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Posted: 1/13/2023 9:13:31 PM EDT
Do the Magma Engineering lead bullet lube/sizer dies fit RCBS Lube-A-Matic press?  Are most/all lead bullet sizer/lube dies "industry standard"?  I understand that RCBS and Lyman lead bullet sizer/lube dies are 100% interchangeable, same external dimensions.
Link Posted: 1/13/2023 9:24:30 PM EDT
[Last Edit: Tom-from-Michigan] [#1]
I have a bullet sizer from Magma Engineering that I bought in the '90's. It's virtually the same as the Star sizer. It pushes the bullets through the die. There are several holes drilled through the dies. The instructions shows how to plug the unused holes with lead shot. The tool works great. Mine is mounted on a heater. It's quite fast. But, to answer your question, the dies are similar in appearance, but a different design.
Link Posted: 1/13/2023 9:31:40 PM EDT
What lube/sizer press do you use for lead bullets?  My lube/sizer die is a "505 Star Sizer" die.  I bought it from Magma Engineering. I wonder if it'll fit in RCBS press.  Everyone is closed until Tuesday. -- CS
Link Posted: 1/14/2023 7:59:38 AM EDT
I thought they were all the same.   Thankfully.  I have a Lyman.
Link Posted: 1/14/2023 3:06:08 PM EDT
I also have a Lyman bullet sizer. It uses dies that have a rod in the center to push the bullets up and out of the die on the up stroke. I believe the dies for the Lyman and the RCBS sizers are interchangeable. I think the top punches are interchangeable too.
Link Posted: 1/14/2023 3:31:55 PM EDT
I have both the Lyman and the Star. They use different dies. The Star is fast. I leave that set up for .45 ACP.  I use the Lyman for everything else. The dies are easy to change in the Lyman. Powder coating seems to be a trend now. I have not tried that yet, but it looks easier to do. Magma had special bullet moulds to cast bullets without grease grooves. Those are for powder coated bullets.
Link Posted: 1/14/2023 3:35:09 PM EDT
[Last Edit: SteelonSteel] [#6]
Star shank diameter is 0.75” and has a flange on top.

Lyman/RCBS lacks that shank flange and has a 0.7 diameter.

I don’t think you can run a star in a Lyman or RCBS.

You might get away with a Lyman/ RCBS die in a Star if you rig a collar in the o ring groove on the size die.   Otherwise you would push the die out with the bullet if memory serves me right.   Never tried it myself and this is speculation.
Link Posted: 1/14/2023 4:47:08 PM EDT
Any idea why anyone would every want or need to plug some of the holes in the lube die with lead shot?  Is that a technique to manage "over" lubing the bullet grooves?
Link Posted: 1/14/2023 11:12:41 PM EDT
The lead shot is to plug the holes that are not in line with the grease grooves on the bullets. Otherwise, grease(really kind of a wax) would be pushed between the bullets and in crimping grooves. On the Star, a bullet remains in the die. A bullet is feed in from the top and the one that was in the die is pushed out. When the handle is pushed up at the top of the stroke, grease is force into the die and the grooves of the new bullet. Then the process repeats.
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