Does lead hardness matter significantly if one was going to assemble 45 Colt cowboy loads under 850 FPS using a Lyman 454190 bullet? I have a random mix of probably 50% wheel weights and scrap lead, and was wondering whether this would work ok or whether only very soft lead should used. These will be used in a repro .44 cal Remington 1858 and a .45 Colt conversion cylinder. Appreciate any comments, particularly if there is another bullet I should consider. Thanks.