Cowboy bullet. Unless you know you need smaller (e.g., .427"), most should get the .429" or .430" diameter.

In the box of 500, bullets may rub against each other causing some mess and minor loss of lube in the grease grooves.

Many Black Power shooters like to experiment with their own lubes. Save $25 per box by ordering unlubed & unsized bullets in boxes of 500. Although they have undergone a preliminary inspection, unlubed bullets have not gone through the final QA inspection and a few may have minor flaws.