277 cal off the 243 Catbird cartridge?

[Jazz]

Looking for any info if anyone has done this. Using the 243 Catbird as the base and necking up to .277 cal. Thanks for any info.

 

[mattri]

Isn't the catbird a 30-06 necked down to 6mm? If so, necking it up to 277 would basically be a 270 Win wouldn't it?

 

[Jazz]

No, it's a blown out 270 win case with a 35 degree shoulder.

 

[mattri]

So a pseudo 270 AI?

 

[Jazz]

Yes, probably one of the many improved variant styles. Any thoughts on this or personal knowledge of this type of round? There is a guy on another forum who does the Sherman round, I'm sure this is similar but his has a 40 degree shoulder.

 

[ChrisNZ]

My thought was "Why bother?"

A .280 Ackley is far more flexible and there is good commercial brass available

Chris-NZ

 

[Jazz]

Probably because I can't make a 280 A.I. from a 277 barrel that I have! Sorry, if that came off as a smartazzz, I should've explained that I had a .277 barrel first.

 

[270guy]

Probably because I can't make a 280 A.I. from a 277 barrel that I have!

Then why not just AI the .270?

 

[alf]

Or Gibbs........

 

[p17enfeild]

hi Jazz
do you have .243 catbrid reamer? if yes then id just get a .277neck and thraot reamer for ptg and do it , if not the 270ai would be chaeper bet
and thay are more or less the same thing

 

[Jazz]

Yes, my gunsmith has the catbird reamer, that's where I got the idea. Thanks for everyones opinions.