They are the standard 45LC HKS 25-5 speedloaders, dremeled to fit. Interestingly, Fiocchi MK II brass fits the best, seems like Hornedy rims are ever so wider. As such I am not sure you would have enough material left on the speedloader walls to dremel to fit Hornedys. I can't speak for other types of MKI brass. I have altered 4 speedloaders(about $9 a piece), all drop 455 rounds perfectly.


















































