270wsm sub sonic unique powder

adosland

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Victoria
Any recommendations on sub sonic loads using cast bullets and unique powder?
Looking to produce a Grouse hunting round that I can use while deer hunting.
I'm thinking 12-15 grains should work.
But wondering if someone has insight.
Thanks
 
Think I did that many moons ago. Think I got erratic ignition with unique so I went to trail boss. Used 12grains of unique with 1 to 3 .457 balls in a 45-70 case and a load of shot topped with a 457 ball for some odd looks at the range.
 
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