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I own a large frame H&A that I rebarreled to 50-70 I had to make a new extractor and silver soldered the barrel shank into the receiver. I also have a Merlin & Hulbert small frame in 22 rf that is nearly the same as a H&A m 922.
I have rarely seen a medium frame for sale and the ones I have seen have been in poor condition. Being your rifle has been modified and not really a collector gun I would see if you could get someone to just fit a used take off barrel for it as all you would be loosing is the barrel markings and would have a lot less money in it. I would probably make it a 32 S&W long or maybe a 32 H&R as you can use about any 30-32 cal barrel and they are a dime a dozen used.
Just my 2 cents.
Jedman
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A replacement barrel should certainly be on the table. One of my 822s is wearing a repurposed Marlin 60 barrel. Nobody notices until I point it out. (Probably because nobody has ever seen an 822 before!) It shoots like a modern rifle, although I limit it to Subsonic ammo. Not a very robust action, is the 822.
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Oh yeah! The idea of using a 30 caliber barrel and chambering it in it in 32 h&r is in the works on my end. Have used the chamber inserts on a mosin nagant, and it's the ideal approach for a"whisper" rifle. Have a friend who even suggested doing the chamber in 32 Federal, but I don't think I'll go that far. At any rate, fiddling with very heavy for caliber loads out of a long barrel with ridiculously small powder charges can tickle your funny bone.
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As I think I already posted, the rebounding hammer of the H&A makes it unsafe for high pressure. Since the hammer does not back up the firing pin, burst primers are a certainty. "Whisper" loads with heavy bullets work by creating a short pulse of very high pressure at the beginning of the bullet's travel down the barrel.