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375 Winchester
- Thread starter ruger357w
- Start date
Mike Irwin
Staff
Not loaded to .375 pressure levels it wouldn't be.
The .375 is beefier through the head and lower case walls than the .38-55.
Trying to run .38-55 brass to the same pressures as .375 could result in case separations or even case failures.
Starline sells .375 brass, but it's currently backordered.
Arthur Brown has it in stock, but it's made from .30-30 brass.
https://www.eabco.net/375-Winchester-Brass-for-Reloading-50_p_13543.html
Were I you, I'd stick with using reformed .30-30 brass. It's beefier through the head dimensions than .38-55 brass.
The .375 is beefier through the head and lower case walls than the .38-55.
Trying to run .38-55 brass to the same pressures as .375 could result in case separations or even case failures.
Starline sells .375 brass, but it's currently backordered.
Arthur Brown has it in stock, but it's made from .30-30 brass.
https://www.eabco.net/375-Winchester-Brass-for-Reloading-50_p_13543.html
Were I you, I'd stick with using reformed .30-30 brass. It's beefier through the head dimensions than .38-55 brass.
Mike Irwin
Staff
.32 Special would also be fine.
Now, I will add one caveat, but you should be OK...
Max pressure on both the .30-30 and the .32 Special is 42,000 PSI.
Max pressure on the .375 is 55,000 PSI.
Were I you, I'd keep my loads off top level just in case.
Now, I will add one caveat, but you should be OK...
Max pressure on both the .30-30 and the .32 Special is 42,000 PSI.
Max pressure on the .375 is 55,000 PSI.
Were I you, I'd keep my loads off top level just in case.
As I remember, .38x55 brass is longer than .375, .32 Win.Spl, .30-30.Wondering if it would be safe to use 38-55 brass in my marlin 375 Winchester? I have very little 375 brass for it. Have have run a few 30-30 case in it. Thanks for any information
So, if you are trying to use .38x55 in a lever action, and you have .375 Win dies, it would have to be trimmed to be able to crimp in the bullet's crimping groove.
Mike Irwin
Staff
"As I remember, .38x55 brass is longer than .375, .32 Win.Spl, .30-30.
So, if you are trying to use .38x55 in a lever action, and you have .375 Win dies, it would have to be trimmed to be able to crimp in the bullet's crimping groove. "
.38-55 is longer than .375.
So are blown out .30-30 and .32 Special.
ALL have to be trimmed to proper length.
But that doesn't negate the fact that the .38-55 case isn't as strong through the head and lower case walls as any of the other rounds, so if .38-55 is repurposes to .375, loads need to be kept on the milder side.
So, if you are trying to use .38x55 in a lever action, and you have .375 Win dies, it would have to be trimmed to be able to crimp in the bullet's crimping groove. "
.38-55 is longer than .375.
So are blown out .30-30 and .32 Special.
ALL have to be trimmed to proper length.
But that doesn't negate the fact that the .38-55 case isn't as strong through the head and lower case walls as any of the other rounds, so if .38-55 is repurposes to .375, loads need to be kept on the milder side.