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Fire forming 30 gibbs

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Unread 09-11-2004, 03:06 PM
Junior Member
Join Date: Sep 2004
Location: Jamestown, ND
Posts: 5
Re: Fire forming 30 gibbs

I am sorry. I didn't mean for my response to be so abrupt.I appreciate the help and by no means consider myself an expert. In my defense....the first posting that I read had only a diagram...for some reason your words didn't show up...when I read it again after more research, the rest of your post magicly appeared. You got me.....what caused that to happen. Anyways, I did go back and look at reload beanch and found the information you were talking about and so much more on general reloading...I thank you very much for heading me in the right direction.
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Unread 09-11-2004, 03:25 PM
Posts: n/a
Re: Fire forming 30 gibbs

I was in the process of editing my post and checking the pictures to see if they were going to show up correctly. It is a drawback to this forum format, you can't proof a post before committing to the post.
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Unread 09-12-2004, 12:53 AM
Silver Member
Join Date: Jul 2002
Location: France
Posts: 390
Re: Fire forming 30 gibbs

safe way is to use false shoulder to avoid any headspace problem because headspave is far deeper ( longer ) on Gibbs case

on fresh 30.06 case
neck up to 8 mm or 338 with a expander as lyman M die use for lead bullet
run the in the Gibbs full sizer and resize the neck up to get a two stage neck with a little shoulder , that allow to lock the headspace and you avoid any case breakake

you can to purcahse 30.06 straight case from Z HAT and form step by step with straight case you get formed case at thg eright lenght

good shooting

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Unread 09-12-2004, 04:26 AM
Bronze Member
Join Date: Mar 2003
Posts: 30
Re: Fire forming 30 gibbs

I like using 35 whelen brass to fireform for a 30 gibbs. It will give you a longer neck than when using 30-06 brass. You probably wont have to turn the necks but it gives a little thicker neck if you want to turn them enough to clean them up. I size them down to 338 and then just enough of the neck down to 30 so the bolt closes with a little resistance.
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Unread 09-13-2004, 02:26 PM
Junior Member
Join Date: Sep 2004
Location: Jamestown, ND
Posts: 5
Re: Fire forming 30 gibbs

Thanks a lot. Do you have to trim cases after fireforming with the cream of wheat?
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Unread 09-13-2004, 04:36 PM
Bronze Member
Join Date: Aug 2004
Location: Arizona Mountains
Posts: 50
Re: Fire forming 30 gibbs

I use the same method as Jerry T. except I skip the part about the cream of wheat. I use about 20 grains of Bullseye or Red Dot and a little piece of toilet paper to hold the powder against the primer. No more than a quarter sheet per round. Won't fill out completely but enough that you can use the case for a regular load to sight in and test. I wouldn't trim until after the first full power load.
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Unread 09-13-2004, 11:40 PM
Writers Guild
Join Date: Jul 2001
Posts: 1,459
Re: Fire forming 30 gibbs

Played with the 30 Gibbs for a few years and really like this round. You will need to fireform brass properly to work in that chamber. I use the cream of wheat method.

As was mentioned before, you need to expand the -06 brass to 338 cal. Then run the brass through a '-06 die to reduce the neck back down. You simply keep running the brass into the die deeper until it chambers with firm bolt pressure. I like the bolt to meet resistance about 1/3 before full close. That way I know the brass is solidly against the bolt face and chamber.

I use 15 to 17gr of HP38/Win 231, any LR primer, and fill to base of the neck with cream of wheat. Stuff a piece of paper towel in the neck to keep this mess in place and fire the brass. What pops out is a 90% formed case. The shoulder will be moved but not sharp yet.

Prep this case as normal. I use a 308 Lee Collet neck sizer and spacer to size the neck. Any 30cal neck sizer will work. I don't like FL sizing if I don't have to.

I found H4350 Extreme and 165gr SST to be a wonderful combination. I also used CCI BR2 primers. My loads were getting 3000fps out of a 26" barrel with very good accuracy. You can use starting data for the '06 and just work up till you get the accuracy and vel you want. I was able to go faster but accuracy fell off. Was still a pretty toasty load.

Below are pics of the brass I used. If you have any questions, feel free to ask.


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