300 Blk initial sizing from 5.56 Brass

[arrowshooter]

I'm setting up to make 300 Blk from 5.56 LC brass and I am wondering if I should use a second sizing die for the initial sizing from the 5.56? I'm thinking that I would be saving some wear and tear on the dies used just for re-sizing from already fired 300 blk brass.

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[v0lcom13sn0w]

ive made 1000s of 300blk brass. i take some 0000 steel wool to the inside of my sizing die when my dies start to scratch the brass. cleans it right up.

 

[v0lcom13sn0w]

your dies are WAY harder metal than the brass youre running thru it.

 

[umrek]

your dies are WAY harder metal than the brass youre running thru it.

This.

You are not going to hurt your dies. Use *just* enough lube so that the brass doesn't get stuck and you are good to go!

 

[Member 5605]

Trim, lube, size, size again, clean, trim to proper length, load, shoot, clean repeat.

Mentioned above, your dies are way harder. I've done stuff I should with dies to see just how far you can cram a large caliber into a small die because I could.

 

[arrowshooter]

Roger that you guys. I'll be off and running once my ZEP jig gets here.

 

[Deavis]

When I cut 300 BO and sized I decided to do it one time and did a 5 gallon bucket of 556 brass, figuring that would be enough. Now my bucket is getting skinny !

I'm a big fan of the lanolin and IPA for lube.

 

[HighlandLofts]

I 2nd the home made lube10 to 1 red bottle of HEET dry gas and liquid lanolin.
I use to use Hornady One Shot sprsy for resizeing and would get stuck cases, mostly 223 cases.
Since swithing over to the home made stuff no more stuck cases.
I need to pick up the mini cut off saw from harbor freight and s 300 blackout jig from Squirrel Daddy.

 

[SHPD_Retired]

After cutting the cases I chamfer and debur them before running them through the sizing die. That is all I do that I would consider extra.

 

[HighlandLofts]

What cut off wheel do you use in the cutt off saw?

 

[Caveman Jim]

After cutting the cases I chamfer and debur them before running them through the sizing die. That is all I do that I would consider extra.

I also do this after seeing what I cleaned out my first 300BLK die set (used), I pulled out a gob of fine brass shavings from the top of the sizing die.

+3 for the Lanolin/Heet concoction, I'll never use anything else unless I run out and have a tub of Crisco...

I have my jig set up to cut cases at 1.360 +/-, chamfer in/out then resize. There is minimal
trimming to do afterwards and most times the inside chamfer is still present so only a light chamfer is needed.

 

[umrek]

I also do this after seeing what I cleaned out my first 300BLK die set (used), I pulled out a gob of fine brass shavings from the top of the sizing die.

Like this monster I found after a crimped military primer pulled my decapper/expander out and I couldn't get it to go back in?

 

[Caveman Jim]

Like this monster I found after a crimped military primer pulled my decapper/expander out and I couldn't get it to go back in?

View attachment 711411

Yeah, just like that, it was a mess to say the least...

 

[Caveman Jim]

What cut off wheel do you use in the cutt off saw?
[/QUOTE

They have a metal three pack of these blades for replacement from Harbor freight.