Making 350 Legend from 223 brass

[AlfieB]

I have been progressively increasing the neck size using 243, then 277, then 284, then 308 expanders ,then fire forming with a 110 gr. .308 bullet. Is there a better method? I have tons of 223 brass.

 

[garandsrus]

You can use a tapered expander and resize them in one step. I haven’t done it with .223 but do with 30-30 to 38-55. The legend is not based on the .223 case though.

 

[BBarn]

Even though they share the same case rim diameters, the 350 Legend is a rebated rim cartridge and has a body diameter about 0.015" larger just forward of the rim groove.

Although you can make something close to a 350 Legend case from 223, it's not a good idea. Sell the extra 223 brass and invest in some 350 Legend brass instead.

 

[FROGO207]

Even though they share the same case rim diameters, the 350 Legend is a rebated rim cartridge and has a body diameter about 0.015" larger just forward of the rim groove.

Although you can make something close to a 350 Legend case from 223, it's not a good idea. Sell the extra 223 brass and invest in some 350 Legend brass instead.

I second this. Just because you can do something doesn't necessarily make it safe to do. You don't want any sidewall blowouts using brass not designed to be strong near the base if expanded. All but free 223 brass makes it sound like a good idea unfortunately.

 

[adcoch1]

That .015 body diameter difference is what made so many wildcatters mad about 350 legend. Several guys made 357 maxAR out of normal 223 brass, it's an easy conversion, and then the 350 legend comes out conceptually the same except for proprietary brass. It's honestly the reason I'm turned off to the cartridge, but I'll end up with one eventually...

 

[horsemen61]

Even though they share the same case rim diameters, the 350 Legend is a rebated rim cartridge and has a body diameter about 0.015" larger just forward of the rim groove.

Although you can make something close to a 350 Legend case from 223, it's not a good idea. Sell the extra 223 brass and invest in some 350 Legend brass instead.

Best option here

 

[Varminterror]

When brass is readily available and affordable, such as it is for 350L, just sell some of the surplus 223/5.56 brass and use the proceeds towards the proper brass.

Folks have been through the length, neck thickness, and body diameter inconsistencies, and of course, the wasted time in progressively necking up just doesn't make sense.

 

[Dogleg7]

Check RMR. they had a lot of 350 legend brass for sale at a really good price

 

[AlfieB]

Check RMR. they had a lot of 350 legend brass for sale at a really good price

For some reason they will not let me on their site. MiswayUSA does.

 

[FROGO207]

I typed the whole name in on google and got in no problem. They are currently OOS though.

 

[Dogleg7]

Oh well. I am traveling and have not checked their stock in a week or so. Last time I checked they had a lot of 350 L brass. Thanks for the update.

 

[Ohen Cepel]

Worth checking Starline also, I think their shipping is always free which helps with costs.

 

[s4s4u]

I tried making a 357/223 back in the day as a rimless 357 Max. Didn't feed worth a damn. Gave up on it.

The 350L case is fatter, with enough taper to enable reliable feeding.

 

[N555]

I found some brass at the range where it looked like someone had fired a 5.56 in a 350L gun. Seemed to give the brass a good start towards becoming 350L.