Slugging a Winchester M94 with push through slugs??

[Wiking]

I received the push through slugs and read the sheet of paper that came along. However I don't quite understand the procedure 

I get the part with filling a case with lead and chambering it before slugging. I just don't understand why?? After inserting the lead-filled case and closing the action I start slugging. When the slug hits the lead-filled case... then what? Should I then eject the case and push the slug all the way through?? Why not just push the slugs from muzzle to breech with an open action?

I assume it has something to do with you needing to know how long the bullet has to be, or how long my chamber is. But again, I just can't seem to be able to wrap my head around this.

I plan on doing it this weekend so i can get you the slugs as soon as possible 

[R J Talley]

I'm not Veral and I'm not answering for him. I'm telling you what he told me a few years ago as best as I can recall. But please, wait for him as I'm not too sure it I recall it all correctly. First, he had me fill the case with a steel rod flush with the mouth of the case. Then he had me lightly oil the bore and he really emphasized lightly. I chambered the case and started the slug at the muzzle. He told me to use a medium weight hammer (2 lbs), a mild steel rod that closely fit the bore  and drive the slug with one or two heavy blows. When the slug reached the case, I was to give it one good whack. Then I was to see if the case ejected easily or hung up slightly. If it hung slightly all was good. If it came out easily, I was to whack it one more time. This upset the slug to fill the chamber and the leade as well as the rifling. When the case was ejected (I had to work the lever and give the slug a slight tap at the same time) I wound up with a perfect model of my chamber, throat and rifling. I sent this to Veral and had him cut me a mould.

[Veral]

  Thank you R J.  Exactly what I told you, but probably in better words!

[Wiking]

Thank you that sure made it understandable.

I do fear that I might screw it up, so I was thinking of doing it 2 or 3 times, or would that be too confusing for you if you recieve that many slugs??

[Veral]

  It wouldn't be confusing for me at all, as I'd just pick the best looking slug of the lot and take measurements from it.  The only variations will be in how well you get them swaged in.  If they don't show a sharp read of the rifling, with throat and rifling origin clearly defined the slug isn't well done, but I get many which fit that catagory and are still good enough to fit bullets to.
  Just take a deep breath and JUMP IN!  It isn't all that difficult once you get started.
 
  You are reminding me of myself when I'm planning a new large project, normally building something.  I can't sleep nights for planning the best angles to all the details.  Then when I get into it I wonder why I fretted and planned so much.  I rarely follow the plans that occupied my dreams anyhow!