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Forming 300 blk from 223 cases, lots of pics
dryflash3  [Moderator]


Don't know why powder scoop has a hole in bottom.

I got started on this project last summer and started forming cases before I have an upper. Already have the lower built.

Still saving, had a couple of unexpected bills spring up and set me back.

But got a lot of cases formed anyway. I'm kind of backwards on this caliber, oh well.

First thing I did was put my dies in another box and make the rings into lock rings on my Lee dies. Link to that thread. Then bought a case gauge.

First try,



First thing I tried was necking up 223 cases (once fired RP cases) in the 300 blk sizing die.

They will split without lube. Middle of loading block on left.

Use some Imperial on a Q tip on the inside of the necks and they will expand up. Back of the loading block.



Close up, and I did get a couple of crumpled cases. Bottom right are cases I trimmed with a hack saw freehand. Didn't work out well and was slow.

You really have to press hard on the handle of a Rockchucker during case forming. Beware if using a light weight press.

So now cases have to be trimmed. A lathe trimmer would take forever, So I tried a drill press.



Used the trim head from a RCBS trimmer with a 223 pilot. To protect the thread, wrapped some blue masking tape around threads. Lightly tightened chuck of drill press.

Use 223 cases as is.



Can't hold case by hand, it will spin. Used a couple of layers of blue tape on vice grip jaws. No spin, no marks on cases.

Trim down to the bottom of the shoulder.

Debur case, lube and size in 300 blk die. Remove lube, final trim and final debur.

Case is ready to load. No inside reaming of case is needed.



Another method,

I have seen posts from people that buy a cheap $35-50, don't remember, Harbor Freight cut off saw to trim cases with.

They say to not over heat the motor or it will die. No experience with this method, but an option if you don't have a drill press.



Best method,



Custom made Dillon 1050 set up. Belongs to a friend, I took a couple of pics last time I was over forming cases.

Lubed 223 case in, formed 300 blk case out. Took me about 3 hours total to do 1k. Only brought over 500 cases the first visit.

Station 1 case feed
Station 2 223 sizing die
Station 3 swager, not needed with my RP cases
Station 4 priming, not in use
Station 5 blank, need room for trimmer
Station 6 trimmer with a 308 die cut down. Tool head cut down to get trimmer low enough. This is the custom part.
Station 7 blank, need room for trimmer
Station 8 300 blk size die







Lowered trimmer.



Final product.



What happens if you forget to turn the trimmer on, fail cases.





I'm ready when I get my upper.
gasdoc09  [Team Member]
Very nice, thanks for posting pics.

Originally Posted By dryflash3:
Don't know why powder scoop has a hole in bottom.

My Lee .300 Blackout dies didn't come with a scoop at all. At least you got a conversation piece.
chrismartin  [Member]
Originally Posted By dryflash3:
Don't know why powder scoop has a hole in bottom.


From what I have read, when the 300BLK dies shipped, Lee had not done any load data on the cartridge yet. The hole in the scoop is to make sure you can't use the scoop.
I guess they include it to make you ask or so you don't call asking them where it is or something.
hrt4me  [Team Member]
Thanks for taking the time to post this helpful and informative DIY write-up.

I also don't have a .300 BLK upper yet, but I'm contemplating adding one to the stable...
madmathew  [Team Member]

Originally Posted By hrt4me:
Thanks for taking the time to post this helpful and informative DIY write-up.

I also don't have a .300 BLK upper yet, but I'm contemplating adding one to the stable...

+1 There are so may calibers to choose from, I don't know where to start. We can suppressors in MI now so that makes the Blackout look more interesting now.
DoubleARon  [Team Member]
Great post, OP. While I'm not totally sold on the .300 Blk(I think the .338 Spectre is a better cartridge), I do like threads that show how easy cartridge conversions are.
Jailer  [Member]
Nice post dryflash.

Do you use a 30 caliber 3 way cutter for the final trim? Seems it might speed up the process if you can trim, chamfer and deburr in one step.

I think this is going to end up being my next project.
InfiniteGrim  [Team Member]
Great post been waiting for one.

What do you think about using a dremel to cut them down close then using a trimmer to do the rest?


