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Store » All Rifle Cases

#382125 - 38-55 Long Brass (2.125) (Large Rifle primer)

38-55 Win, 38-55 Winchester, 38-55 (2.125), 38-55 Ballard

This is a .38-55 case with the original overall length of 2.125" for use in .38-55's that are suited for longer cases (most firearms will accept this length). Wall thickness at the mouth averages .0072" which allows for use of a wider variety of bullet diameters, especially in tight chamber/large bore situations.

For tips on choosing which length case to go with, click here to read our article "Loading with Correct 38-55 Winchester Cases"



* Starline Brass does not sell any loaded ammunition. What you are purchasing are brass cases only and will need to be loaded into ammunition in order to be fired from a firearm.


Average rating

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Garth Huff
Green River, Wyoming
February 13, 2019
Product Review
Really uniform. Older guns, cast bullets and black powder need the longer, thinner cases. Starlings is the only brass that fills the bill.
Carl Zmuda
Sandpoint, Idaho
August 15, 2017
Product Review
My recently acquired Marlin 336CB in 38/55 works great using Starline 2.125" cases and Lyman # 380681 cast bullets sized .381!
Carl Schmidt
Boothbay, Maine
August 06, 2017
Product Review
I just ordered my second box of these 38-55 long cases. The consistency and accuracy have been unbelievable. Great product.
Gary P
South Texas, Texas
November 08, 2016
Product Review
Last order I bought 250 of these long brass for my Marlin M1893. It is typical Marlin with a 0.381" bore and this brass is perfect for the task. It will shoot 1.25" at 50 yds with open sights and a cast 260 grn bullet sized to 0.382". Starline is top quality from the start for all my needs.
Lunar phase
South, Florida
February 19, 2015
Product Review
Starline is the only Brass that chambers in my Marlin 336CB's with the Ranchdog bullets I cast. If you are shooting a Marlin 336CB in 38-55 you know that they prefer a fatter cast bullet, this brass is what you want. Don't waist your money or time on anything else. For the Marlin 336CB in 38-55 this is the better length of brass.
W. Beaty
Fort Worth, Texas
February 16, 2015
Product Review
I've been using this brass[long] for several years in my Marlin Cowboys.They both require .381 bullets and this excellent brass works perfectly.My loaded rounds chamber and shoot much better that I can hold......kudos to Starline,you have my business for life. Thanks, W.Besty