I had very similar problems with mine. Jammed more with 38s but had some jams with 357 also. After several hundred very frustrating rounds I returned it to Henry (they sent me a prepaid label). When it was returned it functioned great.
After about 100 rounds it started having light strikes. It turns out the trigger bar was not striking the firing pin correctly. The bar was distorted at the tip, and the pin was mushroomed. Back to Henry.
They replaced the bar and pin. After 17 rounds the bar was distorting and the pin showed signs of mushrooming. The bar was barely hitting the pin on the tip again. Back to Henry. They said they would replace the gun.
They returned the gun “repaired”. I like the gun and would have been happy if the repairs had worked. The bar, hammer and pin were replaced and worked properly. However it will not cycle rounds. The extractor will lock onto the case and it must be pried out. If you work the lever hard enough to eject the round, the lever jams open and two rounds try to feed and jam requiring a screwdriver to remove.
On the rare occasion a round is fed and the firing pin strikes the primer hard enough to fire the round it is a fantastic shooter! I can hit a 4” paper plate 90% of the time (the other 10% is my eyes, nopt the gun). I have now been waiting for 4 days for the 4th shipping label. Henry says it will replace the gun this time (this is what I was told on the third return).
The gun will have spent more than 2 1/2 of the last 11 months waiting for transit, in transit, or in repair. The remaining time was spent in the safe or a few frustrating hours on the range.
Please do not misunderstand and think I do not like Henry. I own two flawless 22s (h001 and GB). I have and will continue to recommend their 22s to friends and family. However, I am beginning to regret purchasing the Big Boy. Hopefully they actually replace the gun with one that functions this time.