[IllinoisCoyoteHunter]

45 acp is a lower pressure round and a softer alloy can be used. If you use too hard and alloy, the boolit will not abturate to seal the bore proeprly which can lead to leading. What kind of lead do you have access to? Wheelweights? If so, WWs work fine, air-cooled. A better alloy would be 50/50 WWs/stick on WWs. The stick on WWs are close to pure lead, therefore much softer. Generally, the more lead there is in an alloy, the heavier it will be. Alloys with higher antimony and/or tin content will drop a lighter boolit. You can buy a hardness tester from Lee....they are like 50 bucks. The lyman manual is a must for beginning casters. Good luck!