i have the parts for a 500 linebaugh, just need to take them to Gallagher's for assembly. one of my favorite quotes is by john Linebaugh and is dont load your little gun heavy,load your big gun normal. Whit, i am familiar with your pentration test work and refer to Big Bore Revolvers many times a week, sometimes more than I do Sixguns by Keith. It just seems to me that given the similarity between the six shot 458-400 and six shot 45 colt, that similar performance should be obtained.GlennS, I got to handle the birds head vaquero that he built and it was one of the coolest little guns that i have ever handled.