are you cleaning the gun between cast and jacketed loads?ARE THE CAST SLUGS GAS CHECKED.Try a harder mix,ww&lino, to see if that helps.Also look carefully at the crown of the gun for any damage there.
How do the slugs fit the throat and bore of your gun? this is a big culprit to bad accuracy.You may have to adjust your seater die so the bullet fits better. jh
I have a 44 mag Rossi that I shoot Cowboy silhouette with. I started my load development with a 200 gr cast bullet and even though I got an extreme spread with all loads of about 20fps, I just couldn't get it to group under 4 feet at 100 meters. I tried jacketed bullets and groups shrunk to about 2inches at 100 meters on the first try. I then went to putting a gas check on a cast 240grSWC bullet and it has shot great ever since.
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