I've killed several deer with the 30-30 and cast bullets. I used the Lyman 311041 mould and heat treated the bullets by dropping them in a bucket of water right out of the mould. This is explained in the Lyman or RCBS Cast Bullet Manuals. Load I used was 26 or 27 gr. 3031 depending on my mood while loading. Never had one run more than 30 yards, and on one buck nearly facing me, I dug the bullet out from under the skin on his off hind quarter. He just went over backwards and never moved. Finally got rid of the old Winchester though, I got spoiled on the triggers on my varmint guns and couldn't get used to that heavy trigger pull.