Last Round jamming, feed lip adjustment

[rickv100]

Here are some photos of the Lee Enfield jamming.

Rick

Nose up on the last round



Bolt brought forward resulting in last round jam.

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[Seaspriter]

Here are some photos of the Lee Enfield jamming. Nose up on the last round

RickV100
Thanks for the pics on the last round jamming. I took a look at three No.4's that I have in my collection that feed perfectly. From what I can see, your feedlips are far too wide spread. The photo below will show you how mine are set (others please chime in if yours are substantially different -- I'm not the real expert here)

Here's what happens as you close the bolt:

First, the bullet nose begins to move under the feed lip, holding the nose down. As it does, the feed lip directs the bullet nose into the funneling slide at the bottom entrance to the chamber.
(Rick, from what I can see, your feed lips, being too spread apart, are releasing the nose far too early, causing the cocking of the bullet into the side-wall and jamming.)

Second, the bolt moves the cartridge forward and the neck of the cartridge (~.335" diameter) escapes through the feed lips (~.345-.350" apart). At this stage the point of the bullet has already contacted the funneling slide and is being guided to enter the chamber. (I checked another mag and the feed lips were .40" apart. The last round fed ok using a quick, snappy motion. But if I slow-motioned ramming the bolt home, it cocked just like yours.)

Third, the taper of the cartridge then rides UP on TOP of the feed lips as it enters the chamber. The nose of the bullet should already be inside the chamber at this point. The bolt then finishes driving the cartridge home.

Notice, (see photo) the right and left feed lips on my mags were not diametrically the same height -- the right feed lip is lower than the left. (I don't know if this is a coincidence or by design, but all the mags I tested exhibited this trait.)

Hope this helps, Robert
Please PM me if you need to talk this out.