Forwarded response from Herb Tobben at Clemco:
Hi Jack Champaigne,

This is unusual, I do not recall ever working with a Shot Peening application using S-780 shot.
S-550 shot is the largest that I recall using for Shot Peening.
The lance would have to be special made, I would suggest starting with a minimum of one half inch I. D.

Herb Tobben
Technical Services Dept.
CLEMCO INDUSTRIES CORP.
One Cable Car Drive
Washington, Mo 63090
[email protected]
PH: 636-239-8172
www.clemcoindustries.com