[FONT="]Poor performance of the Model 41 is often blamed on the brand of ammunition, when in fact it is the special features of the .22 Rimfire that are often overlooked.[/FONT]
[FONT="]The case is parallel and the same size as the projectile's driving band and only the mid-section engages with the barrel groves.[/FONT]
[FONT="] This feature creates a small, reduced diameter between the crimp and the band, which on discharge allows interaction between the hot gas and the feathered edge of the crimped bullet to melt, which aided by the wax coating of the bullet, acts as a flux to deposit a ring of carbon and lead to the chamber wall.[/FONT]
[FONT="]With successive firing this build up will prevent subsequent rounds from seating properly against the breech face, which in turn cushions the impact of the firing pin and causing a misfire.[/FONT]
[FONT="]Don't expect to see this build up with the naked eye, the barrel may look clean, but examination with a magnified borescope will show otherwise. Regular cleaning of the chamber area after every few hundred rounds fired will keep your Model 41 happy with a wide range of ammunition brands.
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[FONT="]A few photos to illustrate:[/FONT]
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[FONT="](1) The cartridge (2) Relatively clean barrel (3) Carbonised cone area (4) Minute lead deposits.
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