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I'm going to give this one last shot--to attach the article on martial metrics from the Practical Machinist. Nope!

If it fits, use it. As you can tell, this whole issue is murky with even a mix of metric and fractional thread forms being used. I believe the metric equivalent for 5/16 x 20 nipples used on some reproductions is 8 x 1.25. Is there a metric equivalent for 5/16 x 24? Don't know. Anyway, the...

Hawkeye--I'm going to make one last try of posting the Practical Machinist article. If I don't succeed, I'll depend on your superior computer skills to post it to this forum. Nope, didn't work. Weird, I can attach the file to an e-mail but cannot even bring the file up on the desktop when I try...

Hawkeye--I e-mailed you the article I referred to from the Practical Machinist on U.S. metric thread forms in the production of our early U.S. martial arms. Hopefully, you can post it here for all to read. It's about as succinct a description as I've come across.

Get me that e-mail and maybe we can get the white paper on US metric arms posted. In the meantime, we have found that the .250x28 nipples fit (adapt to) many antique European arms. The U. S. adopted the 60-degree thread of the metric system and as you begin to run into thread questions, it's...

Hawkeye--Probably the best source in a condensed form are the posts at practicalmachinist.com--a site which really digs down into historical thread forms. I'll try to attach a file from "Doc AV", which gets right to the point and also covers Zonie's issue about metric/inch combos. It wasn't...

Interesting observation but a faulty conclusion. The original martial "patterns" used by the U.S. were the 1766-1770-1771 French muskets using metric thread forms and the metric form continued to be used in U.S. martial arms production. The question becomes "when" did the metric system fade...

U.S. martial arms were made with metric thread forms up until the adoption of the Krag. The change came when the Norwegians provided the manufacturing plans for the Krag in the inch-system.

Here's the end report. I ordered and tried a number of 6mm and 7mm nipples. None captured the thread form. Then, because many of the antique European percussion firearms I have handled, exhibited a thread form that was close to our 1/4"-28 nipple, I tried a Treso AMPCO 1/4"-28 nipple which is...

Thanks a million for all your "fixing" techniques and ideas. One or another will put this fine, little piece back on the firing line. This is what makes our forum so invaluable.

Good answer but how does one "Adapt" the gun to an available nipple?

Before using a tap, I would rather take an impression of the nipple seat and existing threads. Any ideas?

Just got a nice, old German half stock with a .52 caliber barrel. No nipple. Tried .250 and .255 diameter nipples but could not pick up the thread pitch. Without damaging the old nipple seat, how can you best determine what the thread pitch and diameter of the original nipple is?

Be sure you join one of the many fine ML clubs in AZ. I belong to the Old Pueblo Muzzleloaders in Tucson. We shoot every 3rd Sunday at the Three Points range.

I have a nice German half-stock, circa 1850-1860. It did not come with a functional nipple. The nipple seat still has enough remaining threads to be usable but it is oversize and will need an oversized nipple, Have not determined the thread form or the pitch, but did try .250 and .255 1/4-28...

I believe the concept is a carryover from the flintlocks which obviously had a vented barrel and were loaded with heavier charges than the percussions that followed. I can understand a builder making this decision during the transitional period from flintlocks to percussions.

Okie--I remember MDM. Alliant still thinks that was the best of the best substitute. I looked at my cans--no reference to APP. Are you going by the U.S. patent number?

FML--How did you determine that American Pioneer Powder makes Alliant's Black and Blue MZ powders?

whoa!! Colorado Clyde has piqued my interest with his comments about the Black MZ MSDS referring to Potassium Perchorlate rather than citric acid. ALLIANT has just introduced BLUE MZ, 50 gr. volume equivalent pellets. The factory packaging does not refer to the non-corrosive qualities of BLUE...

There's no contemporary percussion revolver tougher than a Ruger. Did you ever hear the story about proof testing the model. As I understand it, Bill Ruger and his corporate attorney, Steve Sanetti, were sitting around discussing the issue of how do you proof test the new Old Army model. They...