really weird chambers

[Sieger]

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by G. van Vlimmeren:
<strong>Hi Tom,

It does, as the stepped design allows for effective sealing of the front portion of the chamber. It offers the same sealing ability as on bottle-necked cartridges and prevents gases from escaping past the neck of the cartrigde.

So less fouling, less chance of the cartrigde getting stuck, thus better and more reliable extraction.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">I agree completely with the sealing theory, and when using slower burning powders, this step does seal the chamber quite effectively.

Both my 1917 DWM and my 1941 byf have the step in the chamber, but my 1970s' Mauser Parabellums do not have the step.

It appears that the chamber design was well thought out and executed in production. Now if I could only figure out why .358 grooves were used with .354 projectiles?!?

Sieger