I tried twice with the same magazine to feed the HP with no success. It was extremely difficult to dislodge the jams, I mean difficult so I stopped. Ejected the HP ‘s from the magazine and inserted round nose without a racking problem nor in past firing problem thereafter. Decided to seek the forum for thoughts rather than trying 3 other magazines on hand. Although I must admit I wondered if the magazine spring might be weak and need replacement? I Will be at the range this week and try again to rack a HP from a different magazine. It actually took a screw driver to raise the HP up from the bottom of the feed ramp which then did feed. Obviously I can not repeatedly go through this.

Perhaps new springs are needed? Would you know who is a supplier? Thank you for your reply an a possibility toward resolution. I’ll try anything for I love the gun.

I use Gold Dot 124 and have done so for years with no problem racking or feeding.  Wish I could help.

Interesting concept.

Lot of discussion on the internet as to whether or not a convicted felon could own this.  Since it's not considered a 'firearm' by the ATF.

I might be interested in one, as I like unusual things, but would probably get a Pedersoli Howdah first.

Muzzle loader pistol with break-open to load the primers.

It is hard to follow your problem but it sounds like it may be a magazine issue. Have you switched magazines?