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+--- Thread: Make your own scale model M-C 91/38 bullet for comparison. (/thread-12513.html)
Make your own scale model M-C 91/38 bullet for comparison. - Drew Phipps - 02-05-2014
Using Bob Prudhomme's fine historical and ballistic research in his threads, I have contructed a scale model bullet for the M-C 91/38. This model is accurate for the original Italian mil-spec ammo (as accurate as digitally possible for me anyhow). The rifling marks are (per Bob) the correct relative size and reflect a stock M-C 91/38 4 land/groove rifling spin rate. If you are a purist and want to shoot for a WCC 91/38 round which is .004 inches less in diameter, you can roll it up a hair tighter.
Print out this .jpg:
[ATTACH=CONFIG]5948[/ATTACH]
copyright Drew Phipps 2014. You may freely use this image in any not-for-profit activity. Excepting only that you may not use or publish this image in any book, magazine, news, or television show without the express written consent of the copyright holder. And you must also thank Bob Prudhomme for his hard work.
I used 1/4 of a page of 8.5x11 sheet of paper. Cut off white sides 1, 2, and 3. Leave some room for glue on side 4. Apply glue to side 4. Roll side 4 under and apply to the back of the paper, matching the printed edges. Voila!
Now you can compare with the published photos of CE 399. This model shows all the "class characteristics" that a forensic examiner would use to match a fired bullet with a particular TYPE of gun. You can see for yourself that the lands and grooves don't match (especially on one "side" of CE 399), and that the images of the object marked CE 399 demonstrates a higher spin than it should. Forensically, CE 399 should have been EXCLUDED as a bullet shot from a M-C 91/38.
Sorry I couldn't do anything with the nose; I have neither the calculus nor the origami skills to approximate the curve of the nose of the bullet with a paper scale model.
Make your own scale model M-C 91/38 bullet for comparison. - Bob Prudhomme - 03-05-2014
Excellent, Drew!