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Deprime while resizing ?

I tumble, decap, bush necks, and clean pockets before sizing. I try to keep the sizing die as clean as possible. It gets swabbed with q-tips and alcohol when I’m done. Feeds my ocd.
 
Question: what is the theory for decapping and sizing in separate steps? What do you think that you get out of it? Even reloading benchrest with Wilson hand dies, it had never occurred to me to do that.
 
Cleans the case before sizing and cleans out the primer pocket to a degree. Apparently, the wet tumble with stainless media does a better job in the primer pocket. I've not tried it, but will in the future.

Question: what is the theory for decapping and sizing in separate steps? What do you think that you get out of it? Even reloading benchrest with Wilson hand dies, it had never occurred to me to do that.
 
I've reloaded for years. My brother just started. He asked me the same thing. Deprime first, then clean and size? Or just clean, then deprime while sizing?

I had to be honest. I deprime first, then clean and size. Not because I can show it is better, but because I'm too OCD to load for precision with dirty primer pockets. That crud might build up and leave a proud primer or some debris could plug the flash hole and I'd never know.

I told him some reloaders have never seen their primer pockets since the brass was new. If it was originally factory ammo, they've never seen them. Ever. And one would likely not be able to measure on a target whether there is a difference. I would have to be a much better shooter and reloader before I could measure that.
 
Question: what is the theory for decapping and sizing in separate steps? What do you think that you get out of it? Even reloading benchrest with Wilson hand dies, it had never occurred to me to do that.

Still trying to figure this out myself. I see that a lot of reloaders do it, but I'm still not sure why. I do it only if I am processing a large amount of super dirty NATO brass with crimped pockets. Deprime, tumble, FL resize, tumble again, trim, then run them through the RCBS processing station.

Usually though I just put the brass in the tumbler, then resize/deprime, tumble, and then the rest.

I do 2 rounds in the tumbler because I like shiny brass. Overkill maybe, but I can run the tumbler whenever, and it doesn't cost me anything to do an initial clean.
 
Deprime
Tumble in walnut with nufinish and dryer sheet
FLS with expander removed
Neck size with a Lee Collet die (I did remove the decapping pin from this die)
Prime
Throw powder with drop and trickle on a beam scale
Seat bullet

Not the fastest but it works.
I use walnut and some Brasso. Is the Nu-finish less harsh?

Also, what does the dryer sheet do? Do you cut it up at all, or just toss one in?
 
My process.. for ammo that matters👍🏼
Anneal.
Clean with a blend of Brasso and Course Fiber.
Tumble clean.
Chamfer - de-burr necks.
Lube cases.
De-prime and FL size and bump shoulders .002” w/ bushing neck die.
Clean again as above.
Tumble clean.
Run brass thru 21st Century mandrel.
Quick look at flashhole.
Hand prime.
AT V3 - to charge weight
Arbor press with force pack - seat boolitt’s to desired jump.
Mark brass for number of firings.

Shoot and repeat, same routine every time.