Beaumont Extraction Issue

[rescuerandy2]

Good Evening. Got the new Beaumont to the range today and did some nice shooting. However, rifle failed to extract the spent case every 2/3 cycles. Cases do come out easily by hand/screwdriver and they are 50-90 formed cases. Suggestions. Thanks, Randy

Information

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[Patrick Chadwick]

Possibilities:

1) the extractor is badly worn, or just plain crudded up in the corners, and has effectively lost its "hook", so that the extractor is slipping over the rim

- visual check with a watchmakers eyeglass.

2) the chamber has a local depression (old rust pit), and is holding back the expanded cases so much that the extractor is slipping over the rim

- visual check for "bumps" or rings on the fired cases. Measure and compare with unfired case.

3) the case is a touch oversize, and is being rammed in by the bolt.

- careful measurement of case and chamber/fired case.

Quite possibly a bit of all three!

[rescuerandy2]

Thanks Patrick. Hook is fine, no depressions in the chamber, and cases measure OK. Still at a loss to figure it out but it is a beautiful shooter. Randy

[jmoore]

Seems to me that the rims are roughly 0.020" smaller in diameter, but actual measurements from your reformed cases might help.

[Patrick Chadwick]

I think jmoore is correct.
I had overlooked (jet lag!) the simple fact that the cases are reformed 50-90s, which means that not only is the base diameter clearly undersized for the Beaumont- so hardly a cause for jamming in the chamber - but the rim is also undersized, making it much easier for the extractor hook to slip over the edge.

Solution?
Use reformed 470NE cases - if you can find any at an acceptable price.
Maybe make up a replacement extractor with a longer hook? Basically a dead slow cutting and filing job. But you only have to do it once.
If you are not worried about altering an original part - weld a spot onto the present hook and file to shape to make the hook longer. The extractor will then almost certainly have to be remempered.

I would go for a D-I-Y replacement extractor. The low-risk, low-cost solution.

[rescuerandy2]

Gentlemen, spent a day at the range on Sunday and the Beaumont worked great. Cannot explain but will send rim measurement tomorrow. Thanks, Randy.

[jmoore]

Second use brass or freshly reformed like before?