« Reply #4 on: March 20, 2012, 06:19:45 PM »
+1 GENDOC,
SAAMI Max. Ave. for 410 2.5", 12,500 PSI, 410 3", 13,500. 45/410 barrel is a shotgun steel barrel. 45LC is 14.4K as Doc said.
Published data, by Hodgdon, for Trail Boss in the 460 S&W Mag has pressures (PSI) from 16,500 to 24,200 PSI.

Hodgdon has also published data for Trail Boss in rifle cartridges with pressures well in excess of 40K PSI. Trail Boss is a low velocity/low recoil powder, it seems to be given credit for being a low pressure powder but the manufacturer's data doesn't support this.
BB

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