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+--- Thread: "Houston, we have a problem" (/showthread.php?tid=165)
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"Houston, we have a problem" - pinzgauer - 03-24-2011
I've seen something like this happen with 7/08 RP brass with a collet die when I had it set too low. In my case the bulge was outwards where the shoulder met the main case wall. I had to full length resize the once fired to get it right. And in some cases, pull the bullets and resize as they would not chamber.
By the way, I'd have expected the expander ball to correct your problem on the upstroke. It also appears that the overall case length is shorter by the buckle amount... is that just the photo or is there a difference?
Lastly, do you really want to lap the neck section of the die??? Unless you are concerned it's overworking the brass I'd focus on the expander ball. Even at it's current smaller dimension the ball should expand it to it's size (expander ball OD + wall thickness minus spring back). The Hornady dies have a setup point for where they want the ball to be. If you do not do that you can run into problems. From memory it's where the air vent bleed hole is.
"Houston, we have a problem" - Hoot - 03-24-2011
My new box of brass comes in like the last box (different lot#) with .257 ID / .289 OD necks. There is no point in having a sizing die that sizes the OD even further down (.285) as was the case with mine. That's why I've been painfully, slowly lapping it a little more open. After two nights effort, mine is now up to where it resizes (.299) fired case necks down to .288. The .2628 expander then opens them enough to slip through and they snap back to .2615. The same as when my necks were sized down to .285. One more evening's effort should get the die to where it resizes the .299 necks down to .289, just like virgin brass. I'm really trying to reduce work hardening with that effort as it seems to have no effect upon the final ID once the expander drags back out, but I believe it will improve the life expectancy of the brass. At that point, I will stop, do an initial loading, shoot it and process the spent brass to see if they still prefer to collapse, rather than seat the bullets. If I still get collapsing, I will try to get another expander plug from Hornady. If I get time today, I will call Hornady and see if I can find out what the spec is supposed to be on that tapered decapping/expanding plug. The die parallels my chamber dimensions fairly well excluding the neck OD. Here's a graphical representation of the dimensions. The trained eye will see that the particular piece of unsized brass I chose to measure was from a particularly hot load (30gr 8208/Nosler 100gr BT/2821fps). My first loadings had more neck tension than was probably good for them.
![[Image: ojik5t.jpg]](http://i51.tinypic.com/ojik5t.jpg)
Hoot
Edit: I forgot to answer your question. The ball was set to where the stem managed to push out the primer and fully pass through the neck into the case body before the neck is sized further up. I did not note where that fell WRT the bleed hole.