Tellin' a little squib

[Salmoneye]

Isn't h110
one of the powders in which you cannot reduce Never exceed By more than 3%
Due to unfounded phenomenon of over pressure/undercharge?

No...

You 'may' get exactly what the OP returned to share with us...

H110 needs a firm crimp, AND magnum primers for complete ignition...

From the Hodgdon site:

"For those loads listed where a starting load is not shown, start 10% below the suggested maximum load and then approach maximums carefully, watching for any sign of pressure (difficult extraction, cratered and flattened or blown primers, and unusual recoil). H110 and Winchester 296 loads should not be reduced more than 3%"



http://data.hodgdon.com/main_menu.asp

 

[BCRider]

On the H110 issue. I'd thought that the narrow window was because the powder is volume sensitive in the same manner as black powder. That is a loose charge will spike the pressure dangerously. But RC and others here corrected that idea. Instead it's due to the H110 being reluctant to burn. So unless the pressure is high enough the powder burns incompletely and inconsistently.

And as indicated by that one post where the powder didn't ignite there's something to be said for the extra pressure and flame from a magnum primer to ensure a good start along with a complete and consistent burn. Although some say that they get along just fine with regular power primers.