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Old 06-03-2005, 07:33 PM   #1
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Converting Berdan Brass to Boxer Brass!!!

Has anyone one ever done this!!!
1) Drill out the primer.
2) Remove the nipple using a primer pocket uniformer.
3) Drill a hole in the center of the pocket.

Am I crazy for doing this. Will it work!!!! I have not loaded any of the brass and I am fully checking with people that know more than me about it. The only diffence between the boxer new (GRAF) and the GP-11 Berdan brass is the two flash holes for the original berdan primer. I checked the Diameter of the boxer and got the overall area pretty close to the boxer.

7.5 Brass is hard to find or very expensive. I have lots of berdan GP-11 brass that is 1x fired and I am willing to spend the 2 minutes per case to convert it.

Any comments or cautions!!! Your input is greatly apprecaited.

Terry!!!
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Old 06-03-2005, 08:05 PM   #2
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That looks pretty good. I have two concerns:

1. with the extra metal removed from the base of the primer pocket it may be more pressure sensitive. I would suggest keeping pressures down as much as possible until everything checks out.

2. be sure the primer is a good snug fit

otherwise it looks like a good job. You might want to just try a couple before investing a bunch of time though.
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Old 06-03-2005, 11:08 PM   #3
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thanks a LOT!?!?

I thought you were going to send the brass to me!!!

ANYWAYS....

that has been done before, but the instructions I read said they peened the berdan flash holes shut.

because the 7.5 Swiss is a moderate pressure round, I would not be adverse to doing what you are doing, if need be. also, some of that swiss brass is built, technically speaking, like a "brick sh!thouse." I mean that brass was thick. that works in your favor. don't oversize that brass, keep the casehead working to a minimum, and don't hotrod it, and I imagine you will be OK.

but have you looked into .284 Winchester brass?
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Old 06-04-2005, 03:33 AM   #4
 
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Guys used to do this to 9mm brass back before the supply of boxer primed brass was plentiful. They peened the berdan anvil flat to seal the flash holes and then drilled the boxer flash hole.
Removing just the berdan anvil will not alter the strength of the case any, but you shold avoid removing any metal beyond that.

AKMS
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Old 06-04-2005, 05:39 AM   #5
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IIRC Berdan primers are .217 and .250 in size.

Boxer LR are .210 so they will be loose in the pocket.

Why not just buy the correct Berdan primers? PMC imports russian made N/C Berdan primers that work perfect in the 7.5 swiss case.
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Old 06-06-2005, 05:00 PM   #6
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Delloro:

The 284 brass? Can you size it with the 7.5 dies or do you need to buy special dies. I really don't want to do this to the brass I have but Grafs is not helping me with my orders. I love shooting this rifle and The brass supply is thin. I can get the GP-11 berdan loaded ammo for a reasonable price @ the Ammo Store. I have not heard or seen anyone resizing the 284 brass. I get a little shy about resizing brass like that. Especially when I don't know of anyone who has done it. The only good thing about the Berdan brass is I can kneck size it only. Its already fire formed to my chamber. I am not loading these to heavy anyway.

Maybe I should quit caliber jumping and just pick a gun and shoot it!!!

NAAAAAHHHH!!! I like them all.

Terry
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Old 06-07-2005, 08:07 AM   #7
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all you need to do is run the .284 win brass through the 7.5 swiss die and voila! you are ready to load. it is that close. the rim diameter is a bit smaller than the 7.5 swiss, but that does not apparently matter as the 284 brass ejects fine. no special dies, no special nothing, just buy it and off you go. http://www.swissrifles.com has some excellent info on reloading the GP11.
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Old 06-07-2005, 07:24 PM   #8
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Have you loaded any 7.5 using 284 brass?

Terry
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Old 06-08-2005, 08:04 AM   #9
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No, I ordered Graf's just in time. I heard about it at the swissrifles forum.
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Old 06-10-2005, 05:27 AM   #10
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I heard somewhere they could be deprimed with air pressure or hydraulics.If you could get access to i50psi air supply and a chuck that would go into the case and seal the neck to prevent blow back it may work. Let us know if you thy this.Jim
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Old 06-15-2005, 07:05 AM   #11
 
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Why would you want to do this? Why go through the process when regular boxer primer brass is so cheap and readily available? If this is a hobby for you I can understand why you would do it, bit otherwise it doesn't make any sense. Isn't your time worth something?

Also, wouldn't having two small holes and one large one in the primer pocket affect the powder ignition?
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Old 06-15-2005, 08:08 AM   #12
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Quote:
Originally Posted by M14jeff
...when regular boxer primer brass is so cheap and readily available?
but it's not. it *was*, and we hope it will be once again, but today it is not. also b/c the swiss brass is very very high quality.
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Old 06-15-2005, 11:42 AM   #13
 
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Quote:
I thought you were going to send the brass to me!!!
I believe you are thinking of me, delloro.
I'll send you my brass, but I don't shoot too often, so it's going to be a while.

rambo1937, MidwayUSA sells a berdan depriming tool.
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Old 06-15-2005, 08:08 PM   #14
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SKSLOVER:

I am guilty of what he claims. I had order 200 Graf brass and that has been several months ago. There is no supply in sight and I am told some time in July. This was a response to me asking when I was going to recieve my brass that I order in March. (ORDER DATE: Tuesday, March 15, 2005). The brass is all I have to keep reloading for my K-31 until I can get some new boxer brass. I have not done all my brass like this. I am going to test five and see how they work. The primers should fit okay due to the fact that I used the large primer pocket uniformer to get rid of the nipple in the primer pocket.

Terry,
I am showing an est. del. date of 7/30/05.

Thanks,
Shonda Logerman
Customer Service Rep
Graf & Sons Inc.
[email protected]

I hope that they get some in. It will be gone in a week!!!

These guns are great shooters and the brass is harder to find than a virgin in high school.

Terry
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Old 06-20-2005, 04:58 AM   #15
 
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I bought one of the Swiss 7.5 rifles this weekend. I will buy some surplus ammo to start but will get set up to reload also. I will probably buy some brass from Midway. I figure that my time is worth something and if the cost of the brass is going to make or break me I can't afford to do it and probably shouldn't be shooting and reloading. A reloader should get several firings from brass in this type of rifle and to me the cost of this part of the process is not that significant.
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Old 06-20-2005, 07:37 AM   #16
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M14Jeff you will love that rifle. I have had good luck with the Swiss surplus, but I have found the Indian 7.5x55 surplus is a much better deal, and the brass is boxer primed, too.
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Old 06-20-2005, 02:22 PM   #17
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I have talked to several old timers at my club about converting this brass to boxer. Everyone of them said that its not a problem and one of them even says that he has been converting the berdan 7.5 boxer ever since he reloaded for it. The Norma brass is available but rather expensive in comparison to spending a couple minutes to uniform the pocket out and drilling a boxer hole. Like Delloro said about the swiss brass (ITS THE BEST 7.5 brass out there MATCH QUALITY). Why spend the extra money to buy brass I can convert to boxer and not have to hunt for berdan primers.

I have not had a chance to play with the K-31 because I trying to get my new Howa 223 loads worked out. But, soon I will get back to it. Maybe by then I will have my new brass. The Graf brass I got 12 reloads with a annealing job in the middle.

Terry
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