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Time to make the donuts....

MUY BUENO, DUDE! Them uns gunna HAMMER! It appears that you've put an 0-ring to good use!;)
UNIFORMITY RULES! :D RG

Thanks Randy. You have been most helpful! I have employed the o-ring per your guidance. I had to incorporate an 18 gauge bushing between the punch nut and the ejector frame in order to gain enough clearance to get the o-ring to play nice.

The core seated jacket shown above was done with the new to me Redding press I got a couple days ago. I took some measurements then compared old notes I have on my Rook Chuckers to arrive at a starting point for die depth in the press. I think that made this a bit simpler. Thanks again man.
 
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Been perusing this thread and am now, up to a full YEAR AGO! The issue with this pic/effort, is that the DATUM point is on the tapered jacket [section] ABOVE the core, on the ogive, thus, closer to the center,
therefore very little center-of-gravity offset.

On the J4 prints, the first DATUM point (hoop) above the base is specified: T.I.R. 0.0003" @ 0.150" from the base - it is THIS dimension (wall-thickness variation), along the STRAIGHT section, which will determine CG offset (concentricity). Both the inside and outside hoops may be perfectly ROUND, but offset, or, non-concentric. Bullet dies will not correct a lack of wall-thickness uniformity. Using T.I.R. here is a misuse of the term, which is measurement of roundness, not concentricity.

At the approximate pictured DATUM point (hoop), the same print specifies: T.I.R. 0.0007" at 0.839" from the base!! Again, even presuming a jacket full of core, the CG offset would not be significant, because, relative to the shank, the mass would be closer to the axis.

Regrettably, it appears that George Ulrich has deleted all of his replies. Though repetitive, my experience, parallels George's: the Juenke machine, which is mentioned in several posts, proved incapable of distinguishing between "good" and "bad" jackets.

I had an assortment of bullets made with varying amounts of wall-thickness variation , ranging from 0.0001" to 0.0008" at the base DATUM hoop, which I sent to several Juenke owners/users: not a single one sorted them to anywhere near to correct order . . . and no two "sorters" ahcieved the same sequence.
I do not know what the device measured(es), but it's neither wall-thickness, nor uniformity.

The reality is, as Ferris Pendell advised a pal of mine, who had purchased a set of dies,"The best bullet spinner is a good barrel". Targets don't lie. RG
Randy, you mentioned the wall-variance with J4 jackets.
I have gone to the Hines jackets and have been happy with them, have you ever checked the wall - variance on them ?
 
Randy, you mentioned the wall-variance with J4 jackets.
I have gone to the Hines jackets and have been happy with them, have you ever checked the wall - variance on them ?
Can the Hines offerings still be purchased?!?o_O

Once Bart demonstrated to them the difference between concentric (little to no wall-thickness variation) vs perfectly true, but non-concentric hoops, the Hines offerings were excellent: typically <0.0002". Prior to them becoming educated, I was flattered to have had them contact me for information and perusal of their progress - I never received a sample better than 0.0012" variation in thickness.

They would send samples, then, the rep would contact me, and I'd advise that the jackets measured 0.0012" - 0.0015" wall-thickness variation. :eek: Upon hearing THAT, he'd point out how low tech my comparison (method/device) was/is, insuring that THEY had a contraption which measured(es) T.I.R. precisely to something into the small 1/millionths of an inch - like 0.0000020" (maybe smaller).

Frustrated with my inability to communicate the difference between perfectly round, but excentric hoops vs concentric hoops, I bowed out of the advisory role, and awaited them learning, via other means, what I was, "talkin' 'bout" . . . ;) The guy was stuck on the fact that both hoops were "perfectly round" . . .:eek:

Again, once Bart provided eyes-on-hands-on demonstration, THEY, "got it", and until THEY rolled up the sidewalk, made good stuff. RG
 
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