280 AI : Any Down Side To Fire Forming With All Copper Bullets?

[PA Plumber]

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[PA Plumber]

Why not use the COW method and no bullets?

Appreciate the post.
These first cases were part of barrel break-in and scope sight in. (although the scope only took one shot)
I didn't mind one bit using fuel and copper to do this the first time.
Any more cases and I'll likely use the COW method. I have oodles of pistol powders and 100 Large pistol Magnum primers and no large pistol. A buddy gave me the pistol primers years ago and I forgot I had them. Good way to burn them up.

 

[WildRose]

Why not use the COW method and no bullets?

With no bullets how do you seal the case to build enough pressure to expand it?

 

[Azrael]

In a case that size, about nine grains of Unique, case filled to the neck with COW and plug the neck by jamming it into a bar of soap. other pistol powders work; you just have to play with it a bit.

 

[Alsealongrange]

There are many recipes for fire forming the brass. You should be fine with or without bullets. nosler made this cartridge SAMMI spec give then a call and ask their balistics tech.
Or any low book charge will be a safe load to use.