It isn't likely you can get there with any 9mm size frame pistol. You could, with a .357 Sig base, but the neck reduction is too much for a short pistol cartridge. You are dealing with a .312" bore (not ".327", which is just an obscure number, essentially .30 caliber).

I believe you are correct. The 9mm is too small. The .327 moniker is, of course, incorrect. i know that we are dealing with a .312" diameter projectile. The object is to arrange for an FMJ bullet to excel at long distances, while permiting the use of a bullet of up to 124 grains. It would make a good carbine round, and a 'hot rock' defense pistol. Light (98 grain) Speer Gold Dot bullets would be a great varmint/SD load.

[DM1906]

I am becoming intrigued (like I really need another project). The ".327" is an excellent caliber of choice, as the selection of commonly available bullets is enormous. I think it's, at least, doable, and just may have legs.

[Captain O]

I am becoming intrigued (like I really need another project). The ".327" is an excellent caliber of choice, as the selection of commonly available bullets is enormous. I think it's, at least, doable, and just may have legs.

Let's "take it for a walk". 

[DM1906]

I am becoming intrigued (like I really need another project). The ".327" is an excellent caliber of choice, as the selection of commonly available bullets is enormous. I think it's, at least, doable, and just may have legs.

Let's "take it for a walk". 

So I did. Step 2 (of a thousand)........




[attachment deleted by admin]

[Captain O]

I am becoming intrigued (like I really need another project). The ".327" is an excellent caliber of choice, as the selection of commonly available bullets is enormous. I think it's, at least, doable, and just may have legs.

Let's "take it for a walk". 

So I did. Step 2 (of a thousand)........

Outstanding! I can imagine that it would not only be a marvelous varminter, but the pistol could put a terminal case of "hurts" on someone in short order. thanks for the visualization, my friend.

[DM1906]

OK. This is your baby. How do you want to proceed? (it doesn't get easier, from here....) This cartridge had potential. You have my attention........

[Captain O]

I still see the 98-grain bullet as the "standard" JHP load for the cartridge. This would provide ample bullet weight, thus avoiding bullet deflection if one strikes a bone (or bones). The lightest possible practical bullet for the cartridge would be a 71 grain FMJ.

Imagine how controllable this would be in a SMG,  Power?  No problem! With a cyclic rate of about 800 rpm you could tear the living daylights out of anything that manages to get in the way. Short bursts of 3-5 rounds could be used as suppressive fire, or killshots with plenty of room for error. Pointed Soft Points wold be a definite plus for the round.

A 4" barreled auto that a woman can handle, with a magazine capacity of 12 could hold some real promise! The light recoil, guaranteed penetration, accuracy and the ability to "blossom" as it it were a daisy on a spring morning are all excellent selling points. The "bottleneck" cartridge virtually guarantees excellent feeding!

Now, to whom should we sell the idea?

[DM1906]

I was thinking 100 gr. XTP. It's rated above 1800 FPS, while most other JHP's are only about 1400. Not an issue for a 4" barrel, but it should really excel in longer bores.

Recoil should be around the level of the 9mm or .40SW, perhaps +P. Probably not the best candidate for a (sub) compact or "lady pistol". You said yourself, "no belly gun", and I agree. A shorter version could be developed later for smaller frame pistols, but you're getting away from the original concept, and we already have .32 autos in nearly that power range.

It could work well in a SMG or short-stroke AR. Potentially with a cyclic rate around 1200. 3-5 bursts would be like single-shots, and nearly recoilless. I like that Idea for a breach weapon. A 14" bbl should easily approach the 1800-2000 FPS area. Long way to go before we see that, though.

Sell? It's your concept. Run with it. It's too early, and some other yahoo would just screw it up!

[The_Shadow]

Looks nice...based on the 38Super casing would place you looking at guns designed for it or the 9x23 Winchester.

Finding someone to cut barrels and make reamers and dies will be a challenge...but could be done.

[sqlbullet]

Clymer will cut custom reamers for ya, and Redding, Lyman and RCBS will make dies based on the reamer drawings.

[DM1906]

Looks nice...based on the 38Super casing would place you looking at guns designed for it or the 9x23 Winchester.

Finding someone to cut barrels and make reamers and dies will be a challenge...but could be done.

The OP's goal is full-size. Not pocket/belly guns, and I agree. We already have options in the the "light" department. However, that's not to say a "special" won't be developed in the process. A "mini-me" with about a 1.200" MOAL wouldn't be too puny.

Not really a challenge. Dozens of options available. Not my first time. TCC barrels aren't expensive, and neither are Ruger caliber-bored cylinders. Both offer .32 caliber bores, and can be ordered w/o chambering. Prototypes are almost always more costly than production products, but there are lots of ways to keep the expenses to a minimum.

[DM1906]

Clymer will cut custom reamers for ya, and Redding, Lyman and RCBS will make dies based on the reamer drawings.

Expensive stretches for developing a prototype, but that's ultimately what happens. Re-do's are even more costly, but that's how it works. This is why the Ruger (or whatever revolver) caliber-bore cylinder is the best way to get it done. 6 chances, while TCC only allows one.