fire forming 260 AI brass

r204

r204

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Hi everyone, I will be needing to fire form 260 Remington brass to 260AI. I want to try the pistol powder and cream of wheat process but I am not sure of what powder and how much of it to use to form the brass. Any help would be appreciated.
 
No need for that process when doing AI, if the chamber is done right. Just load up your regular test loads and have at 'er. The case is formed before the bullet is 2" down the barrel and pressures are not affected by the unformed brass.
 
c-fbmi said:
No need for that process when doing AI, if the chamber is done right. Just load up your regular test loads and have at 'er. The case is formed before the bullet is 2" down the barrel and pressures are not affected by the unformed brass.
Click to expand...

I have fire formed 257 AI by that method but I wanted to try the cream of wheat method on the new 260AI barrel in order to save a little barrel life.
 
My recipe is 14gr of Unique and cream of wheat to the shoulder and plugged with either tissue or vegetable shortening. I found anything below that and the shoulder didn't come out sharp. This is in my 260AI.
 
I settled on using the false shoulder method where you decide to fire form with loaded rounds.

I tried just seating bullets out, but still ended up with misfires and stuck bullets. This = no fun.

False shoulder method 100% eliminates this potential. Take your 260 brass, size up using a 270 expander ball, or 7mm expander. Then using a 260 rem FL sizer, size back down until a little bump forms in front of the shoulder neck area. Trial and error method to check for chambering. You want to feel the shoulder upon closing the bolt. Once fired, the round will fire form and you are off to the races.

Don't waste your valuable barrel life during this step. I would still do some load development in this phase. You will find out where nodes exist and then confirm later with fire formed brass.

Good luck wildcatting....you are on a slippery slope to bliss and an empty wallet. Elky......
 
I have a 260AI, and use 10 grains of Bullseye, Fill with COW, and put a piece of wadded tissue in the neck to hold everything in place.
Perfect shoulders, and zero barrel wear.
Regards, Eagleye
 
elkhuntr said:
I settled on using the false shoulder method where you decide to fire form with loaded rounds.

I tried just seating bullets out, but still ended up with misfires and stuck bullets. This = no fun.

False shoulder method 100% eliminates this potential. Take your 260 brass, size up using a 270 expander ball, or 7mm expander. Then using a 260 rem FL sizer, size back down until a little bump forms in front of the shoulder neck area. Trial and error method to check for chambering. You want to feel the shoulder upon closing the bolt. Once fired, the round will fire form and you are off to the races.

Don't waste your valuable barrel life during this step. I would still do some load development in this phase. You will find out where nodes exist and then confirm later with fire formed brass.

Good luck wildcatting....you are on a slippery slope to bliss and an empty wallet. Elky......
Click to expand...

Who did your chamber, elkhunter? A correctly done AI is supposed to headspace on neck/shoulder junction and should never misfire. Old PO was adament about this, in his designing of his AI series of cartridges he designed them to fire factory ammo first time out and was very, very strict about this function.
Gibbs on the other hand moved all the shoulders forward on his design making forming necessary.
 
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