Loading for a 375 winchester

[4t5]

I have some .377 fngc bullets to try in my Winchester, using LEE dies the bullet bulges the case slightly to seating depth,would using a full length sizing die from a 38-55 prevent that?

[earlmck]

No, the 38/55 die will probably squeeze your brass down even farther since it is made for the thinner 38/55 brass. If the little bulge bothers you, you could use 38/55 brass for your cast bullet loads. My Lee 375 sizer (that I am using for loading my 38/55) wouldn't quite size my Starline 38/55 brass down enough for .377 bullets to be held tightly, but my particular 38/55 wants me to use .380 diameter or larger and these make a nice tight fit.

Another thing to try is to only size the brass part way. T'here is a modest amount of taper to these 375 and 38/55 cases so I'll bet you can find a perfect depth to size to that leaves the cases just right for a .377 bullet.

[4t5]

EARLMCK, thanks for the tip, I'll try that!