I have a 1874 Sharps in 45-70 that Im interested in shooting and have talked to several of these shooters and they suggest a 20-1 alloy.i looked at a alloy hardness test i found on another thread and noticed the hardness for that is about 11 BRN hardness.Is wheel weights about the same hardness? Couldnt i just use wheel weights and achieve the same thing or am i missing something?