Anybody shooting a 25 Gibbs??

[JJones75]

I have a 25-06 Encore barrel that I'd like to add a little more power to and decrease the case growing so I was thinking about rechambering to 25 Gibbs or just running a 25-06 Ackley reamer in a little deeper to clean up the chamber.

The 25-06 Ackley I have shoots great and I love the way the brass doesn't grow to fast nas well as its performance woith 100+gr bullets , but the chamber is setup with a tiny amount of crush on regular 25-06 ammo to eliminate excessive headspace problems. I have heard that some guys shoot 25-06 ammo with the Gibbs chamber with no troubles but I would likely still form with light loads with bullets seated out deep into the lands

or the other option is going up to 25-300 win or 257 Wby. The barrel is a 1-10 , 28" but I'd like to keep it out of the magnumns if possible

 

[el gordo2]

Re: Anybody shooting a 25 Gibbs??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JJones75</div><div class="ubbcode-body"> I have a 25-06 Encore barrel that I'd like to add a little more power to and decrease the case growing so I was thinking about rechambering to 25 Gibbs or just running a 25-06 Ackley reamer in a little deeper to clean up the chamber.

The 25-06 Ackley I have shoots great and I love the way the brass doesn't grow to fast nas well as its performance woith 100+gr bullets , but the chamber is setup with a tiny amount of crush on regular 25-06 ammo to eliminate excessive headspace problems. <span style="font-weight: bold"> I have heard that some guys shoot 25-06 ammo with the Gibbs chamber with no troubles but I would likely still form with light loads with bullets seated out deep into the lands</span>
or the other option is going up to 25-300 win or 257 Wby. The barrel is a 1-10 , 28" but I'd like to keep it out of the magnumns if possible </div></div>

The answer to firing a 25-06in a 25 Gibbs camber is NO. In the Gibbs cartridges , he moved the shoulder up appx 1/10 inch. A 25=06 wouldnt have anything to headspace on. I shoot a 6.5 Gibbs and have to along will all the other Gibb's chamberings have to form cases first. I use 06 brass and will form a false shoulder that :crush fits" in my rifle. I will then either fireform with a pistol powder and cream of wheat or simply use a bullet and a reduced load. In my experiences , the case will not take it's final shape until fired with a standard load.

Here is and example of the case forming with 6.5 Gibbs, you will see that the shoulder is pushed forward, thus creating more internal powder space.

 

[matthew 101]

Re: Anybody shooting a 25 Gibbs??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JJones75</div><div class="ubbcode-body"> I have a 25-06 Encore barrel that I'd like to add a little more power to and decrease the case growing so I was thinking about rechambering to 25 Gibbs or just running a 25-06 Ackley reamer in a little deeper to clean up the chamber.

The 25-06 Ackley I have shoots great and I love the way the brass doesn't grow to fast nas well as its performance woith 100+gr bullets , but the chamber is setup with a tiny amount of crush on regular 25-06 ammo to eliminate excessive headspace problems. <span style="font-weight: bold"> I have heard that some guys shoot 25-06 ammo with the Gibbs chamber with no troubles but I would likely still form with light loads with bullets seated out deep into the lands</span>
or the other option is going up to 25-300 win or 257 Wby. The barrel is a 1-10 , 28" but I'd like to keep it out of the magnumns if possible </div></div>

The answer to firing a 25-06in a 25 Gibbs camber is NO. In the Gibbs cartridges , he moved the shoulder up appx 1/10 inch. A 25=06 wouldnt have anything to headspace on. I shoot a 6.5 Gibbs and have to along will all the other Gibb's chamberings have to form cases first. I use 06 brass and will form a false shoulder that :crush fits" in my rifle. I will then either fireform with a pistol powder and cream of wheat or simply use a bullet and a reduced load. In my experiences , the case will not take it's final shape until fired with a standard load.

Here is and example of the case forming with 6.5 Gibbs, you will see that the shoulder is pushed forward, thus creating more internal powder space.

 

[matthew 101]

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.