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fire formed brass
woodhog
Member Posts: 13,115 ✭✭
I've read and heard several times ,people speak of fire forming brass, and wonder what they are refering to. Anyone familiar with this term?
I've had a request from my opposite number over in the Reloading Forum to send these types of questions over to the guys who specialize in them.
I've had a request from my opposite number over in the Reloading Forum to send these types of questions over to the guys who specialize in them.
Comments
The majority of reloaders don't bother with standardized chamberings
You could consider only neck sizing to be a "type" of fireforming.
Those who worry about it the most are those of us who are playing with wildcat and obsolete cartridges, where the shoulder shape/size/location is different than the "parent" cartridges. Example: look at a 300 Weatherby cartridge, than look at it's parent case the 300 H&H. Back when Wby brass was rare/non-existant everybody made their cases by fireforming (firing) a 300 H&H cartridge in their 300 Wby chambered rifle
One slight "nit".
You can (and some do) fireform for oversize/over long "stock" chambers, followed by necksizing, simply to increase the case life. The biggest group of people that do it this way are those reloading for belted cases. This allows them to use the shoulder to control headspace.
The 30-40 Krag is kind of a bad example, as it's a rimmed case.
Woodhog
Below is a photo of the shoulder on a 243 Win (on the right) and a 243 Wade
Below are a number of wildcats that have been formed from the 30-30 Winchester
Finely, a 22-250 and a 22-250 AI which clearly show what fireforming can do.
quote:Originally posted by zimmden
Fireforming also adds much to the future accuracy of the case for reloaders. The poorest accuracy usually occurs on the first firing of new brass whether factory loaded or handloaded. Once the case is fireformed in a good chamber, the case will perfectly fit that chamber for many loadings. The headspace will be correct allowing very little expansion and the case neck will be very straight compared to new brass. This allows only neck sizing to be needed for much longer case life and better accuracy since full length sizing is now unnecessary until chambering becomes tight. These techniques work best in bolt action rifles.
[:o)][:o)] JIMBO
On firing, the brass expands till the chamber stops it.
Good explaination , but not to be done !![:0][:D]