375 win jes rebore

Roger Allen

Active Member
Today I picked up my second one. The first one I owned had a generous throat that fit a 38-275s fine at the crimp groove using starline short 38-55 brass. Today the one I picked up the throat on this one is short short. Now I did in fact get mine to function by seating past the crimp groove.
 

oscarflytyer

Well-Known Member
Have a Marlin 30-30 Texan donor rifle sitting in the safe. Gotta stop buying old Colt and Smith wheel guns and send the dang thing to Jess to grow up to be a 38-55!
 

Roger Allen

Active Member
Oh yeah. Trust me tight throat or not I haven’t seen a more beautiful bore cut into something along time. Wonderful job I’m sure it’ll shoot good. 20.5-25.5 gr of imr 4198 38-55 short starline brass. I’m ready to go
 

oscarflytyer

Well-Known Member
so... 3, 4, or 5 groove? I will only shoot cast in mine. Right now have Lee dies. Jes doesn't think highly of them, iirc. Think the mold I have is a Lee also. not cast anything with it. and last, brass? Starline makes short and long, and I have considered fire forming 30-30. Thoughts/input welcome.
 

Roger Allen

Active Member
3 groove. The only thing I’ve shot in this caliber among several rifles is cast. I bought Lee dies as well and I had to Lapp out my crimp die as it was on the smallish side. The mold I have is 38-275s that acts like the Lyman 264 gr Bullet. Starline brass in the shorter variety is what I bought as to advoid the possibility of the long not chamber just save myself the extra money.
 

CZ93X62

Official forum enigma
My JES 38/55 re-bore (Win 94) is also a 3-groove, throat is .376" and a couple tenths. I size castings at .377" and they shoot VERY well--RCBS 250 FNGC, Lyman 255 FNGC, and the Lee 250 FN plain base. Zero leading with 92/6/2 alloy in the GC castings and with 30/1 Pb/Sn Lees. The Lees at 1300-1325 FPS are UBER ACCURATE.

For the record, Buckshot/Rick Tunell considers my Win 94's caliber to be a "37/55 Marlin & Ballard". Those guys with a number of 38/55s to their name get a mite put out about small-bore imitators of their pet chacoal burners. An exacting lot at times.
 

fiver

Well-Known Member
my RCBS die set is a 38-55 marlin ballard set.
it allows me to work with 379 diameter bullets which both the win 94 and marlin 375 both take just fine.
I'm also using the gas check 449 lyman mold since I'm shooting a 375 and not a 38-55 and pushing the rifles to that pressure point.
 

fiver

Well-Known Member
200-230 is about right.
that's what the round was designed to shoot anyway, I have been keeping an eye out for a decent 200-230gr mold for my revolver.
probably just gonna have to just pull some measurements and send Tom a check before it's said and done.
 

CZ93X62

Official forum enigma
The 250s at BP velocities (1300 FPS ballpark) aren't bad at all. Run them to 1600-1700 FPS in the Win 94, and they let you know about primer function.
 

fiver

Well-Known Member
yes they do..LOL.
the Marlin isn't so bad, the stock design really helps mitigate the recoil,
which is somewhat surprising since I have shot bullets just as heavy as the 449 in the 45 colt/44 mag. at the same 1600 fps. in a model 92 and it isn't nearly so bad.
 

Brad

Benevolent Overlord and site owner
Staff member
The Win 94 has far worse felt recoil than the Marlin.
My Win 94 with the 449 at 1500 is not very fun at all.
 

Roger Allen

Active Member
Well I shot it today. 50 yards open sights around 28 degrees f and 20 mph winds.

Starline short brass
Wolf lg rifle reg primers
Powder coated .380 sized
Imr 4198 powder
Accurate 38-275-s-

22.5 2 1/4 inch group 5 shot
23.5 1 1/2 inch group 5 shot
24.5 1 1/4 inch group 5 shot
25.5 1 1/4 inch group 5 shot
 

dale2242

Well-Known Member
I shot fivers Big Bore 94 in 375 Win a number of years ago and noticed it had it`s share of recoil....dale
 

fiver

Well-Known Member
it was pretty ramped up back then with AA-1680, those loads are all dedicated to the marlin now.. LOL
I thought I'd take that rifle Elk hunting and wanted to be able to take a 200 yd shot if necessary, airc I ended up shooting a cow with my 7x57 at like 80 yards.
then having to go wrangle a couple of H.S. boy's out of class to come help me get it out.
 

Brad

Benevolent Overlord and site owner
Staff member
1680 is a great powder for the 375 but not in low end loads. Been there, done that. Rattled my fillings.
 

oscarflytyer

Well-Known Member
Well I shot it today. 50 yards open sights around 28 degrees f and 20 mph winds.

Starline short brass
Wolf lg rifle reg primers
Powder coated .380 sized
Imr 4198 powder
Accurate 38-275-s-

22.5 2 1/4 inch group 5 shot
23.5 1 1/2 inch group 5 shot
24.5 1 1/4 inch group 5 shot
25.5 1 1/4 inch group 5 shot

Fantastic MOBrushD!!! (= Min of Brush Deer!!! lol!)
 

Roger Allen

Active Member
I believe my gun could stand to benifit from a smaller sized bullet. They typically have tight tight bores.

I’m going to scope this rifle I just don’t have the scope yet. Speaking of I need a 2-7 type scope or lower power even
 

Roger Allen

Active Member
Well yday I decided to scope it. Good to go. My boys and I went ahead and loaded 50 up.
 

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Eutectic

Active Member
I believe my gun could stand to benifit from a smaller sized bullet. They typically have tight tight bores.
You are probably correct. I have a Remington 788 that is a JES rebore to .38-55. 5 lands and grooves with .376" groove diameter. Chamber is snug too. I get neck impingement in the chamber at .379" bullet sizing with WW brass and almost no clearance even with Starline........ These are areas you can get high pressure from too tight. In your case maybe .377" sizing??