Lee 12G 1oz slug recipes

legi0n

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Burnaby, BC
Got some lead and a Lee 12G 1 oz mold.
I plan to reload 2.75" Win AA hulls with pink wads.
I do have a recipe using Hodgdon's HS-6 but I own twice as much Alliant Unique.... so I'd like some Unique recipes for this 1 oz slug.

From the burning charts Unique is very close to Hodgdon's Universal.
 
Not having trusted data on Unique, I'll try working up a load starting at 21 grains. But how do I measure the muzzle velocity?
Too close the chrony and the wad screws the reading, too far and it's no more "muzzle" velocity (not counting the high chance to hit the chronograph...)
 
I Chrony 12 ga slugs at about 10 feet without problem.

I just tested some of those slugs with 25 gr of Unique and got 1000 fps. I was making a milder load for 3 gun matches.

I knocked down my chrony and given the tiny dent it could only be the wad. So I'm not really eager to try again :(
But 25gr seems to be a good starting load.
Thanks.
 
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