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pahermit
03-18-2016, 01:22 PM
What is the best diameter lead bullet,. 376. . 377. . 378. Or 379.What do you owners find is most accurate?
jimofaz
03-18-2016, 01:58 PM
My Ruger #3 .375 Win. likes .377"
triggerhappy243
03-19-2016, 04:07 AM
I have a 2 cavity mold for the 375. it is a lyman 379248, casts a 250 gr. boolit. would sell it,
crash87
03-19-2016, 09:24 AM
My 375 takes a .379 bullet dia. But that was after I slugged the bore to see what it actually was and then did a throat slug to see what I had there.
By making a throat slug I also found I can use 38-55 brass also.
Crash87
Good Cheer
03-20-2016, 08:50 AM
Mine used 375296 at .377" diameter.
With the Weaver T-10 it made little groups.
Green Frog
03-26-2016, 09:37 AM
Essentially it's a modern update of the classic 38-55, so it should be accurate to a fault. Since Ruger uses modern methods, I would expect their barrels to have consistent bore and groove diameters. If .377 works for Good Cheer and pahermit, I'd wager a spent primer or two that size would be a good starting place for you as well. JMHO, YMMV!

Froggie
Doc Highwall
03-26-2016, 10:19 AM
The 375 Winchester was designed for a .376" diameter bullet.
pahermit
03-29-2016, 09:22 AM
i'm shooting both .376 and .377 right now.Trying to find out which shoots better.Have a245gr and 260gr lead bullet.
Doc Highwall
03-29-2016, 11:37 AM
It is always better to error on the large size with cast bullets.
pahermit
03-29-2016, 05:20 PM
I spoke too soon. My #3 was shooting fine with both diameter bullets. Then it started to shoot all over the target, even had some hit the target sideways. The load was 11 gr unique with both bullets. Checked and cleaned the bore, no leading. Mmy marlin jes rebore shoots a 376 at 50 yds almost all touching. What is the twist on the ruger 375?
Artful
03-30-2016, 02:05 AM
All original factory 375 Win/Big Bore barrels including Savage, Ruger, Winchester, and Marlin used a 1/12" twist barrel.
What Powder and Velocity are you using?

Mine does pretty well with Lyman #375248 and 25 grs. of 4227
Gemsbok405
03-30-2016, 04:58 AM
I use the RCBS 37-250 sized 0.376 and shoots well with somchem S335 (similar 3031) with 30 gr right on 1500 fps.

In my Ruger #3

No leading at all

Pays to seat the bullet "long", as with standard crimp front band of bullet is not in throat, and has to 'bounce' into throat.

Busy with a custom 275gr mountain mould bullet designed without crimp groove to seat long.