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Fire forming wild cats

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Unread 07-04-2012, 01:41 PM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 7,191
Re: Fire forming wild cats

Thanks to all that replied to this post and I hope more conversations are still coming.

The reason I added this side note is that normally I make provisions for the neck to
shoulder junction to be in the proper position of the wild cat chamber to head space on
thus normally preventing case stretch.

Fifty posted a great post on his approach to this problem with the K Hornet and I was prepared
to use it if needed.

This is the first Rimed cartrige that I have wildcat-ed and much like the belted cases have the
full case length to contend with. I have made provisions to limit head space on all cases to be
fire formed and just had not had this type of change.

The Hornet is a low pressure cartrige and may be the biggest difference.

It just goes to show "The rule is, There is no rule"

Again thanks to all, and thanks to specweldtom for all the data.

Interesting !

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Unread 07-04-2012, 01:53 PM
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Join Date: Dec 2005
Location: Good Ol' Oklahoma
Posts: 391
Re: Fire forming wild cats

On most improved cases, the shoulder of the case is increased in diameter and I believe this causes material to be pulled from the neck area resulting in a shorter case.

All of my improved cases have exhibited a shortening after fireforming.

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Unread 10-25-2012, 02:50 PM
Zep Zep is offline
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Join Date: Dec 2011
Posts: 395
Re: Fire forming wild cats

J E Custom - I would like to hear your impression on the 22 K Hornet. Is it really worth the effort? I had been reading the basic 22 Hornet does not have to be maxed out powder/speed wise as many varmint loads do for best accuracy (maybe I am totally wrong). That makes me wonder it the K is worth the extra effort.

Of course all comments are appreciated. Thought I would start here instead of posting a new thread.
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Unread 11-11-2012, 01:45 PM
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Join Date: Apr 2003
Location: southwestern N.Y.
Posts: 53
Re: Fire forming wild cats

Originally Posted by J E Custom View Post
Having fire formed many wild cats I just had an interesting outcome and wondered how
many of you have had this happen to them.

Having read about the problems of the 22 hornet while fire forming I was ready to take on all
problems but was not expecting the outcome I had.

Before fire forming, I measured the case length to see how much growth in length I had to
monitor case thinning.

The cases did not lengthen but actually shrank in length by .009 thousandths.

I can theorize why it happened but would like to hear what experiences anyone has had with
this and how/why It happened.

I am very happy with it, but it is the first time for me that a case has shortened while fire forming
in a larger chamber .

Any theories or comments are welcome (You are never to old to learn something).

Having fireformed thousands 0f PPC brass from 220 Russian it all ways shortens if you jam the bullet and lube the case so it doesn't grab the chamber walls.
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Unread 11-11-2012, 06:37 PM
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Join Date: Feb 2008
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Posts: 2,123
Re: Fire forming wild cats

Originally Posted by Mikecr View Post
If you improved shoulders, they pulled the neck back.
I see this all the time.

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Unread 11-13-2012, 05:29 AM
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Join Date: Feb 2005
Location: Texas born and raised
Posts: 752
Re: Fire forming wild cats

In looking back over to the post of Fifty's you referred to, that is the method I use to form the cases for my Contender in 7x30 Waters.

For the most part I simply use range brass as most don't reload the 30-30 and there is usually plenty of it to be found. I have found it almost completely eliminated any split cases that I had seen using other methods. Also as with Firty's results in accuracy I also see the same thing as well. The FF loads shoot just as tight as the final rounds.

That is the only one I load for which has the rimmed case, that gets any real resizing when fired. With my 30-30 AI it's just the same however, if I run the cases through a .303 Brit sizer to expand the neck just a touch to give me the false shoulder, I get great results with them as well.

Like has been mentioned in all of my AI chambered barrels and the Waters, I do see some shortening, but it hasn't effected much if anything IMO, as they all still function and group the loads just fine. Once formed I simply trim the mouths to square, and give them all a consistent lenght, and go on about my business.
Mike / Tx

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"Heck why would I lie, most folks don't believe the truth when I tell them"
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Unread 11-13-2012, 11:53 AM
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Join Date: Oct 2006
Posts: 652
Re: Fire forming wild cats

223 shrinks more, the more pressure in firing.

And when FL resizing, grow more, the more it shrunk.

And when FL resizing, grows more, the more the shoulder gets pushed back.

To get .008" growth per cycle of firing and resizing, the shoulder must be pushed back .005".
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