Why not .243 or .25 off the 223/5.56 case?

[10ring1]

I don't know if I'm not thinking clearly today, if it is too cold or if I'm just too bored. Maybe this has been discussed before but just to make conversation. Are there any small frame AR wildcats that is based off the 223/5.56 case for bigger calibers such as 243 or 25? For instance 300 blackout is off the 223/ 556 parent case. Are there any wildcats that fit this description? If not why?

 

[TonyTheTiger]

Yes. 6x45 and 25x45 Sharps.

 

[Laseredge]

https://en.m.wikipedia.org/wiki/6×45mm

 

[srt-4_uk]

And they are easier to convert. Just run them through a sizing die.

 

[10ring1]

The 6x45 looks interesting. Are they used often? Don't see alot of mention about them unless I just never paid attention