I have a bit experience with the Lee 105 SWC ,9mm , in a friends Springfield. The Springfield has a rather tight chamber and little if any throat. When sized .357 , you must seat the bullet so the top edge of the bullet driving ban is even (or very close) to the mouth of the case. If any of the .357 sized part of the bullet is sticking out, that part will jam into the rifling ( no throat ) then the slide may not fully close and it's a bear to pull the slide back.
I load this bullet sized .357 in my Walther P-38 with no problems, but sizing the 105 SWC to .356 was a chore. (It doesn't seem like a lot but the .3585 sized to .356 was harder to force through the die than I liked ) . He bought a new 9mm .356 124 grain round nosed mould and I bought a new 120 grain truncated cone 9 mm .356 mould, they are much easier to size to .356 or 357. The .356 sized bullets work just fine in the Springfield. Sized to .357 the 120 gr. truncated cone is the P-38's favorite.
Believe it or not , the 9mm cast bullets (that claim to be .356) get sized , lightly, when run through the .357 sizer die...but it is so very easy to size and lube them, I use a Lyman 450 lube - sizer for this.
No experience at all with N320 or N310. Sorry.
I have been using Red Dot , 700X and Unique because that's what I could find. Got some pet loads worked up with those !
Gary
Last edited by gwpercle; 02-06-2016 at 11:09 AM.
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