This is the final 30-30 BR Print

M

mturner

Member
Some time ago several people had asked me to send them my reamer print. I didn't really have one since I just grind my own reamers. I drew up a print and emailed it to those who were interested. The main problem with print I emailed to a few was the neck length. I failed to change the dimension from the stock chamber neck length. In reallity, in order to be able to trim the necks so that .005"-.010" can be maintained, the neck on the reamer has to be shortened a considerable amount. Also I run a 1.75 deg. zero freebore throat. You can have Dave grind any throat angle or length you want. These reamer dimensions are guaranteed to give you a 30-30 BR chamber that is second to none.

Additional notes: I do not use a reamer with a rim. I just cut the chamber to depth so that the rim headspaces against the back of the barrel. I also face the rim thickness to .0555" to .0558", and set the bolt face at .056" from the back of the barrel. It is not necessary to face the rims, but there's a lot to be said for .0002" to .0005" headspace that never changes. I use a carbide ring die to size only the web of the case. I use a Lee collet die for sizing the neck. The rest of the case goes unsized. Don't bump the shoulder, just let it stay at zero headspace. If it starts to get a little tight after around 15 firings, just anneal it.

I just added a pdf file since the photo is downsized when uploaded.

Michael
 
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Thank you Michael!

At one time, you had shown some photos of how you cut the extractor opening in the barrel for the .30-30, or, I suppose, any rimmed case. Could you repost that too, or post the link?

And one other time, you'd mentioned that you made up tooling to swage flashholes. That too would be extremely interesting, with applications beyond the .30-30.

A lot to ask, but when you've got a willing horse . . .

Charles
 
Michael,

Thanks for the link. My interest in the flash hole swaging tool stems from my long-range shooting. I believe, rightly or wrongly, that evenness in ignition is more critical at 1,000 yards than with point-blank benchrest.

Sadly, the chamberings I use are older, before the new stuff came along. My .338 is on the 404 Jeffry case and my .30 is on the 8x68 case. All RWS brass, though I guess that will have to change, or I'll have to pay a high premium. Even my "medium" 6mm is on the 6.5x54 M-S case (a 2-inch PPC), done long before the 6.5x44 Lapua case was dreamed up.

All this means that my caseheads are different from yours. I imagine we could make the tooling if we knew what to make -- sounds like the flash hole mandrel is on a piece that fits in the primer pocket, and the swaging is done with a piece that fits over the outside of the case?

As always, thanks for you help.

I'm going to keep a copy of the .30-30 reamer print, as will, I'd bet, a lot of guys.

Charles
 
I found one wrong dimension on this print. I had asked Dave to shorten the neck by .010". He did shorten the OAL by .010", but not the dimension from the shoulder to the end of the neck. The print # is correct, but I will repost the .pdf after Dave and I get together one more time to determine once and for all what has happened. I think the OAL will go back to 2.02" but the .587" will stay the same. At that time, anyone who has downloaded the print will have a chance to resave the print in its final form. I guess that final is not always final. But it will be final after this one error is corrected. It would have only affected the trim to length dimension by .010", but I want this thing to be perfect.

Michael
 
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