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Never tried it but you are talking about a 50% increase in muzzle velocities. What are the chamber pressures on those SMC loads? I saw one article from a guys using those in a 1911 who said if he were to shoot it regularly he would probably switch from his 18lb spring to a 22 lb spring.
 

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Is my pressure calculator correct? a 230gr bullet moving 1200fps generates over 33,000 psi! A 185 gr moving at 1400fps produces over 36,ooopsi!! WOW!!

So what are TAC barrels rated for???
 

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Is my pressure calculator correct? a 230gr bullet moving 1200fps generates over 33,000 psi! A 185 gr moving at 1400fps produces over 36,ooopsi!! WOW!!

So what are TAC barrels rated for???
this is purely my opinion:

those calculators do not do a good job of actual burn rate estimation. it depends on the powder being used case internal volume seating depth primer etc. only real way to tell is using a pressure test barrel.
 
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