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John, thanks for adding to the thread.

I must not have had my preferences set to notify me, thought it fizzled out.

Only reason I noticed it was because I was searching 32 caliber barrels and...

I've got an entire notepad dedicated to an UnderHammer flintlock.

The thought of one in a nice squirrel caliber makes me tingle.

I've been shooting them in one form or another for about a decade and hadn't had one slip off yet.

There's enough taper on the nipple that the cap holds fine.

I did have one nipple that was a...

I can't take credit for that; it's been a thing for quite a while, they just aren't popular.

About the only thing ingenious about the concept is man's desire to make things go boom, as simple as...

54 CAL muzzleloader based on of a Billinghurst Underhammer action.

Barrel is a 36 twist to throw maxi-ball type projectiles.

Aside from the screws, butt plate, rear sight, and barrel,...

Built some from kits, but I decided to build one from whatever I had lying around.

Here's a short video of the action, and the nearly finished product - still have to sight it in and file down the...

That's what I need, chief. Wider is better....

I got my Lee Loader for the 44, and took the 5 rounds I've test shot so far and did the magic voodoo on them. Made a custom powder measure out of a 7.5x55 piece of brass (because that was the 1st...

Since very few have seen this gun in operation, information on it is kinda lacking.

So, during repeated fire shooting, I was pleasantly surprised of this little quip of working the action....

...

Without a doubt.

I'll shoot some groups this weekend perhaps if the wife permits. The inset pic is a internet photo, but the one I have is in that good of shape or better.

I had swore off...

An Allen Wheelock drop breech in 44 Henry. Aggressive 25 twist, 430 groove, 411ish bore. 3 lands and grooves.

205184

Converted the breech to centerfire from rimfire using Uncanny American...

I got it because a friend of mine wanted to do antelope in Wyoming, and in my mind, nothing says, "dead antelope" like a 6mm. Why I don't know, but that's what came to mind.

But he knocked up his...

I picked a 6mm LH a while ago and finally resigned myself to do load development last week.

Got out all sorts of powder, all sorts of bullets, took it all to the picnic table.

Consulted...

Regarding the underhammer, if you got molds, you got a lead pot. And tempering the spring would be easy at that point.

Mine has a 3/4" diameter hole in the receiver on the stock, and the...

I've been in this situation before. Have a mold or a metric **** tonne of bullets and need a gun to fit.

Get a .458 barrel, breech it and build an underhammer.

202813

Due to molds on hand,...

Yep, 35gr.

I also have a box of the little seen 50gr HP, which I assume are used for elk.

I was thinking of converting a single shot handi rifle, or some other such platform.

Mr. William, that is some neat stuff. I have often thought of wildcatting a 251 cal, because I have 700 plus 251 xtp's laying around in my stash and no longer have a 25 ACP.

For the record...

And doing more investigation on chamber dimensions versus cartridge dimensions, John, I believe you are right. The 44-40 will fit it better, and the bottle neck, albeit a small one, will facilitate...

A steel framed Ethan Allen drop breech. (Allen & Wheelock)

I mention steel because some were made in brass.

All were originally rimfire actions, but chambered in 44, 42 and some in various 30...

Well aside from taking a precaution to stamp the barrel "BP only", I believe my wife will bury me with my projects, so the concern is moot.

slugging the bore gives the 0.428+/- and 0.418+/-.

Kind of made me thought it was a 42 allen rimfire, but that would have been a way oversized chamber...

Of course, swagging a lead bullet in...

Here's a chamber schematic from a cerrosafe mold I made from an old barrel.

It's probably a 44 Henry rimfire which had a case length of about 0.9" and an OAL of 1.345" with a 0.446 heeled bullet....

Part of my ongoing saga to get a Kodiak Express with a tight bore shooting.

I have a maxiball mould that spits them out at .542. Thing is, I have a bore of .532 and groove at .542.

Looking at...

Thanks sir.

Bees wax alone, or reduced?

My supply of BW is a tub of what looks like itty bitty wax granules.

so far, no signs of leading, but I've only got a few down.

It's a Pedersoli Kodiak Express SxS, and I need to get serious about a load, but I need to work the kinks out of production first.
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