.300 Blackout from .223 casings

[giggitygiggity]

Hi, how/what is the best way to make .300 BLK from .223 casings. I have thousands of .223 casings and I am wanting to get into .300 BLK, but ammo is super expensive and I can't find .300BLK brass at a reasonable price. Thanks.

 

[cfullgraf]

You need to cut off the 223 Remington case at about the shoulder, size in a 300 BLK die and trim to length. Kind of a simplistic description.

There is hobby cut off saw available from at least Harbor Freight (best price) and Micro Mark that do a good job of cutting the case off. Build a stop to make setting up the cases easy and cut away.

There are some U-tube videos showing what some folks have done with the saw.

Let the saw do the cutting, the blade will last longer. Do not do a plunge cut. You should be able to cut off 1200-1300 cases easy with one blade if you do not abuse it.

I squared the mouth off after trimming on the saw. Then I ran the case through the sizer die and then trimmed to final length.

I used a Wilson trimmer last summer but have since purchased a 300 BLK WFT trimmer. The WFT trimmer is slick.

Finally, I used a chamfer/deburr tool to knock off the edges of the case mouth but that may or may not really be necessary.

Finally, i wet tumbled with SS pins. Cases look like brand new.

Hope this helps.

 

[TexasShooter59]

Did you have to turn your necks to get them to chamber well? I've seen the thick necks mess up a shooter in a match. I've heard that this is peculiar to certain brands of brass, but don't know for sure. Personally, I'm still investigating the 300BLK.

 

[Outlaw714]

Cfullgraf hit it on the head. Same system I have used for awhile now. No problems chambering.

 

[cfullgraf]

Did you have to turn your necks to get them to chamber well? I've seen the thick necks mess up a shooter in a match. I've heard that this is peculiar to certain brands of brass, but don't know for sure. Personally, I'm still investigating the 300BLK.

All i have reformed has been LC 5.56 NATO cases. Most of what i have loaded and shot in my rifle have worked just fine but I will agree my data set is small. I have about 1500 cases formed and ready to load.

A few years ago, I did a weight test of LC cases and W-W cases. Close to 500 or each case was weighed. The LC cases were lighter than the W-W cases indicating there is less brass somewhere in the LC case.

So, I cannot vouch for other 5.56 NATO cases.

Supposedly, one of the benefits of 300 BLK is the ease of making cases.

But, i would not rule out the need to thin the walls of the neck of some foreign 5.56 NATO cases. Approach the need carefully.

Besides being an extra step, not that big a deal. I have formed some 221 Remington cases from 222 Remington and 223 Remington cases. Once i figured the best part of the process to ream the necks of the cases, the reforming process was smooth, although with an extra step.

Turning the outside of the necks of the 300 BLK is another option. Again, once you know what to do and set up the neck trimmer, not a big deal.

Hope this helps.

 

[Walkalong]

It's pretty easy. Even I can do it.

 

[TexasShooter59]

I found your thread as I worked on down the page. I have not had a chance to read through it yet, but I did notice the Weener Dog supervising!

 

[Walkalong]

He has a tough job keeping me straight, but he does a good job.