Tap through resizing die?

[Mr.P]

Making my own press using 3d printed parts.  This prototype is non-functional but I just had to do some physical testing because sometimes I'm not so good at figuring it out on paper.

I'm just doing this for the challenge because what I have already works perfectly well (just pushing through or hitting with a mallet). Found another way where I set my rig on my knee and raise it and bang it on the underside of the table - works like a charm but it's noisy and annoying to anyone else nearby.

I have attached a photo and it seems to be rotated at some weird angle for some reason this site likes to do that.

[Mr.P]

How much can you resize in one go? For example could I force a .257 slug through a .250 bushing?  The Lee bushings resize with less effort than the NOE bushings I got if you wanted to do this by pushing them through by hand.

[K.O.]

well conventional wisdom as I heard and saw with the people I talked to and learned from (since about 1970) was that any sizing over about .003-.004 should be done in steps... But as always your mileage may vary..

[triggertreat]

I would recommend not going over .002" at a time as a general rule, but that said, and having a Lee press with decent leverage, I have sized in larger steps with the thought of the added pressure needed to size in larger steps would spread out my cast bases or the body of the cast more fully, if needed.

The other way I size my cast, depending on what projectiles I am sizing, is to sized them in .001" steps.  My thoughts are that this would give the projectiles multiple passes through the bushing for a better uniformed size.

[rsterne]

How far you can size in one step depends to some extent on the caliber and the press used.... It takes at least double the force to squeeze down a slug 0.002" on a .50 cal slug than on a .25 cal one (you are moving twice the volume of lead).... I haven't found a problem doing 0.003" on a .25/.257 slug in one step, over that I use two steps (or three if going more than 0.006")....

Bob