Good attempt at not answering, but not good enough. 20K was just a nice round figure, make that ANY pressure you like, suit yourself.

The actual question was, if you sleeve the original chamber, what will be the difference in how much pressure it will hold. For that matter how much difference will there be in the amount of pressure required to Bulge a chamber assuming one of chopper lump & the other of mono-block construction, both having equal wall thicknesses.

It appears to me you are trying to condemn sleeving on a safety factor, If this is correct I would like to see factual figures which bear this pout.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra