Run the reamer deep and use standard dies. Any problems?

[alinwa]

Since I’ll be grinding the die short to my own spec, would lowering the deck height of a shell holder, to allow more of the case head into the sizer improve the situation?

Well, no. A normal die most likely DOES ALREADY hit the sizable portion of the case. I have stuck a case in a die when I got it far enough in to bind on the actual casehead brass.

 

[ImBIllT]

Well, no. A normal die most likely DOES ALREADY hit the sizable portion of the case. I have stuck a case in a die when I got it far enough in to bind on the actual casehead brass.

Well...I’m still waffling back and forth around what I wanna do. Lol.

 

[alinwa]

BTW..... in my "To Try" list is the following idea TO TRY (I have no idea if it'll work)

And I haven't yet tried it.

But I will;

"chamber a tight chamber to be used with a factory die"

And then "set the compound to like .5 degree or maybe one degree and cut a FLARE at the base of the chamber......... maybe call it "the such-and-such Rocket" design"......

 

[sdean]

BTW..... in my "To Try" list is the following idea TO TRY (I have no idea if it'll work)

And I haven't yet tried it.

But I will;

"chamber a tight chamber to be used with a factory die"

And then "set the compound to like .5 degree or maybe one degree and cut a FLARE at the base of the chamber......... maybe call it "the such-and-such Rocket" design"......

So when you make the chamber larger at the base what keeps the brass from forming to that larger dimension?

 

[alinwa]

So when you make the chamber larger at the base what keeps the brass from forming to that larger dimension?

It's own mass.

Bottom line, you CANNOT "contain" the casehead because it has no springback and it can't be resized. It just does what it does regardless of the chamber around it, which in normal usage is to pop out to ((hopefully) square, squat and swell just a liddle.....

So I make it bigger just to get it out of the way. In normal use a casehead will swell a couple thou before it seasons and stops. This is with 80,000'ish psi loads. Obviously there's a limit, you go too hot and the expansion will continue and the primers will fall out but for general usage at BR pressures the brass will normalize, the primers will stay put for 50-100 more rds if you so choose.

I've never yet tried making just the back bigger.

 

[SteveOak]

......Considering a 6BR run in deep, or a 6RemAI run in short. The AI would involve “ruining” an expensive set of dies but would have a longer neck and possibly longer lasting brass......

My understanding of a 'standard' AI is that the shoulder/neck joint is at the same distance from that base as it is for a non AI version. To have a longer neck you would need to use a separate throating reamer.

This interests me because I am looking at running some extremely heavy, 120 to 125gr bullets in my BR while still using 105 to 108gr bullets for shorter distances. I haven't worked out all the details yet but I"m thinking that a standard 6BR body with a long neck would get me there. I would have room to get an adequate powder charge under a 120 to 125gr bullet and still be able to reach the lands with the 105 to 108gr bullets.

I would have to find some suitable brass, 6XC or something from which to make cases.

 

[ImBIllT]

My understanding of a 'standard' AI is that the shoulder/neck joint is at the same distance from that base as it is for a non AI version. To have a longer neck you would need to use a separate throating reamer.

This interests me because I am looking at running some extremely heavy, 120 to 125gr bullets in my BR while still using 105 to 108gr bullets for shorter distances. I haven't worked out all the details yet but I"m thinking that a standard 6BR body with a long neck would get me there. I would have room to get an adequate powder charge under a 120 to 125gr bullet and still be able to reach the lands with the 105 to 108gr bullets.

I would have to find some suitable brass, 6XC or something from which to make cases.

I wasn’t entirely clear, but I was referring to running a 6Rem AI in short. The “longer neck” in this case simply came from the fact that the 6Rem has the longest neck of any of the parent cartridges I was considering. The only negative to this approach is that it involved shortening the most expensive and difficult to acquire set of dies of any of the other parent cases I was considering. A straight 6Rem run in short would use cheap abundant dies, but would have the most undersized back end of the case. However I could use a Mauser action and build a hunting gun and a match gun on the same cartridge without having to purchase any new actions or bolts and probably without having to modify the Mauser to feed properly like I would with a different cartridge. I’m probably just going to build some straight 6Rems and use a relatively fast burning powder to keep charge weight and velocity down into the 6XC or less range.

If you’re considering running a separate neck and throater, you could just use a straight dasher, then lengthen the neck. This would of course involve trimming A LOT from some other brass, but it would probably allow the use of standard dies and avoid the bolt click problem.