I posted a response, but it seems to have disappeared. Maybe I revealed too much of the "top secret formula"?
Romano Spencers come with either a Hoyt barrel or a Douglas barrel. Mine has a Douglas barrel, and I was initially underwhelmed with the accuracy for the price. Then Larry Romano told me the secret--linotype. The Douglas barrels need rock hard lead to shoot well. Wheel weight alloy is just too soft to get the job done, and bullets cast from wheel weights will sometimes keyhole.
So, I got some super-hard bullets from Liberty Bullet Co (sadly they've gone out of business), and suddenly it was like the choir of angels sang. The gun shot great, couldn't miss a pigeon for trying. Their alloy was 19 parts linotype to 1 part pure lead. I've made up some of that alloy myself, and got good results useing the Romano mould.
You might want to try a slightly longer bullet, too. I got even better results with a slightly heavier bullet from Liberty Bullet, but I don't know what mould they used, and now I can't ask. But I think the longer bullet compressed the charge a little more and gave better ignition.
So the load recipe that has worked best for me is:
Brass: cut down .50-70
Bullet: Romano Spencer mould cast in 19:1 Linotype alloy
Powder: 40 gr. FFFg GOEX
Primer: Lg Pistol (Not Magnum)
No wads or filler.
The difference was like night and day using the right load.
"Stay on target...stay on target..." Red Leader, Battle of Yavin
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