I also shoot a LRH and there is no .25 ACP breech plug available. You can however get the variflame adapters and use the small rifle primers. Before you do that consider buying the power stem breech plug and use loose T7 powder,this is very clean set up using remington 209 muzzleloader primers. I'd also like to mention cheaper and very accurate. Look at this photo. I have shot several groups like this one using this set up.