This works!!

[klcarroll]

Like many here, I have been fighting the battle of “Slug Size vs. Barrel Size”.

In my particular situation, I have a Lyman mould that drops a very nice Foster type slug that measures .690”: ……..And my Saiga 12 gauge has an “Improved Cylinder” barrel that measures .720” through the choke.

…Now I know that the slug’s skirt will upset some due to inertial loading, …….But my experience tells me that .030” is a lot of “rattle room”.

I really didn’t want to endlessly mess with cutting and modifying shot cup fingers, and the idea of using masking tape or paper patching concerned me: …..Mainly because I wondered what would happen to accuracy if the tape or paper only partially separated.

So, …….being something of a “machine head”, I decided to fix the problem by tinkering with the slug itself.

First, …I took some of my standard Foster Style slugs……………….

http://i134.photobucket.com/albums/q84/klcarroll/S7300045.jpg



Then, ……I used a center drill to pop a center on the nose………………….

http://i134.photobucket.com/albums/q84/klcarroll/S7300046.jpg



And then, ……I chucked the slug between centers, and touched it with a standard knurling tool………………

http://i134.photobucket.com/albums/q84/klcarroll/S7300044.jpg



………The result is a slug with a knurled band, the diameter of which can be easily adjusted: ….And repeatability is excellent by simply noting the amount of in-feed required. The slug pictured below measures a perfect .720” on the knurled band. (….And the knurling is a perfect place for a little bit of lube to prevent leading!)

http://i134.photobucket.com/albums/q84/klcarroll/S7300047.jpg


All of these steps take MUCH less time than it takes to tell about it.



Kent

[scrapcan]

Now you just need to make a dedicated hand operated knurling tool. and make me one while you are at it. One that will work for small and large bullets.

[klcarroll]

Now you just need to make a dedicated hand operated knurling tool. and make me one while you are at it. One that will work for small and large bullets.


Actually, ......a small bench mounted tool might not be that hard to do!

It might be possible to modify A Corbin HCT-3 to do this very job, ....if one were to use knurling wheels rather than grooving wheels!

See: http://www.corbins.com/hct-3.htm


Kent

[EMC45]

Flint strikers from disposable lighters. The wheel people! The wheel!

[scrapcan]

:kidding:Kent,

Now you got the picture, but I don't want to spend the change required to get a corbin tool. The corbin knurling tool is the HCT-2

I think if you made 1 good knurled hard rod/sleeve the you could mount with a crank, you could use two smooth rods and make your own knurling tool. I just thought you would make two since you wre geared up:kidding:

[longbow]

SluggerDoug posted a very good article about pretty much what you are doing. He used a helical gear to "rifle" the slug and bring diameter up to bore size. Same idea but a little different method.

If you do a search you should find it. Some good info there.

Longbow

[EMC45]

I think I heard something about flint strikers.