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Posted: 7/30/2012 4:49:11 AM EDT
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I am reloading some once fired Federal gold medal match cases. After FL sizing, I have a few cases that are very hard to chamber. I used the Sinclair bump gauge to measure these cases. I found that from the case head, where the extractor contacted the rim, to the shoulder was 0.001" longer than the rest of the case. There is a high spot on the case head that can barely be felt with a fingertip. Would it be ill advised to bump the shoulder back another .002" on these cases, or should I scrap them?
Also, any tricks to reducing extractor damage on case rims? I have an adjustable gas block but haven't even messed with it since I'm working up loads for this RRA LAR-8 rifle. |
| If your case head has a high spot on it because the rim has been dented why don't you remove the high spot? I can't see shortening the entire head-space because of basically a burr. What kind of full length dies are you using that you can adjust then down to shorten the head-space. Or do you purposely have them backed off some? Most shell holders have a little groove in them so it's easy to see how it is possible that the dent was in the groove when the case was sized so now it is too long. I would carefully file the dent off. |
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When I find some with the high spot on the case head during initial inspection, I put them in the wilson trimmer case holder, turn the case head towards the cutter in the wilson trimmer and give it a spin or two.
Then size and trim as normal. Works for me. I don't normally have many that require this. It can also be a real eye opener to see how much the case heads are out of square. Danny 
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Quoted:
If your case head has a high spot on it because the rim has been dented why don't you remove the high spot? I can't see shortening the entire head-space because of basically a burr. What kind of full length dies are you using that you can adjust then down to shorten the head-space. Or do you purposely have them backed off some? Most shell holders have a little groove in them so it's easy to see how it is possible that the dent was in the groove when the case was sized so now it is too long. I would carefully file the dent off. The high spot is from the extractor putting a pretty deep mark on the rim, more than just a burr. Also, I think you are correct about the groove allowing it to go into the shell holder. I've only got about 5 out of 200 that are bad enough to be noticeable. I purposely have my Forster die backed off a slight amount. It still cams over when raising the ram, but only slightly. If I run it down per the Forster instructions, I am bumping the shoulder back .006"-.007" on fireformed cases from my rifle. I want to achieve approximately .003"-.004" shoulder bump. |
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Quoted:
When I find some with the high spot on the case head during initial inspection, I put them in the wilson trimmer case holder, turn the case head towards the cutter in the wilson trimmer and give it a spin or two. Then size and trim as normal. Works for me. I don't normally have many that require this. It can also be a real eye opener to see how much the case heads are out of square. Danny That's an excellent idea. I just happen to have the Wilson trimmer as well! Thanks. |
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