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Old 05-05-2009, 08:36 PM
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Remington 9-1/2 primer issue

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I am new to reloading and have a question that anyone using the remington 9-1/2 large rifle primers can answer. In the reloading manuals I have read, they stress that a properly seated primer should be inset approx. .003" I am using the RCBS hand primer and I am loading Nosler brass. Using cci large rifle primers they seat with no issue, clearly 3-4 thousandths below flush, however seating the remingtons as far as they can be seated as in metal touching metal in the same brand of brass the remingtons stick out about 3-4 thousandths. I noticed the problem with the first brass I primed. I primed 10 of them just for trial purposes. Short of just loading them and trying them, I am putting the question out to the masses if anyone else has noticed this?
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Old 05-05-2009, 08:59 PM
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I use 9 1/2s and they do stick up a little tiny bit, I can't measure it so I don't know how much. Its never caused an issue even in my floating firing pin Garands which hit the primer and are not exactly gentle when closing.

You can drill the pocket deeper if you really want, I believe it is a letter F drill bit, but I'm not certain. You can also use a bit more pressure on the hand tool, and actually seat them to the depth you want.

I don't really worry too much about it.
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Old 05-05-2009, 09:04 PM
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take your calipers and measure the primers height....if they are the same, you are not getting them seated..... if they aren't the same, the math will tell you how much higher they will be than the others........
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Old 05-05-2009, 09:09 PM
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Primer pocket depth is a bit of a problem at times, especially with Winchester. Primer pocket uniformers are helpful for fixing swallow pockets and Russ Haydon has good ones.

Primer dimension do vary a bit too.

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Old 05-05-2009, 10:37 PM
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well my point is, I am using the same hand priming tool. I am seating them as deep as the hand priming tool will allow unless I shimmed the back side of the priming rod. the cci primers seat correct, and the remingtons seat too high. Unless the thickness of the rim itself is different, then the seating depth should be the same.
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Old 05-05-2009, 11:00 PM
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to heck with it, I will just load up the 10 rounds I primed and see if they work or not. Seams the only truely feasable way to know for sure.
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Old 05-06-2009, 06:04 AM
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Primers will seat below the cartridge base provided the pockets are deep enough but that is not always the case even with brass made by the same manufacturer. If the primer is forced below flush, there is always the risk of cracking the priming cake which may lead to erratic ignition or a possible misfire. I seat to the bottom of the primer pocket and as long as the primer is flush, it is good enough for most of my applications. If you want all of your primers to be uniformly seated below flush, there are primer pocket tools for that.
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Old 05-06-2009, 08:48 AM
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I had some S&B brass that had shallow primer pockets and I used a redding primer pocket tool to get them all uniform. Sort of a hassel, but its better than having a high primer. I'd try that rather than taking a chance on a high primer getting ignited by accident.
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Old 05-06-2009, 11:02 AM
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Some brass has a slight radius at the inside corner of the primer pocket and touching them with a depth uniformer will correct that. Specifications generally call for primers to seat 3 to 5 thousandths below the case head, and the Forster Co-ax press even has a primer seater that forces that condition to be true. I usually run my gas gun primed cases through it for insurance. I think Humpy mentioned looking at some guns that had slam-fired and found hand loads with obviously high primers in the shooter's possession in every case. High primers obviously don't guarantee a slam fire, but they can be the cause of it, so I don't like the added risk. They seem to happen infrequently enough that the odds must be on the order of one in a hundred thousand or so, but why be the guy on the line who had that one?

I've had no trouble with ignition on anything that's been through the Co-ax press seater, but it is true that benchresters feel cracking the primer mix can cause slight ignition variations, so they just seat primers to touch down. They also typically uniform their primer pockets both as to depth and profile.

I've also noticed that one lot of primers will have the anvils flush with the top of the cup while another will have them protruding slightly. It changes the feel of the seating.
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Old 05-06-2009, 12:29 PM
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Being naturally lazy, I haven't mic'd the thickness of Remington, CCI, Federal or Winchester primers for any difference. All mine have seated just fine. The primer pockets ALWAYS get reamed out to remove burnt primer compounds which helps keep the seating depth thing squared away.

Have noticed that Federal primers sometimes have an extra amount of dried compound on the anvil of new primers, though.
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Old 05-06-2009, 02:47 PM
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I suggest that you get a primer pocket uniformer,and do some cases,that had given you that trouble.I suspect that the corner of the primer pocket is raised a little.
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Old 05-12-2009, 07:22 AM
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The last brick of 9 1/2's and 9 1/2M's I bought have all had a cup that was too thick and protruded above the case head. I tried them in several different calibers and cartridges with the same result. Their QC was extinct when these lots were made. They were bad enough I will never use them again unless they are the only show in town.

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Old 05-16-2009, 08:40 AM
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I have used Remington primers for over forty years.

With both the 9-1/2 and the small pistol 1-1/2 I have found a similar problem. I can get them to seat flush or slightly below with a little extra pressure with my bench mounted RCBs priming tool. I haven't had any ignition problems and the Remington primers have given me much more consistent velocities with my cast bullet loads in both rifle and pistol.

I also did some measuring and found the anvils in the Remington primers protude below the primer cup and my CCI and Winchester primers do not.

So, the difference seems to be not in the hieght of the primer cup, but more so due to the legs of the anvil protuding below the primer cup or not.
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