300 Blackout Carbide Trim Help

[herpinator45]

Sooo, I am just trying to figure something out here. I am forming 300 Blackout and am having trouble with case spinning.

Here is my process

Roll Size
Full length resize (223 to Blackout - Dillon Carbide Die)
Trim (Dillon Carbide / RT-1500 - Spins a fair bit)
Ream case mouth

I was not having trouble with spinning when I was not full length resizing prior to trim/form. However I had trouble with wandering headspace. I know it affects my die life, although I am running carbide for both dies, so it should still be in the area of 125,000 as they say the carbide trim dies should be good for almost half a million.

So is this something I have to live with?

I have tried reducing lube, but if I drop it further I am at the point I will risk stuck cases

 

[hexbasher]

what brand is your Dillon Trim die?

 

[herpinator45]

what brand is your Dillon Trim die?

It is the Dillon Precision one. I have had good luck with their products for the most part so I am staying within the brand as much as possible

 

[hexbasher]

im gonna be ordering mine from ch4d ... im also needing a 6.8 die and the dillon 6.8 die uses the RT1500B trimmer and i have only a RT1200.. yet the dillon 300blk die uses the RT1500

i've only used a dillon 223 die and zero issues with spinning...

it sounds like youre FLsizing before the trim die, why? looks like Dillon recommends this. have you tried backing off the FL die so the trim die does the final shoulder bump?

how much are you leaving for trimming after chopping the 223 cases?

(how are you chopping btw? im still needing a better setup verse chopping mine on the work bandsaw)

 

[herpinator45]

If I was running my RT 1200, then it is recommended I pre-trim. However; I am running RT 1500 - hence I am not pre trimming.

I have reconfigured and am trying de-prime, swage, blank, trim and resize, and then full length resize and ream mouth. The only thing it seems that my OAL jumps around a bit more, but no spinning.

The secondary problem with full length resize in this process as the first step is because the case would spin, about 1 in 10 I was getting tearing in the case mouth.

I will play around with it a bit more, however I do think I have it figured out.

I will update shortly

 

[GreenBob]

Are you following this?

___ dillon webpage

In order to trim 300 AAC Blackout, you must be aware of the following:

You MUST be using an XL650 machine

You MUST use the RT1500 trimmer

You MUST use the Dillon Short Trim Die Toolhead #62112

You may use Either the GSI 300 AAC Blackout steel two die set #12237
OR
The Dillon Carbide 300 AAC Blackout Trim Die #62140

Cheers,

 

[herpinator45]

Greenbob

I am not following the Dillon precision guide as I am running a 1050. I have done the same as the commercial producers in the USA.
I have milled one of my spare tool heads to compensate for the short die.

So

XL 650 - No
Dillon Carbide Trim Die - Yes
RT-1500 Trimmer - Yes.

I have in sorts rectified the issue. I have placed sizing die after trim die to ensure shoulder is correctly spec'd

It seems you can either have .0015" +/- run out by sizing first but then you destroy 5% of your cases and really shorten life of die due to spinning

Or

You can have .003" +/- runout by trimming first and then resizing - but no spinning in the trim die, no torn cases, and a much cleaner cut.

The reason there is such a difference in the setup between 300 Blackout and 223 Remington is that you are forming a new case vs just pushing everything back into specification. The resize after resize and trim ensures the shoulder is set back correctly. If I did not FL resize twice it seems that I had about 3% springbuck in the shoulder.

 

[GreenBob]

Necessity is mother of all invention... if possible report back if anything breaks or needs to be replaced before 125k/500k number.

 

[herpinator45]

I will keep you all posted. I am a tinker by nature, so I am sure I will tear it apart and start from scratch on a new project.

I will probably be doing a toolhead in 7.62 x 40mm Wilson Tactical in the next few months as I will probably get bored with my .300 blackout project.

My project before that is probably going to get another 1050 with the Craig Forcht Rotary Drive. I had a Posness Warren on my 1050. It worked well, but it had too much flex in the system for forming 300 blackout.