Custom Calibers

[Red_Harvest]

Hey All! I was wondering what would be the process of making a custom caliber.

I was watching the YouTube and a video concerning Nano Sonics. It was a .338 bullet in a 10mm auto case. It was a subsonic only bullet and the reasoning as far as I have found was to use the most uniform amout of powder in case space. I have a passion for Subsonic hunting and would like to design a caliber for the AR15 using a .416 bullet. The reasoning is a .416 has a high BC and a bit more weight available to it. I would like to get something in the flavor of a Maker CNC made maximum expansion bullet to use for it. I like the idea of those fast twist 1-3 barrels. Plus pointy bullets look cool. Anyone want to help? I'm open to advice and direction.

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[JGSFAB]

You really need to be able to make or mod some dies. With that said AR10/LR308 frame might support the long boys,

 

[Saladfarmer]

what about a .338 in a 400 legend case cut down a little bit. same diameter as the 10mm case just longer. and it'll fit an ar platform better.
and you will have that little bottleneck in there like a 300 blackout or 277 wlv

 

[NeoBlackdog]

Already been done. Look up the .416 Thumper.

 

[bcp]

Might find something in these lists.

List of AR platform cartridges - Wikipedia

en.wikipedia.org

AR-15 Calibers And Cartridges: What Should You Chamber Your Carbine?

AR-15 Calibers and cartridges are legion, finding the right one is a matter of matching it to the job you want your rifle to perform.

gundigest.com

https://palmettostatearmory.com/blog/a-guide-to-ar-15-calibers.html

An Official Journal Of The NRA | The Complete Guide to AR-15 Cartridges

With all of the chambering options available for the AR-15 platform, which one is the best? The answer is: It depends.

www.shootingillustrated.com

Different AR-15 Calibers You Should Know

Learn about different types of AR-15 calibers available that you should know, and shop RailScales for your hand stops, rail covers, and other AR-15 accessories today!

railscales.us

Bruce

 

[JGSFAB]

.416 Thumper.

Never gonna fit in an AR with that bolt face.... But if the .500 Phantom (BMG bullet) can fit in an AR10 so can the high BC .416 bullets.
With the Magnum bolt many things are possible. The Nemo Omen/ BCA BC8 has lots of potential.