Case forming

[444shooter]

I have a big bag of .300 Win Mag brass and was wondering what steps are needed to form into .264 WM. I know they need trimmed, but wonder if I need a case forming die or if I can just use the FL sizer?

 

[joe-nwt]

I have a big bag of .300 Win Mag brass and was wondering what steps are needed to form into .264 WM. I know they need trimmed, but wonder if I need a case forming die or if I can just use the FL sizer?

Why don't you just lube one up and try it?

Doesn't anybody try anything on their own anymore?

 

[Boomer]

Why don't you just lube one up and try it?

Doesn't anybody try anything on their own anymore?

I'll second that Joe.

But for helpful hints, try to neck down the cartridge in as many steps as possible, rather than from .308 right to .264, if you can go .308-7mm-.277-.264 your end result will be better.

You may have to ream and or neck turn the cartridge once you get down to the desired diameter.

Anneal the brass before you start.

Imperial Sizing Wax is your friend, and don't use an expander button until the final pass through the .264 die, at which time some dry neck lube won't hurt. Bushing dies are a better choice and gives you the option of stepping down in smaller increments.

 

[Eagleye]

While forming 300 Win Mag to 264 Win Mag is do-able, it is the complicated way to get 264 brass, and you are likely to see a number of folds in the shoulder area of the formed cases, no matter how you go about it. Problem being, the 300 Win Mag is not only 30 cal, but the case is considerably longer overall and longer to the shoulder than is the 264 case. Much easier route is to form 7mm Rem Mag brass. One pass through the 264 die, load and shoot. But if you have some 300 cases you want to try, fly at 'er. Regards, Eagleye.

 

[Johnn Peterson]

I'll second that Joe.

But for helpful hints, try to neck down the cartridge in as many steps as possible, rather than from .308 right to .264, if you can go .308-7mm-.277-.264 your end result will be better.

You may have to ream and or neck turn the cartridge once you get down to the desired diameter.

Anneal the brass before you start.

Imperial Sizing Wax is your friend, and don't use an expander button until the final pass through the .264 die, at which time some dry neck lube won't hurt. Bushing dies are a better choice and gives you the option of stepping down in smaller increments.

X2 on that. None better.
In addition, for info and equipment on forming 219 Donaldson Wasp from 30-30, RCBS was more than helpful.