H414 is nothing more the Winchester 760 powder re-labled as H414 by Hodgdons and 760-H414 require magnum rifle primers. You are not getting good ignition and most likely a bad pressure curve.
RL-15 is now loaded in the military special long range ammunition and is also a double base powder.
Prior to this the Special Long rang ammunition was loaded with WC750 which was a special blend of Winchester 748 ball powder.
Varget and RL15 would be top choices for single and double base powders.
Note: Over half of Remington Dupont IMR powders are made in Australia by ADI
[img width=600 height=434]http://i122.photobucket.com/albums/o254/bigedp51/ADIpowder.jpg[/img]
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