I recently acquired an
insert made by Krieghoff about 40 years ago. Unlike the Keppler Inserts I am familiar with this one is only about 15" long and has no centering cone on the end of the 22 Mag rifle barrel. It has a key and adjusting screw that moves a relatively large pressure pad up and down on a threaded screw so I think I have figured out how this roughly works. If not properly adjusted the action does not want to close with the
insert in place. The proper relief slot is cut in the right 12 bore extractor to accommodate and align the extractor on the
insert. There is also three smaller screws and pressure pads on the
insert that look very much like they are intended to adjust the POI for the
insert. While this is all good and well, I am still having trouble understanding how the barrel stays properly centered in the bore when there is no bore diameter bushing on the end of the barrel to locate it accurately in the bore. I am used to the types of
insert Krieghoff and Keppler currently produce and these are of barrel length with one or sometimes two or three locating bushings on them, depending on caliber. I have attached the link to Keppler that illustrates the modern types of inserts.
The
insert I just got looks just like the small one in the picture with the Krieghoff drilling below. Any and all info on how to properly install and align this
insert would be greatly appreciated. I would particularly like to know if there is in fact a centering cone required and it is just missing from the picture. Also, if anyone have a copy of the operating instructions they could scan and send this would be very much appreciated. Thanks.
http://www.keppeler-te.de/cms/pages/englisch/hunting/insert-barrels.php