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Larry,
I also use the RCBS mold mentioned and like it---my favorite load with it is 8.5 W-231--I get 1,125 FPS with it and it is very consistent and accurate. I was trying to develop a milder load to use with my old Lee 205 SWC mold and though Bullseye woudl be ideal as I can use less powder.
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I got the chance to test out the Lee 200 grain SWC bullet with 6.0 grains of Bullseye. It was not to accurate at all despite a beautiful 11.00 Std deviation. Such a shame. However the bullet works well with ~ 9 grains of W-231 or HP-38.
Using the 6.0 grains of Bullsye I had many wide flyers which is amazing as the .41 Mag is intrinsically accurate with just about any load.
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You might email John Taffin, or check his website(sixguns.com IIRC) for info on the .41 Special.