300blk Brass Prep

[kmr007]

I finally got my Zepprecision 300blk jig and its now mounted on my Harbor Freight mini saw. It works great but need some assistance. What's the usual cut length? I read around 1.360-1.370. I plan on cutting 223/556 LC13 brass.

Another question, I will be using Lyman 300aac dies/2 die set. I noticed people removing the decapping pin and reforming the brass. Since I've already cut the brass down, would it be safe to keep the decapping pin installed?

My current setup consists of a Dillon 550b (miss my Lee turret). Thinking of spending extra for a RT1200 to trim the brass. I know there are lower cost alternatives (i.e. Lee hand trimmer, WFT, etc.) but I've been using the Lee Hand Trimmer for all my 223/556 and it's taking WAY too long.

As usual, thanks everyone in advance for the input.

[mif_slim]

I usually cut just a tad over the shoulder. I dont measure. I only do this to be sure that im over. Im lazy....

[CGZ]

Cut them a bit over length to what you'll trim them to (Ie: 1.370 is good if you trim to 1.360). When you resize them to 300 Blackout, they will get stretched again and require final trimming.

You'll need the 1500 trimmer, trim die (it's only carbine BTW no cheaper steel version) and short trim tool head if you want to convert to 300 BLK on the press. All that equipment is a large investment, but it's very helpful for trimming other rifle calibers, you'll just have to get the individual trim dies though. Just remember all that equipment is nearly, if not more than the cost of the 550 press.

I use the RCBS small base dies, I keep the decapping rod in so it resizes the neck correctly.

[2shotjoe]

I do the max over all case length for 300. You'll still have some growth when you resize.

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[skunkbad]

I'm probably doing it the hard way:

1) Cut brass down to 1.370.
2) Rough deburr and chamfer using cordless drill.
3) Hand deburr and chamfer so cases won't scratch resizing die.
4) Resize
5) Trim with WFT to 1.365.
6) Hand deburr and chamfer.

Every case gets a headstamp check and final case length check before priming and loading. Cases need to be 1.358 to 1.368. Checking headstamps is important due to case thickness issues at the neck.

I found this is way too much work. Unless I am bored and have nothing to do, I'm just going to buy cases from now on.

[G38xOC]

What if you resize it first .. cut .. trim .. clean in n out

[G-Man WC]

Tagged

[Yerman]

Tumble cases. Cut off neck, doesn't matter if it's oversized. Chamfer and debur. Lube and resize/deprime. Trim in WFT. Tumble. Make sure there is no media in flash hole. Prime, powder, bullet.

Don't forget your Wilson case gauge

Minus the tumble time, I can do 100 pieces of brass in about 20 mins.

[kmr007]

So do you guys keep the decapping pin intact? This is assuming its cut first.

[Psychbiker]

Best do it in stages to not drive yourself crazy, especially if you're doing a big batch like 500+.

I hate touching the cases multiple times and also hate changing from pistol to rifle on my Lnl press. I'll decap in the lnl with a universal decapper. Then I'll cut 500 or so at shoulder. Then wet stainless tumble. Then put back in lnl hopper and size. Then trim. Then lube, prime, powder and load.

If I had the Dillon 1200 or 1500 that would speed things up dramatically but fitting the 1500 on the Lnl hasn't been figured out yet. I couldn't imagine being able to trim 223 to 556 and size at the same time, what a luxury.

[CGZ]

The Dillon 1200/1500 should work on any press for any caliber other than 300 Blk, which needs the Dillon short tool head. The other rifle calibers that dillon makes trim dies for do not need a thinner tool head like the 300 Blk dose.

[Psychbiker]

Yeah, it will trim 308 and 223 but for the price I want it to also do blackout for me. I'm too far invested in my Hornady Lnl to sell and get a 650. My only option to case prep blackout with a case feeder is to have a custom blackout die made where the chip exhaust is higher and above the Lnl press body OR find an older press and hone down the press body.

I'm surprised no one has figured it out. I'd think Dillon would like to sell more trimmers.

[CGZ]

Well I want them to make a steel die. They only make the carbide for 300 BLk and it's ~$200

[2shotjoe]

So do you guys keep the decapping pin intact? This is assuming its cut first.

nope, don't want to risk break a pin. i have a spare assembly.

[G38xOC]

I dont get it .. at which procedure pin might break ? Is it for progressive loaders ?

If i were to resize first .. shouldnt i be decapping the old primer as well ?