Fat bore and .375" gas checks

[GSSP]

My new Uberti 1894 in 38-55 arrived the other day. Went ahead and ordered some Hornady and Gator Checks in .375" in anticipation on ordering an LBT mold. Slugged the bore it turns out to have .382" across the grooves. Slugged the throat with a pure lead slug and it came out .390". With the bore diameter being larger than the gas checks, am I waisting my time with a GC bullet and should just order a PB bullet mold?

Appreciate your responses.

Alan

[TomAM]

Hornady (and probably Gator) GCs measure .382 OSD with a .389 diameter bell mouth.
Use a sizing die of about .384 diameter and you'll have plenty of full GC contact in the grooves.
If that bullet diameter doesn't make your cartridge too fat to chamber.
You don't need to worry about the GC crimping hard enough to stay on, because the lands will crush it down to at least .374 OSD on the lands when fired.

[GSSP]

Hornady (and probably Gator) GCs measure .382 OSD with a .389 diameter bell mouth.
Use a sizing die of about .384 diameter and you'll have plenty of full GC contact in the grooves.
If that bullet diameter doesn't make your cartridge too fat to chamber.
You don't need to worry about the GC crimping hard enough to stay on, because the lands will crush it down to at least .374 OSD on the lands when fired.

Where are you obtaining a .384" dia sizing die?

[TomAM]

You can either hone an existing die to desired diameter, or get a custom.

[GSSP]

You can either hone an existing die to desired diameter, or get a custom.

Hone how or who's custom? ...Buffalo Arms?

[TomAM]

Haven't bought a custom for a while. You'll have to do a search.
Same thing with enlarging a die. Many threads here on the subject. Your method depends upon your resources.

[15meter]

Hone how or who's custom? ...Buffalo Arms?

Lathesmith is the person on this website to start with for custom sizer dies. I've bought from him in the past.

He does nice work.

[DocSavage]

Return the rifle for repairs if the bore is that oversized.

[Dom]

A problem that can occur by using a .382 bullet , is that the out side of the case can be expanded enough that the round will not chamber. If it does, the chamber is oversize. .382 is oversize in my opinion. The bore should be between .377 & .379. No larger than that. Sounds as if the rifle needs to go back for a replacement Bbl.

[GSSP]

A problem that can occur by using a .382 bullet , is that the out side of the case can be expanded enough that the round will not chamber. If it does, the chamber is oversize. .382 is oversize in my opinion. The bore should be between .377 & .379. No larger than that. Sounds as if the rifle needs to go back for a replacement Bbl.

I thought Starline brass, with their thinner necks solved that problem? Then, of course, the 100 new pc of Winchester brass I bought might have zero value to this project.

Alan