cartridge hypothesis thread 4.6x30 vs 5.7x28

[Chriznak]

I was pondering:

if we neck-up the 4.6 to 5mm or neck-down the 5.7 to 5mm, would either of those wildcats work in both weapons?

if there were a non-proprietary round that worked in both the p90 and mp7, would there be more designs coming out to compete with those 2 in the pdw niche?

[Open1215]

5.7 is much more accessible, even with 5.7 ar uppers. The mp7, I personally don't know a single civilian with one. I think more and more companies are making the 5.7 and I think it will continue to grow in popularity. I wish brass was something that could be made, like 300blk. Then I think it would be much more popular. I'm surprised the 22tcm isn't more popular. If Masterpiece arms would make uzi or mac style chambered in .22tcm that would be awesome. Plus you can make the brass from .223