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Discussion Starter · #1 ·
I have a 78 Glenfield 30A which was rebored by Jesse to 375/38-55. I want to use a plain base 260gr. cast bullet with Alliant 2400 powder What powder charge will get me close to 1200-1300 fps?
I already have loads with jacketed bullets and other powders so am not interested in those . I'm using 375 Win brass. Just need a starting point with 2400.
Thanks!
 

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Discussion Starter · #2 ·
Thought I'd get a jump on the pic requestors! Here it is with an old Denver Redfield 4x- great scope on a great rifle! GF375-38-55.jpg
 

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Lyman's 4th edition Cast Handbook list 1500fps as the slowest load for 2400 at 19.5g.
1400fps is the slowest load listed.
38-55 brass may be a better choice for 12-1300fps loads.
And 2400 not listed for 38-55 in the Handbook.
 

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I have a 78 Glenfield 30A which was rebored by Jesse to 375/38-55. I want to use a plain base 260gr. cast bullet with Alliant 2400 powder What powder charge will get me close to 1200-1300 fps?
I already have loads with jacketed bullets and other powders so am not interested in those . I'm using 375 Win brass. Just need a starting point with 2400.
Thanks!
JK622,

2400 will work. However, at the pressures you need for 1200-1300 fps a better choice of powders would be shotgun powders like Unique, Herco, IMR Blue, and Blue Dot. Also, fast rifle powders like H or IMR 4198 or 5744. All are easy to ignite and burn completely at lower pressure. You may find 2400 needs more pressure to burn well and produce good accuracy. Magnum pistol powders do not perform as well as other options in large volume cases. 4227 is another that needs more pressure to burn completely.

You may find some guidance in the on-line load data links in my post, see attached. A good place to start is the old Ideal #38 manual.

load-data-and-references.628262

If intersted, use Unique load data to start for Herco. If you go with Blue or Blue Dot, it is all about volume. Use the same volume as Herco or Unique for a starting load. The Blues should weigh about 130% of the Unique/Herco weight to produce the same volume and repeat the pressure and performance.

With all, good loading processes are very important. All can be double charged and not overflow the case. Use a flashlight and look down the charged cases in your tray to ensure you do not have a double charge before putting a bullet on top, NO EXCEPTIONS. Make it a habit.

Be safe.
 
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Discussion Starter · #6 ·
Thanks. I may just stick with H4198- and I ALWAYS check all of my charged cases before I start seating bullets!
 

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I am using IMR4198 under a 250g Bearthooth bullet. I couldn’t find 2400 listed for the 38/55 when I looked last night.
 

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Discussion Starter · #8 ·
I thought I remembered seeing some reduced rifle loads using 2400 but I'm probably thinking of Unique(which I don't have any of!) Thanks anyway!
 

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Do you have any Trail Boss. I know there are some reduced loads using it.
 
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