Removing Lube grooves from a Lee 452-200 6 Cavity mold.

[Diadem]

I am a newbie to casting and this forum. My first casting goal is the reproduce the great ACME 200 SWC NLG HiTech coated bullets I have been using for several years. I am documenting the process I used here in case it may be useful to others wishing to do the same. Keep In mind that I have very limited resources, no mill or lathe (yet), as the saying goes I have more time than money. With proper resources I would have just purchased a custom mold.

[Diadem]

The first step was to purchase and fabricate a cutter. I started with a 29/64 carbide reamer purchased off of eBay for $8.50. This cutter was nearly new with sharp carbides. Testing with pin gauges showed it reamed holes to .454 (or probably closer to .4535). The part that makes this project interesting is that I wanted to preserve the bevel back on the bullets so I wanted the cutter face to be no longer than .230. Using diamond cutters (needed for cutting the carbide sections) in my dremel I removed the morse taper, shorted the reamer and cut the relief. I then carefully stoned approximately .001 off the face of each cutter and tested in an aluminum block until I was sure it was reaming a .452 hole. I then fashioned a collar to make sure the cutter ran perpendicular to the mold.

[Diadem]

Next I purchased a Lee 452-200 mold. I cleaned the mold and removed a few burs. I cast some test bullets to see how the bullets looked before I possibly mucked up this mold. I found that the bullets were out of round up to .458 in one direction. It was perplexing until I held the mold halves together and held it up to the light and realized the mold wasn’t closing all the way. It seems the factory put the alignment pins in too far and they were holding the mold open. I stoned those down until the mold closed all the way and on my next test cast made some normal round bullets from the range scrap lead I have laying around. These weighed 205 grains on average.

[Diadem]

I started my modifications one cavity at a time. I would first dremel out 90+% of the lube groove then with the mold halves in the vice and the reamer inserted into the cavity I turned the reamer by hand with a adjustable wrench and slowly closed the vice until it spun freely. The cavity was in pretty good shape after the cutter was done and I probably could have used it like it was but I wanted a little better finish so I fashioned a polisher with some test bullets and some lapping compound. I turned it each cavity by hand for a few turns to remove any unseen ridges. I cleaned up and degreased the mold real well and reassembled. I cast some more test bullets.



The results were better than I expected and came out of the mold at .453 - .4535, which is fine with me because I planned to resize after high-tech coating anyways. Bullets weighed on average 214 grains with range lead and 207 grains with hardcast which is what I plan to use.

[Bzcraig]

Excellent and off to a great start! Welcome aboard

[Papercidal]

Nice job if Lee would just sell the 6 cavity molds without lube grooves I would have far fewer 100+ $ molds as I much prefer casting with them but can't get the profiles I prefer.

[Traffer]

Very nice work. I work with a dremel and diamond wheels also. But your work makes me look like a cave man. Stoning the flutes of the reamer in my opinion would qualify you for brain surgery. But I am encouraged to see what I could accomplish if I took much greater care. I have a couple of 9mm molds that need the lube grooves removed. I already bought a reamer for them (can't remember off hand if it is exactly the right diameter).
I have had pins in Lee molds keep from closing all the way also. I was able to squeeze them in a bit deeper. Mine seem to loosen up after time anyway, I end up putting a set screw in the side to hold the pins.
Thanks for the post. Keep em coming.

[6bg6ga]

And to think I would have sold the mold and purchased a new one without lube grooves.

[sparky45]

Beautiful job and result. I've been wanting a groove-less mold for some time now, you've given me hope.

[Nines&Twos]

Nice job! Don’t think I could have done it that way.
Makes me appreciate my lathe & a four jaw chuck.
I’ve done a few myself but lathe bored them.

[dverna]

You may consider offering this service to those who are less talented and/or patient. There are a lot of folks using coatings that want bullets with no lube grooves.

Well done BTW

[CraigOK]

You may consider offering this service to those who are less talented and/or patient. There are a lot of folks using coatings that want bullets with no lube grooves.

Well done BTW

I agree, it would be a win win if you have the time

[Diadem]

You may consider offering this service to those who are less talented and/or patient. There are a lot of folks using coatings that want bullets with no lube grooves.

Well done BTW

Appreciate the comments. I wouldn’t consider working on somebody else’s molds unless I had a mill and could do it right. Mucking up my own mold is one thing, but mucking up somebody else’s is too scary.

I have been lurking for many months and already learned more than I can put to use. The talent, experience, and knowledge in this forum is beyond description. I look forward to learning as I venture into casting my own, and then into rifle shooting and casting.

[KVO]

Very cool! I predict you will find much enjoyment in this hobby with your inquisitiveness and attention to detail. Even when one has the cash to plop down for a new tool, sometimes it's more fun to experiment and see what you can do just because. All of these skills are transferable. Even if some say it isn't really necessary for this project, you may find something in the future and have that "Ah Ha!" moment where the knowledge and experience you gained today will lead you to a plan for tomorrow. Nicely done!

[Buckshot]

..........Diadem, That is very impressive work you've accomplished. All of it from front to back you've accomplished quite a feat. Heck, creating your own tooling to accomplish a further modification on another object (mould) to get what you wanted All I can say is that when you DO acquire a lathe and milling machine, and maybe a tool grinder, you'll be a terror!.

..............Buckshot