Most 3/4 oz MEC 502 bars actually throw just under 11/16 oz magnum #8.5s. Agree with the 13 gr GD charge, I have gone as high as 14 gr for 5 stand. You can use old-style comp-formed AAs, STS, or GCs interchangeably. If you use new AAs you will give up about 35 fps. Best wad, IME, for the comp formed hulls is the OEM WWAA20. You should not need to make any press adjustment, nor will you see a need for filler using this wad.
I do not know pressures on this load. I do know the load parameters are below published 3/4 oz data that is available. Factor in the sub-11/16 oz payload, too.
The load will not cycle either of my 391s. If you substitute 14.5-15 gr Unique you ought to cycle most 1100s, and usually 391s (except in January!). Port pressure is what matters to gas guns.
Sam
ETA, 11-12 gr Promo/Clays/RD works great with a 5/8 oz shot bushing (which actually dumps about 9/16 oz). But be advised you may wish to use filler. Some don't like filler. I've loaded tens of thousands of these weenies using 1-2 kernels of puffed rice on top of the shot. You may need to make some small press adjustments to get crimps right, too.
Last edited by Samuel_Hoggson; 03/01/10 02:08 PM.
