6mm-223

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Originally Posted by belizejet

Wow! Thanks for all the info. I want to stick with my standard AR mags since I cant get any new ones (maybe someday we will get our freedoms back). The 6.5 and 6.8 use different mags dont they?

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If you are talking about the 6.5Grendel and the 6.8 SPC, yes, different bolts and different mags. The 6x45 is a pretty decent cartridge. It is actually one you can reasonably use as an all-around AR if you reload since the Nosler Varmageddon is about $165/1K.

If you want a 6.5 in the same vein as the 6x45, give me about a month and I will have my prototype up and running. Everything the same as the .223/5.56 except the barrel. Bullets are more coin, and heavier, but the ballistics are very promising.

Looks like it is a lead time of at least 6 months just for a barrel. I guess I should order one and it will be a later project.

MarkCO sounds good. Let me know how it works. Im looking for a cartridge with a little more umpf than the .223. Already have a 300BLK but I know there is a perfect cartridge out in the world for an AR that you can hunt with and is more efficient at longer ranges than a 300BLK. I am thinking 6 or 6.5 mm.

Sure will. Just FYI, my starting point is a 107 Sierra at 2650 from an 18" barrel. After that, I will try 95s, 123s and 130s. No plans to go heavier. There is not a lot of data, so I am working it all up in a pretty conservative manner.

Didn't know that .243 projectiles got heavier than 115 grn.

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Originally Posted by belizejet

Didn't know that .243 projectiles got heavier than 115 grn.

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David Tubb made a run of 117s. He put a plastic tip in the 115 Matchking (DTAC) until they kept blowing up on the way to the 800-1000 yard targets at the 2008-ish Rocky Mountain long range championship.

That is/was the heaviest 6mm that I know of.

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Originally Posted by belizejet

Didn't know that .243 projectiles got heavier than 115 grn.

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I am using 6.5 bullets.

OK, another question. I am thinking of finally pulling the trigger on a 6x45 barrel in 18" but dont know what twist. 1:9 or 1:10? I plan on trying standard size .243 projectiles like 85grn plus or minus. not any heaver than 95grn or I would lose any advantage you gain over the 300BLK. I bought the dies already to start making brass and now I want to build the upper.

OK, here is a dumb ass I don't know crap question.

If the 6 and 5.56 (.223) both are 45mm in length and using the same bolt, what prevents one from pulling a Tard move like chambering a .223 or 5.56 and pulling the trigger in a 6X45 ?
I can see the oppisite of a 6x45 not fully chambering in a 5.56x45.

its called fire-forming.