V
va78
Guest
I have a hood press that I used for BR years ago. I'm just wondering what reloading equipment the F class guys are using
If you screw the die down another .010, you also set the shoulder of the case back another .010, which increases the head clearance (headspace) another .010.
If you use a taller shellholder (the Redding set, or better, a shim), the amount of shoulder setback (headspace) is not affected by the die & shellholder now making firm contact with each other.
How to determine shim needed:
Size a case. Screw the die in & out to vary headspace. Check the amount you've move the shoulder back (headspace). I guess you can buy a headspace gauge, I always use a "thingy" ("gizmo?") we make by running the chambering reamer into a bit of barrel stub & facing off each end.
Anyway, there should be no more than .001 or .002 head clearence. Once you've unscrewed the die enough to get that, used a feeler gauge between the shellholder and the die. That number is very, very close to the amount of shim you glue to the top of the shellholder.
Cut that value, to the nearest .001, from shim stock, but before gluing, set it on top of the shellholder and (carefully, so as not to disturb the shim) size a well-fired case. Check that the headspace is right. If it is, epoxy -- or in this case, I'd bet superglue would also do the job.
Now, whatever is wrong with the press -- runout, sloppiness, etc., cannot be a factor in any runout from sizing cases. A $99 Lee turret is just as good as a $300 Harrell -- though bigger, and not as pretty. And it's reported the Lee turrets break from time to time.
For the single stage presses, the same applies. Cheap -- Lee, or RCBS Junior, for example, are as good as any other, just not as small for packing in a box for range use. I just find an extra Kitty Litter pail a good bargain for the $100+ difference in price. You can usually pick up used RCBS Juniors for a song, as Benchresters move to a prettier press. The Benchrest shooter Jackie Schmidt takes three RCBS juniors to the range, one for FL sizing, one for seating, and one ... I don't know. I bet he's got $20 in all three.
I haven't checked recently to see if they are still a available, but there used to be a set of shims that would go between the top of the press and the lock ring of the sizing die. This system allows you to easily adjust things as necessary rather than shims that are glued in place.
Rick, these shims (Skip's Die Shims and others) don't address the problem Charles' referring to. What Charles is saying is that to ensure that the sizing is consistent you must adjust such that the press bottoms the die out on the shellholder. In other words, NO GAP. The shimming he's referring to occurs on the shellholder itself such that the die touches down each time.
Redding Competition Shellholder sets were brought out to improve consistency of shoulder bump by providing incrementally taller shell holders as a set. They include a standard holder and additional holders that increase in height in .002 steps. If your die and chamber are such that a standard shell holder does not have a slight interference with the bottom of the die at the top of the ram stroke, when sizing a case, you can try progressively taller shell holders until you get that condition. On the other hand, for my PPCs, I have had to modify shell holders so that they are shorter (take material off of their tops) so that my dies can be set low enough to bump the shoulders of cases that have been work hardened by numerous firings. In situations where a slight reduction of neck tension is not problematic, partial annealing, can greatly improve bump consistency. Gluing shims to the top of shell holders addresses the same issue as the Redding Competition shell holders. The shims that go under lock rings are for an entirely different purpose. In the next few months there will be a new development that will eliminate the need for special shell holders or glued shims. Stay tuned ;-)
Are people commonly experiencing dies that don't reach the shell holder when the headspace is properly set?
Regards,
Rick
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