Questioin on Lee bullet sizer

[Delmonico]

Just thinking here(which may be dangerous) but, if the bullet starts out .001-.002 larger than groove diameter, as long as it's over groove diameter both at the mold parting line and all around, then when it come out the end of the barrel, it's going to be exactly as round as the barrel is, regardless of how round it is when it started.

Don't confuse us with logic.

I'm going to point something out, and then I am done with this tread, the OP is obviously someone new to casting bullets and loading said bullets, and in this case for an 1886 Winchester, not a match type cast bullet rifle,  so as several of us have said, lube em, load them and see if they chamber and if so, shoot them, if they shoot like you want, then that is all that is needed.

WTH do people when working with people new to anything try to make it as complicated as possible when teaching a new person?  I have a theory, but I doubt a lot will like it.   Once you learn the basics of something and can make it work, then worry about advancing to make it better if need be, likely will actually be able to help and teach someone that way,  35 years ago had I had some of the people here trying to help me when I started reloading and casting bullets, I would have likely said the hell with it.

Keep it simple for the newbie and work with them as they want to advance, how damned hard is it to understand that principal?  That is the mark of a good teacher, not somebody try to impress everyone with what they know. 

[w44wcf]

I have a 1886 Winch in 45/70.  I use 300gr, .458 jacketed bullets for hunting.  I am purchasing a RCBS 300gr .458 mold to make bullets for target practice.  The closest bullet sizer I've found is the Lee .457 dia sizer.

If I use the Lee sizer, would there be much difference in elevation for bullet groups between a 300gr .458 bullet and the resized .457 bullet?  

Hopefully that question is clear.

Thanks

Logan,
The pards have given great advice. I have the 300 gr RCBS bullet mold and it is intended for a gas check. If yours is the same and you decide to use a gas check (typically needed if going above 1500 f.p.s ) the gas check will need to be sized after being installed since it is tapered to crimp on (Unless you find some earlier Lyman g.c.'s which were straight sided.).
 
If your load is below 1500 f.p.s. you likely won't need a gas check.

w44wcf

[mehavey]

I use 300gr, .458 jacketed bullets for hunting....
I am purchasing a RCBS 300gr .458 mold to make [CAST] bullets for target practice.
Will there be much difference in elevation for bullet groups between a 300gr .458 [JACKETED] bullet and the resized [CAST] 0.457 bullet?

Folks, If I read this right, the OP is asking the difference in impact between CAST and JACKETED bullets of the same weight -- w/ a thousandth of an inch difference in as-sized diameter.

The answer is that it isn't the sizing die that will make any difference.
Rather it is an apples & oranges difference in JACKETED vs CAST in everything involved -- from  powder type/charges on up.

Cast is a whole new ballgame.

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[Sir Charles deMouton-Black]

In the 1892/1886 platform,I have found the elevation varies with the power of the load. It works bas-akward from what you'd expect. More power gives a lower POI, while toning it down brings it up.

If you load to the same level the POIs might match. You will have to experiment. You can always use a sight adjustment when you have found a load you are comfortable with.

I don't know how jacketted bullets react as I have only loaded cast. Unsized mostly. Sorry I missed really reading the OP as I caame into the thread late.

[Cholla Hill Tirador]

  Logan, forgive me if this question has already been answered, but since you're apparently sizing with a Lee push-thru, you must be hand or tumble lubing? If so, have you considered a lubrisizer so you can size and lube in one step? Nothing is more simple than pushing a raw cast bullet into a die and having it come out lubed and sized. Handle the bullet once, and you're done. With a lubrisizer, if you decide against sizing but still want to lube, just use a die thats roughly the same diameter as your unsized bullet.

    I've tried  tumble lubing and pan lubing. NEVER again. Too slow, too messy.

  CHT