Unsupported case

[Doug Beach]

Looking at relatively modern actions, for relatively modern rimless cartridges, there are varying amounts of unsupported case required for everything to fit together and function, for instance a Savage at ~.130+, a R700 at ~.155+, and a T2k at more still. Measuring a handful of cases new and old, I find web thicknesses of ~.175-.200+.
Obviously you don’t want more case protrusion than necessary.
My question is, how much solid web must be inside the chamber? Is a .175” web protruding .165” safe, etc.
I’d like the thoughts of anyone with a background that precludes guesswork.

 

[Dusty Stevens]

Seems like any web in there works fine. Ive never seen one blow out in a supported area (within reason- not stupidity) but ive never done one on purpose that wasnt supported. Lots of pistol chambers are not supported

 

[Ggmac]

Most cases have enough brass to the depth of the primer . Early PPC cases had a ballon head almost and gave headaches in some actions . Of course this was early in use when all that was available had to be formed from Russian ammo . The dr Lou had some made (cases ) that proved too soft , if I remember correctly.
Anyway, most prints give a reading at .200 as a measurement spot for expansion, again if I remember correctly.