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Joined: Sep 2008
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I recently acquired a very nice Marlin chambered in 375 Win. Luckily I got a little over 50 rounds of 375 ammo with it. Anyway, I’ve been researching less expensive ammo to do a little pleasure shooting with and the prospect of shooting all lead 38-55 rounds in it comes up. In fact one company swears its perfectly safe to use their 38-55 ammo in a rifle chambered for 375 Win. Has anyone personally done this or have any first hand knowledge of it being done and being safe?

BP-B2

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I have done it many times. I have a Marlin .375 and while I have a few hundred .375 Win cases and about 10 boxes of factory ammo, I reserve those cases for jacketed bullets. I like the 38-55 cases for cast bullets because they are slightly thinner and it is easy to fit a cast bullet that is slightly larger in diameter. My Marlin likes cast bullets that are .379 but shoots jacketed bullets that are .375 just fine. The 220 grain Hornady is a great deer bullet if you can find some. The company you are referring to must be Buffalo Bore and I agree with their info.

I used the formula that Ross Seyfreid use to write about to come up with a cast bullet load. He wrote that you can use 40% of the black powder weight of 4198 (either one). 40% of 55 is 22, and while that works, experimentation revealed that 20 grains is more accurate in my rifle. I have also stopped using the filler he wrote about because I could see no difference in accuracy. I mostly shoot the Lasercast 240 grain cast bullets in those loads and they have managed some one inch groups at 75 yards, with my elbows on the bench but the gun in my hands. I think that gives me a better approximation of what I can do from improvised rests in the field than putting the gun on sand bags.

Just wanted to add that 8 grains of Red Dot with the 240 grain cast bullet is an accurate small game and plinking load that is fun to shoot.

Last edited by doubletap; 11/14/18.

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Check out buffalo bore website pretty good article about this topics.


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They are two different cartridges.

They are close enough that it really depends on how you load it. BB really gives a lot of detail on bullet diameter and bullet type that they choose when loading their ammo. I am convinced that it is safe to shoot their .38-55 ammo in a .375.

This does not mean that it is a good idea to shoot just any .38-55 ammo in every .375. And it definitely is not ok to shoot .375 Winchester ammo in just any .38-55 rifle. Maybe some, but certainly not all. Bullet diameter, bullet type and hardness as well as powder choice and the bore diameter of the rifle all have an effect on pressure. Some rifle designs can handle more pressure than others.

It really depends on the details of the specific cartridge and the specific rifle. When in doubt stick with the ammunition with the correct head stamp for the rifle it was chambered for.


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Thank you gentlemen. Hope y’all have a great Thanksgiving.

IC B2

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Check with Starline . They just recently produced new 375 Win brass. $145 for 250 cases. In stock now.

Last edited by Hesp; 12/18/18.

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