Nope Dave wasn't aware of the 2 different dias of Barnes originals, but these are very specifically marked 38-55 and then in really small print underneath they are marked .375..........I ordered them from WSS (I think) as they were specifically marked 38-55 so I figured they would be .377 after looking at Barnes website. Regardless IF I build another 38-55 it'll definitely be .375 especially in a single shot, so many good .375 bullets to play with both jacketed and cast.
OK Doug, I did some research and I will fill you in on the Barnes original bullet selection.
Barnes makes a 255 grain bullet specifically for the
375 Winchester. It is longer in the nose, and is sized .375" Catalogue number is:
30496
They also make a shorter nosed 255 grain bullet listed for the 38-55, but it is also .375" diameter. Catalogue number
30497. I suspect this is the one you have.
But...they make a second 255 grain bullet for the 38-55, also with the shorter nose, but sized at .377" Catalogue number
30498. I have several boxes of these.
So if you have a 38-55 with the oversize bore, the last one is the one you want. I have a 1979 repro in 38-55, and the bore slugs at .3776", and it shoots the
.377" bullet into very impressive groups at 100 meters. I also shoot a .379" Cast GC bullet that weighs 285 grains. Just a smoking accurate slug at about 1650 fps.
FWIW, I shot my largest Whitetail deer with that rifle.
Regards, Dave.