Now I need a 300 Blackout Upper
okcscott  [Team Member]
what is a good measurement to trim 5.56 brass before sizing with the 300blk die? I have Lyman case trimmer with a drill, it's pretty fast, not as good as a high speed trimmer but fast enough for my needs. I trimmed a few to 1.48, leaves just a tad of the shoulder, case mouth is around .30. I have dies ordered but would like to trim some cases while waiting on the dies. Thanks
BIGGDAWG  [Team Member]
excellent write up dryflash3,

looks a lot like my 7.62x40.
dryflash3  [Moderator]
Originally Posted By chrismartin:
Originally Posted By dryflash3:
Don't know why powder scoop has a hole in bottom.


From what I have read, when the 300BLK dies shipped, Lee had not done any load data on the cartridge yet. The hole in the scoop is to make sure you can't use the scoop.
I guess they include it to make you ask or so you don't call asking them where it is or something.


I just thought it was , thanks for the reason why.
dryflash3  [Moderator]
Originally Posted By Jailer:
Nice post dryflash.

Do you use a 30 caliber 3 way cutter for the final trim? Seems it might speed up the process if you can trim, chamfer and deburr in one step.

I think this is going to end up being my next project.


I have a 3 way in 22 cal. i don't have one in 30 cal.

I plan on getting the set up for my Giraud instead.
dryflash3  [Moderator]
Originally Posted By okcscott:
what is a good measurement to trim 5.56 brass before sizing with the 300blk die? I have Lyman case trimmer with a drill, it's pretty fast, not as good as a high speed trimmer but fast enough for my needs. I trimmed a few to 1.48, leaves just a tad of the shoulder, case mouth is around .30. I have dies ordered but would like to trim some cases while waiting on the dies. Thanks


Trim 223 case to the bottom of the shoulder.

Then case will be long enough to trim to final length after forming in 300 blk sizing die.
dryflash3  [Moderator]
Originally Posted By InfiniteGrim:
Great post been waiting for one.

What do you think about using a dremel to cut them down close then using a trimmer to do the rest?


Now I need a 300 Blackout Upper


Thank hrt4me, he asked me to post my pics in another thread, so I did.

If you have lots of wheels go for it. Rough trim length is the bottom of the shoulder.
okcscott  [Team Member]
Originally Posted By dryflash3:
Originally Posted By okcscott:
what is a good measurement to trim 5.56 brass before sizing with the 300blk die? I have Lyman case trimmer with a drill, it's pretty fast, not as good as a high speed trimmer but fast enough for my needs. I trimmed a few to 1.48, leaves just a tad of the shoulder, case mouth is around .30. I have dies ordered but would like to trim some cases while waiting on the dies. Thanks


Trim 223 case to the bottom of the shoulder.

Then case will be long enough to trim to final length after forming in 300 blk sizing die.


Thanks, I'll adjust my trimmer
Henny  [Team Member]
Dry, if you keep posting threads like this, showing 1050s and the the fun of forming 300 brass, my wife will really hate you. I will blame everything on you and the other ne'er-do-wells on this site that post these things!
dryflash3  [Moderator]
Originally Posted By Henny:
Dry, if you keep posting threads like this, showing 1050s and the the fun of forming 300 brass, my wife will really hate you. I will blame everything on you and the other ne'er-do-wells on this site that post these things!


Just posting what was asked by hrt4me.

Sic your wife on him.

I have also loaded 223 on that 1050, I see why the people who have them like them.

A 1050 is on my lottery list.
hrt4me  [Team Member]

Originally Posted By dryflash3:
Originally Posted By Henny:
Dry, if you keep posting threads like this, showing 1050s and the the fun of forming 300 brass, my wife will really hate you. I will blame everything on you and the other ne'er-do-wells on this site that post these things!

Just posting what was asked by hrt4me.

Sic your wife on him.

I have also loaded 223 on that 1050, I see why the people who have them like them.

A 1050 is on my lottery list.

I currently load on two Dillon 550s and three RCBS Rock Chuckers (two with Piggyback IIs), but two 1050s (one for .223 Rem and one for .40S&W) are on my list now due to threads such as this one, coupled with our plans for increased volume of shooting to support the multigun/3-Gun and local steel plate matches which both my wife and I do together!
dryflash3  [Moderator]
Originally Posted By hrt4me:

Originally Posted By dryflash3:
Originally Posted By Henny:
Dry, if you keep posting threads like this, showing 1050s and the the fun of forming 300 brass, my wife will really hate you. I will blame everything on you and the other ne'er-do-wells on this site that post these things!

Just posting what was asked by hrt4me.

Sic your wife on him.

I have also loaded 223 on that 1050, I see why the people who have them like them.

A 1050 is on my lottery list.

