Anyone else hanloading for the .375 Win. ? I'm curious about loads as there aren't very many in the books.

I have many reloading manuals and all have a good amount of data for that caliber. Should be plenty to get you up and running. All the powder companies and several bullet Mfg have resourses online to give you needed help.

I have four different mauals and all have pretty much the same info for the same bullet from Speer , Hornady and Sierra for a 200gr bullet which does not shoot well from my Win 94 BB . The only bullet I've foun so far has come from Beartooth bullets as a 250gr hardcast gascheck with a diameter sized to .378 at a velocity of 1900fps ,I'd prefer a 200gr with more velocity but can't seem to find anything. The factory ammo from Winchester was garbage as I couldn't keep shots on a 12" target at 50yds the BTB 250's and a load of RE7 at least will touch each other at 50 yds!

Factory bullets are all .375 in and that would be of concern if your bore slugs .378 or larger, which often is the case. When you find the bore diameter of your gun you will have to search for compatibale cast slugs. But the powder choices are the same for cast bullets and I think 2000 fps for a 200 grain cast bullet should be doable. 38-55 data is also useable but velocity will be a bit less

Outa my dozen or so manuals, I, as rb, find that there is lil' data available for the .375 Win.. However, rb, I did find that Ammoguide does have 68 loads listed for the round, in bullet wieghts from 200 gr. to 264 gr.. If you are the type of Firearms Enthusiast, such as my self, that does shoot and reload for several obsolete, or unusual firearms, give  www.ammoguide.com
a look! If ya would rather, ya could drop me a line at allen_hoffman@yahoo.com  and I would print the data off and send it to ya.

Thanks hoffman, I'll lookup ammoguide and see whats there. I slugged the bore and found it to be .3778 and pulled some bullets from the factory Winchester stuff and it was .372-.373 so already undersize for the bore but OAL cartridge length also varied as much as 30 thousandths and velocity through the chono varied up to 100fps , I called and e-mailed Winchester and never got a response so I'll probably quit buying their ammo altogether. I wondered if perhaps they used the old 38-55 specs for the barrel bore and chamber cause I seem to be able to seat the bullets out far beyond the cannelure before touching the rifling .

The proper diameter bullet for your gun can be purchased from David Deering at Custom Bullets of ST. Pete Florida. Give him a call at 727-322-2615.
I quess sufficent data is a subjective issue. What is sufficent for me may not be for you. In looking at just 3 of my manuals I found 64 loads with 13 powders and 9 bullets. If that ain't enough to get ya up and runnin more data ain't probly gonna help.

According to the data that I have, the Win., mdl 94, .375 Win. had a bore dia. of .376. The .38/55 has a bore dia. of .379. You will not have any problem useing lead bullets, cast for the .38/55. Just start low, and work your way up, looking for pressure signs.  After all, the Savage, .303, shot a .311 bullet thru a  .308 barrel!! And of course, this was done back in the days when all bullets were lead!!
I do shoot primarly lead myself. I resize at minumum of .002 over bore! You have to realize that by shooting a 200 gr. bullet thru  a .376 bore, that it is almost immposable to stabalize, because the actual body of the bullet that seats into the rifleings
is not as long as the dia. of the bullet. The heavier bullet that you use, the more of the length of the body against the rifleings, which is what stabalizes the bullet.! My Bud, who also shoots a .375 Win. has found that his most accurate bullet is a 260 gr. gced lead bullet from one of his Lyman moulds. He shoots a fairly consistant 2" group at 100 yards! 'Nuthin' fancy, but it is MOdeer.
I have 27 differant reloading manuals, of which 22 are from 1926 'till 1958. Those manuals pretty well took care of the guns that I had, when I first started reloading, 60 years ago. However in recent years, I have traded for a few newer calibres that have required me to up date. I have had to buy a few more(5) manuals to cover these newer firearms. If you have 3 differant manuals that will give 64 differant loads for the .375, please tell which manuals these are, so that I can add them to my collection!!

Hodgdon Powder usually has a good bit of quality loading info both in print and on the net and is easy to come by. Their annual nanual has several suggestions. The load book no 26 has 3 pages of data from pg 448 to 451 including bullet weights from 200 to 255 gr. Including powders from Hodgdons, IMR, WW and reloader Powders include. H335, H4198, H4895, H322, IMR 4895, IMR4198, IMR4064, IMR3031,WW748 and R-7. The Accurate Arms manual #2 has three powders listed with several bullet weights including cast bullet. Cartridges of the World has 8 loads listed. All .375 Winchwster data. A fair amt of data is also listed for the 38-55 Win and that data can be used in the .375 Win as well.
Gives ya some sort of place to start I think.
The .375 is an easy case to load and fun to boot. Way under rated I think.
Load books usa has data as well I believe and so does the oldT/C Contender manuals. BTW the T?C Contender and Encore barrels are all .375 inch bores and factory bullets are good in them. Bore diameters larger than that need to be slugged and the use of properly sized bullets need to be used if any accuracy is expected. But bore size is a bullet issue not a powder issue and data for .375 in bullets can certainly be used for ,378/.379 inch slugs. Some powders will work better with cast bullets in my experience however.
Some lever guns require close attention to AOL and bullet design/profile for feed/function that single shots do not have issue with.
If I were to choose a place to start it would be with H322 of Re7 and cast boolits in the 250 range.
My 2 pennies

Thanks guys I'll have to look for some new manuals the only loads I have are for 200 and 220 gr bullets I'm currently using RE7 with 250gr Beartooth gaschecked hard cast bullets sized to .378 and they work pretty good . I would like to find some 200gr gas ckd bullets at the proper dia. like I said when I pulled the Winchester loads and miked them they were way undersize and OAL varied a lot! probably why they shot like I was blind or drunk or a combination of both! Still at $38.00 a box you'd think they would pay attention to something like that !

While too pricy for plinking, try Hawk bullets for hunting. they are available in odd bores and impeccably reliable in their expansion.
Sounds like a 38-55 barrel, but is the chamber a 375 Win or a 38-55? If the larger bullets are a slip-fit in the fired cases, you have no problem. If not you may need to ream the neck areas to the depth of the bullet to prevent excessive pressures.

Went to a gunshow in town and looked for some ammo for the .375 Win. GOODLORD ! $52.00 a box for Win factory ammo ! I'll definately reload from now on . There's NO excuse for those prices .

Had my brother inlaw load up some 220gr.Hornady flat points with Reloader #7 and Winchester primers. shoot great in my M-375 Marlin.