Gunsmithing Feed ramp dimensions

[MrSmith]

I am rechambering an AR-15 for a wildcat. I have looked at the feed ramp shapes of different cartridges. At the moment I'm leaning toward cutting the ramps slightly over the diameter of the straight wall case at 45*, 22.5* each side of center. Is there a design method or "rule of thumb" for shape and size.

Thank you,
MrSmith

 

[B y r o n]

Maybe this thread will give you a better idea of what you need to do.

 

[MrSmith]

Can anyone post a picture of the feed ramps for a .338 dia. projectile?

Thank you,
MrSmith

 

[B y r o n]

This maybe what you're looking for.

Or maybe this:

Which is actually a 350 Legend barrel extension.

 

[MrSmith]

That's what I needed. I'll mimic the 350 Legend and see how it works. If needed, modification to the Tromix configuration would be simple.

Much appreciated.

Thank you,
MrSmith