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SKB #561559 12/30/19 10:21 AM
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If we are considering wildcats now, has anyone thought about 6.5-284 ?For the "life of me", I can't imagine anyone rechambering an early Mauser to any wildcat, muchless 6.5-284;but it was popular, for a while, with people chasing it around like they are doing the 6.5 CM now.
Mike

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How about one of the .257 Roberts?
.257 Roberts
.257 Roberts AI
6.5-.257

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No, no, no The base diameter on those cartridges is 12.01mm or .473", much smaller than your chamber 12.3 or .484", a 6.5x57 is even smaller at 11.9mm or .469",this is what makes me believe you have an over polished chamber.

Your issue is the diameter of your chamber at the base and at the point of the bulge is larger than your brass by more than tolerances allow. Some of the brass when pushed this far is failing. I converted the measurement in MM to inch and can not find any cartridge to match. Do you have a micrometer that measures in inches? The chamber should only be a couple of thousandths of an inch larger than your brass. As mentioned above, this is very dangerous.

Last edited by SKB; 12/30/19 03:06 PM.

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Sidelock

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Yes I have a micrometer that measures in inches.

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A very accurate measurement taken at the base with your micrometer will help.


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SKB #561614 12/30/19 04:56 PM
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The base diameter of 6.5x55 Swedish is listed as 12.1 and the chamber would be larger than that( in Europe),but as mentioned before, American factories commonly make cases with 06 size head diameter without obvious problems. I think a chamber cast is necessary, even if you have to pull the barrel to get a good one( measuring case length would still be tough).
Mike

Der Ami #561616 12/30/19 05:11 PM
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Could be a 6.5x55, I looked past it due to length but with the difficulty measuring it you may be on to something.


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Sidelock

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Ill bite the bullet and buy some headspace gauges also. I really want this rifle to work. What gauges should I get? No-go, go or both?

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I can take a bullet out of a 6.5x55 and try a fire form and we can see what happens. Or is that a waste of time?

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Headspace gauges are not needed until you are sure of the gauge, they are quite expensive. I have quite a few and could lend you some if I have the caliber you need.

Firing form a 6.5x55 case sounds like a very safe option that should give you some valuable information. You will want to use a fast burning powder when you fire form.

Last edited by SKB; 12/30/19 06:51 PM.

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