Berdan-primed cases- can the be converted to boxer primers?

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Berdan-primed cases- can the be converted to boxer primers?

Post by TinkerPearce »

I have a bunch of Berdan-primed 7.35 Carcano cases, and it was suggested that I could bore them out to accept boxer primers. I'm a little dubious, so I thought I would consult the hive-mind.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Marlene »

I dunno, but how hard is it to try?
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by TinkerPearce »

Marlene wrote:I dunno, but how hard is it to try?
For me? Dead easy.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Marlene »

I've seen people just drill through on berdan primed shotshells, to use a standard battery-cup shotshell primer. I don't think that would be a good choice for higher pressures though.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by shinzen »

It is "possible". There are also other workarounds floating around out there. You can also order berdan primers to reload with, but the process is definitely not as easy as it is with boxer. The berdan primer pocket is slightly larger than a boxer primer pocket, so folks have drilled out the existing berdan pocket with the primer in place with the correct size of drill bit- then the flash hole would need to be drilled out.

Another experiment that I have seen tested at one point on youtube is to remove the anvil from the boxer primer and use superglue to hold the boxer primer in place. Seems pretty sketchy though.

I'd probably lean towards just ordering some brass- you can find it on gun broker in smaller quantities, and if you aren't going for hotrod loads or shooting it a ton, it will last you for quite awhile. But it's also fun to see what's possible- but be careful. Not worth wrecking yourself or a rifle over
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Marlene »

FYI, it's the same base diameter as 220 Swift brass, if you turn the rim off the swift cases. Might have to touch up the extractor groove after that, but it shouldn't be a big deal. Length is close to right. Prolly need to expand the necks in two steps. Annealing might be in order for the conversion. It's not beyond your skills, just a bunch of work.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by spara »

Oddly enough, I read about that recently http://www.gunsholstersandgear.com/2013 ... case-ammo/

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Re: Berdan-primed cases- can the be converted to boxer prime

Post by ErikO »

As long as you don't remove too much brass from the walls and open the two holes into one centered hole, yes.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Buck13 »

ErikO wrote:As long as you don't remove too much brass from the walls and open the two holes into one centered hole, yes.
In that case (no pun intended), isn't the main nuisance the decapping step? Usually done hydraulically, IIRC.
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Buck13 »

Marlene wrote:FYI, it's the same base diameter as 220 Swift brass, if you turn the rim off the swift cases. Might have to touch up the extractor groove after that, but it shouldn't be a big deal. Length is close to right. Prolly need to expand the necks in two steps. Annealing might be in order for the conversion. It's not beyond your skills, just a bunch of work.
For a few dozen pieces, this sounds like the way to go. Do this to 40 cases and you have brass for what, 300 shots? 600?
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Re: Berdan-primed cases- can the be converted to boxer prime

Post by Antiquus »

It's brass, so it's pretty malleable. Could probably swedge the primer pocket from the inside of the case with a little thought. Drill it bredan style and voila.
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