Breach seat case length

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Last Post 01 January 2023
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Ross Smith posted this 29 December 2022

How important is case length in breach seating? Should the case completly fill the length of the chamber and neck?

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CBA Member

Premod70 posted this 31 December 2022

Case length is not as important as case seal, jmho. Don’t resize and anneal at the first signs of smudge works for me.

Forrest Gump is my smarter brother.

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barra posted this 29 December 2022

Tin the olde days they would cut a chamber and make a case and use that.

The bullets we’re seated in front of the case and the case was just a vessel to hold the powder and seal on firing.

If your seating the base in or nearly into the lands then it don’t matter.

you could get some funky build up like shooting 22 shorts in a 22lr chamber and have to clean out before full necks could be used again.

If you are seating a bullet and the base ends up in the unsized case neck then you have the debate about that little gap between were the case neck ends and chamber end 45 * angle leade/freebore intersection area and if the bullet rivets under pressure or not before entering the bore.

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Bud Hyett posted this 29 December 2022

Strictly out of superstition, I uniformly trim the case length.

I also anneal the case neck so it opens easier and seals the chamber. I do this based on powder smoke residue along the case neck if I do not do this.

Farm boy from Illinois, living in the magical Pacific Northwest

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Ross Smith posted this 29 December 2022

My bullets will be fully seated into the throat and Ahead of the case mouth.

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barra posted this 01 January 2023

Slightly flare the case mouth to keep seal.

Anneal it soft.

After a few outings your case will look quite worn and perfectly formed.

If you drop it will look it over with fine detail and may even shed a tear, hoping that it will still fit in your chamber.

The primer pocket will eventually loose it’s grip and you may even use a ball bearing on the primer pocket and a rod to smack the primer seat a little tighter for more use.

Well so I have read.

Who would use one of those rare to find 30wcf cases for hundred of rounds anyway.

‘Wish they did that sort of shooting round here. I could learn a lot.

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45 2.1 posted this 01 January 2023

Who would use one of those rare to find 30wcf cases for hundred of rounds anyway.

Harvey Donaldson reported using a 28-30 case (30-30 base case head) 1,800 shots before the case actually had the primer pocket worn where it wouldn't hold the primer. He was one of the Scheutzen era shooters. I have a couple of reformed 45-70 cases used for Scheutzen that have gone 500 shots each and still act like new.