winchester model 100
- Thread starter brownie
- Start date
the primers are backed out a bit on the fired cases.
home loads.
I keep wanting to add some more advice, but you're being too stingy with the info. But I'm not gonna type up all the possibilities and the ways to correct each of those possibilities.
~ Determine if there in a problem with the rifle, a problem with the ammo, or a combination of the two.
~ Check headspace with headspace gauges.
~ Check the reloads for correctness.
Headspace is checked by using factory manufactured steel gauges.
Anything you do with reloads have to do with how much you size the shoulder back creating excessive case head clearance.
Case head clearance can be altered to correct slight headspace problems with the chamber... but my guess is the headspace of the rifle is within tolerances and your reload is outside of those tolerances.
Anything you do with reloads have to do with how much you size the shoulder back creating excessive case head clearance.
Case head clearance can be altered to correct slight headspace problems with the chamber... but my guess is the headspace of the rifle is within tolerances and your reload is outside of those tolerances.
you guys are getting off track here guys.
the question was, is excessive headspace a common problem for the model 100??
Brownie
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In actively working as a gunsmith for over 45 years (part of that time as warranty for Winchester) I can say it is uncommon to have a headspace problem on an unaltered factory 100.
As previously stated primers popping back a bit are not necessarily a headspace problem. They can be entirely a case head clearance problem.
thanks for the answer. I have two model 100,s and both have been checked by our friendly local gunsmith and both have excessive headspace.
if it weren,t for bad luck, I would have no luck at all!
Brownie
The bolts should close freely on a steel go gauge and should not fully lock up on a steel no go gauge.
If you are a hand loader it is very easy to adjust your case head clearance to compensate for the rifle's excessive headspace. You may have to create a false shoulder by sizing the neck up for best fire forming.
My apologies, I though you were looking for info and advice. But it seems you just want the single question answered.
My answer is ~ No
Primers backing out is a sign of excess pressure, not excess headspace.
If your two rifles are deemed to have excess headspace, is there any chance the bolts got swapped? While cases don't have headspace, rimless cases can be adjusted by sizing to move the shoulder to adjust headspace.
No neck sizing for a semi-auto. FL is required.
If your two rifles are deemed to have excess headspace, is there any chance the bolts got swapped? While cases don't have headspace, rimless cases can be adjusted by sizing to move the shoulder to adjust headspace.
No neck sizing for a semi-auto. FL is required.
Primers backing out are a sign of excessive case head clearance. If the shoulder of the case held the back of the case against the bolt face, the primers could not back out. If allowed to, primers will back out with no powder at all... so pressure isn't the cause of primers backing out.
If the two bolts got swapped and they were of different dimensions, one rifle would have excessive headspace and the other would have less headspace than required... but who would strip two 100's that far apart and mix the parts up?
gunrunner100
CGN Ultra frequent flyer
- Location
- NW Ontario
Bolt head should be stripped of ejector and preferably the extractor. With a rotating bolt head such as the Model 100, 100% rotation can be difficult to distinguish.
I agree with Dennis, I think it's a clearance issue, not headspace.
