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Illinois. Feb 28, 2018. #4. I also use Redding bushing dies. After I anneal the brass, I use a bushing .001 less than a loaded round and after sizing the brass run a K&M expander mandrel through them. For instance for any 6.5 the bullet is .264. The expander mandrel is .263 and allowing for spring back .001 I have .002 neck tension.
2,537. Maryland. Jun 14, 2020. #2. The Bushing will do the work on the outside of the neck. The mandrel works from inside. I use to leave the expander in the die, but my neck tension was never consistent. Using a mandrel gives me consistent neck tension, and helped lower my ES. I use a bushing that is 4 thousands under my desired neck tension ...
Our caliber specific expander mandrels are available in .0005” increments in calibers 22 to 338 and will range from .001” above bullet diameter to at least .003” below bullet diameter depending on caliber. This will allow the reloader to find proper neck tension to fine-tune their loads.
This also reduces the "sticking" when raising the press handle. Either way, you need an expander ball or mandrel or Lyman M-die if you are not neck turning your cases to maintain uniform neck tension. If you have good brass, you can sometimes get away without using the expander ball in non-neck turned cases.
For my 6.5cm I use the lee decapping die then Redding type s die set and remove the expander ball. Then I use a Sinclair expander mandrel after size. The bushing in the die I believe is .002 smaller than the mandrel. Ever since switching to this I find I get a much more even seating pressure from round to round as well.
The .223 mandrel is for sizing the neck for neck turning and the .222 is the standard expander mandrel. Expanding to .002 under bullet diameter is more than enough neck tension for reloading and most expander buttons in the die itself are closer to .001 under bullet diameter. SINCLAIR GENERATION II EXPANDER DIES | Sinclair Intl
I measured concentricity instead of group/Sd. Used 3 different brand bushings/bushing dies, tried the expander ball out of die/carbide mandrel combo using 2 FL dies and then 3 FL dies with the expander in them. The second best result was using the mandrel after Forster FL resize (no expander) and the Forster FL with expander (no mandrel).
Oct 12, 2017. #11. Afkirby said: I would think that the bump die with a lee collet would would work the brass less than a full length sizer and a mandrel. The full length sizer is going to be squeezing the neck undersize for the mandrel to bring back up, while the collet would size it directly without overworking the brass.
"Thanks for reaching out to us! Our Black Nitride mandrels and arbors generally add .0002 to the raw stainless material. The 6.5 Expander is .2632, while the arbor is .2622. The 30 Cal expander is .3072 while the arbor is .3062. Int he past our mandrels/arbors had no issue in the sinclair body, but as of late there have been some fitting issues.
The "fix" is drill a hole or cut a notch in the mandrel where the set screw contacts it. "Our Generation II Expander Dies completely capture the mandrel within the die so the mandrel cannot pull out." Even Sinclair realized it was dumb and redesigned their dies. Unless he’s talking about a collet die with gauge pins.