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can you confirm that you used .44 mag in one of these?
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I have NOT used .44 Magnum factory ammo in the insert that I have. I used my own handloads and they were at .44 Spl. levels.
Accuracy....remember that the picture of the target - if that is what you are referring to - is not an insert used in a shotgun. It was used in a rifle.
The best experience, accuracy-wise, that I have had with an insert in a shotgun was with the aforementioned six inch .45 ACP insert. I have no target for that. If I was careful, I could hit a tin can at 25 yards. Never tried to see what benching would do.
Material - the six inch .45 is made from steel, as is the pictured insert for the Martini-Henry.
McAce is a source.
Also try
http://www.gunadapters.com/?gclid=CO...FZ065QodahVWEQ
These are made of steel. There are some videos at this site.
Pete