I currently load on two Dillon 550s and three RCBS Rock Chuckers (two with Piggyback IIs), but two 1050s (one for .223 Rem and one for .40S&W) are on my list now due to threads such as this one, coupled with our plans for increased volume of shooting to support the multigun/3-Gun and local steel plate matches which both my wife and I do together!


Sounds like you wife needs a couple of new presses.
Jailer  [Member]
Well I got my 300blk dies yesterday and decided to play with them tonight.

Used the Lyman trimmer with a cordless drill and 22 pilot to trim to the base of the shoulder. Worked great and is pretty fast.

After a quick cleanup of the case mouth I formed them in the dies with my homemade liquid lanolin spray lube. I was expecting some pressure on the handle during reforming but didn't really get any more than normal full length sizing. Then again I did this in my Classic Cast that has a 6 inch longer handle for swaging.

Changed the pilot in the Lyman to a 30 and trimmed to length. I'm a bit surprised how easy it was. First time doing something like this so I guess I didn't know what to expect.

Anyway, my post would be worthless without a pic so here it is. No bling since I just got done with them and they haven't been tumbled.

Thanks for the tutorial dryflash, you make things like this easy for us beginners. Now I just need to get something to shoot them in.

37Bullet  [Member]
Can one of you guy's post a pick of a new press formed case and a pick of a once fired case.

I was reading somewhere else about weird things like keyholing, large fps variations, pressure signs on press formed cases.

Then after being fire formed the weird stuff stopped.
dryflash3  [Moderator]
Originally Posted By Jailer:
Well I got my 300blk dies yesterday and decided to play with them tonight.

Used the Lyman trimmer with a cordless drill and 22 pilot to trim to the base of the shoulder. Worked great and is pretty fast.

After a quick cleanup of the case mouth I formed them in the dies with my homemade liquid lanolin spray lube. I was expecting some pressure on the handle during reforming but didn't really get any more than normal full length sizing. Then again I did this in my Classic Cast that has a 6 inch longer handle for swaging.

Changed the pilot in the Lyman to a 30 and trimmed to length. I'm a bit surprised how easy it was. First time doing something like this so I guess I didn't know what to expect.

Anyway, my post would be worthless without a pic so here it is. No bling since I just got done with them and they haven't been tumbled.

Thanks for the tutorial dryflash, you make things like this easy for us beginners. Now I just need to get something to shoot them in.

http://i19.photobucket.com/albums/b180/Jailer/Gun%20stuff/300Blk.jpg


Nice pic, yes nothing magical about reforming cases. Just something new to learn.

I just take a few pics while I'm doing what I normally do.

AssaultRifler was the one who inspired me with his great tutorials.
imtheflash  [Team Member]
Thanks dryflash. I'm contemplating this round next myself. Just going over in my head how I want to trim the brass down.I'll get the Giraud cutter, but I need to trim the majority off first before using the Giraud. The youtube video I saw of the HF cut off tool leaves a very clean cut. I'm surprised you didn't get more split cases sizing them first. I had a lot of split cases when making 7mmTCU. I'll have to try more lube inside the neck next time I make some.
dryflash3  [Moderator]
Going up from 22 cal to 30 cal is a huge jump, if you do it at once.

Steps would be; 22 to 6mm, 6mm to 7mm, 7mm to 30 cal would be considered a more normal sizing up operation.

I just wanted to see what would happen. So I tried it. Imperial really is good stuff.

I won't be doing that again, you really have to press down hard (two handed) on the Rockchuckers handle to make it work.

Not something I recommend with a lighter weight (aluminum) press.

Much better to trim cases to the bottom of the neck (rough trim), run case through sizing die and final trim.

How you rough trim doesn't matter, drill press, cut off saw, bandsaw. Use the tools you have, or you feel comfortable with.

Like so much in reloading, there are several ways "to get there". Try different techniques, find what works for you.

I never got a 7mm TCU barrel for my Contender. I understand that you may have to anneal the case mouths with that conversion.

I can see more splitting problems with that conversion as the whole case is used.

300 blk, we are cutting off the neck and possible brittle neck problems.

Were you using once fired brass with your 7mm TCU case forming?

Maybe consider annealing before case forming if you aren't.

Good luck

123JohnnyB  [Member]
I'm planning on using a drill press to trim .223 brass down prior to resizing the cases as shown in the pix. Any recommendations on how fast I should set the cutter to spin? Thanks!
okcscott  [Team Member]
I have been using a Lyman trimmer with a drill, I have got the best results with fast. On low or med speed the cutter hangs up and rips the brass.