progressive reloading

[EMT John]

I had a post on here a while ago about trimming, im still not understanding something about the trimming in progressive reloading. my understanding is you need to trim after resizing but i dont see people doing it on a progressive reload. i posted a couple of youtube links of vidoes.

http://www.youtube.com/watch?v=bzrvZ0MLkwI

http://www.youtube.com/watch?v=F4yBha0LPws

[mstlaurent]

Size and trim before you reload on the progressive. I have a Hornady LNL AP, so I set it up with a lube die and a sizing die, this decaps the primer and resizes the brass. Then I trim it with a Possum Hollow chucked up in a drill press and run it through the tumbler to remove the lube. After that is done I set up the press to load with a plain decapping die in the first station to make sure there isn't any tumbling media stuck in the flash hole.

[Bug Splat]

Yeah its kind of a speed bump with rifle rounds. Normally you check the length of the brass after you resize it. You don't always have to trim though, only if it needs it. If you trim you can maybe go a few reload without trimming and still be ok. This is one of the reason some people don't use a progressive for match ammo. You can't put in all the love you normally would with a single stage. I know a lot of guys who will run their rifle brass through the progressive and only resize it. They will then go through and check each case for length and then go back to the press and run the batch without the sizing die. Reloading rifle rounds "correctly" will never be as fast as pistol rounds. Its just the way it is.

RCBS claims to have a resizing die that stops growth but I don't see how that can be 100% ture. It may stop the length of the case but brass flows and thins out. If you keep mashing the brass back down it has to build somewhere and my bet is you will get donuts at the inside base of the neck and top of the shoulder and that will cause problems with accuracy.

[huckberry668]

Progressive trimming is done with a specialized sizing die that allows a motorized trimmer to be attached for trimming. You'll need the sizing/trimming die, motorized trimmer assembly and a vaccum. The vaccum attaches to the trimmer to suck the chips out.

http://www.dillonprecision.com/#/content/p/9/catid/8/pid/23636/Dillon_s_Rapid_Trim_1200B_Case_Trimmer

http://www.dillonprecision.com/#/content/p/9/catid/8/pid/25244/Rapid_Trim_1200_B_Size_Trim_Die

As you push the ram upwards and feeds brass thru the die, the cutter on top of the die trims the case mouth and vaccum sucks the chips out. You lower the ram to prime and turn the turret to the next station and insert a new brass onto the first station.

You can't use a regular sizing die if you're to use the trimmer. You have to buy the caliber size/trim die you need.

I'm wondering if the system deburrs the case mouth and if it doesn't what good is it done progressively? Maybe best if they combine RCBS' 3-way trimmer setup.

[C.G.]

You can't use a regular sizing die if you're to use the trimmer. You have to buy the caliber size/trim die you need.

I'm wondering if the system deburrs the case mouth and if it doesn't what good is it done progressively? Maybe best if they combine RCBS' 3-way trimmer setup.

Since the case is encased in the die and the motor runs at high rpms and cuts cleanly, there is no need for deburring.

[huckberry668]

there is always a need for deburring after trimming. At least the inside of the case mouth. If you don't the squared edge will shave the bullet when you seat it.

[joelogic]

there is always a need for deburring after trimming. At least the inside of the case mouth. If you don't the squared edge will shave the bullet when you seat it.

The dillon trimmer puts a real nice edge on the brass and does not shave any of my bullets.

[huckberry668]

sounds like Dillon thought of everything maybe I should try it on my 550.