On Tuesday, November 12, 1996 at 2:00:00 AM UTC-6, asm wrote:
# I need load data for a 25 Gibbs.
25 Gibbs case fire forming
Here`s one way to fire form a 25 Gibbs cartridge. Start with 30-06
cases, use a 270 win. Full length Die. Slowly adjust the die down to resize a
false neck to about 250 th. In length .Then use a 25-06 rem. (Again full length
die to help keep the case neck in alignment) Adjust the 25 die down to the
250 th .false neck length. This will create a bulge for the head spacing of the
case. Doing this will help keep the neck in alignment with the body of the case.
Next prime the cases & use a good stout load of fast burning pistol power, around
10 to 13 grains of Alliant 2400 or whatever ya have. Next drop in a small piece
of tissue paper to keep the powder in place, then fill the case about 80 % full
of cream of wheat. Next fill the remainder of the case with more tissue paper &
use something to help push it down, packing it as tight as possible. Sometimes I add
wax to help seal off the case mouth. Then apply a thin coat of oil to the case
neck & shoulder area. If ya used a good stout load of pistol powder & packed everything
good an tight? you`ll blow the case out & have an almost sharp 35 degree shoulder
angle . Then anneal your cases, use your Gibbs die to resize & trim to length.
Lastly use a 25 caliber outside neck turner to insure the wall thickness is correct.
Thick necks can create poor bullet release, causing high pressure spikes & poor
alignment between bullet & rifle bore. Then load a 25 cal. Bullet seated out tight
to the lands, with a moderately light powder load to complete the fire forming of
a Gibbs cartridge. Always start with newer brass & always work your loads up
slowly & safely. Rocky Gibbs once commented a Gibbs rifle with a longer barrel,
makes a Weatherby with a short barrel, just another rifle & By God he was right.