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Originally Posted by Dfish1247
Ok fellas, I have a funky predicament, so bear with me.
I’d like to try a couple loads for 357 or 38 in 357 brass. I only have 357 brass and a few 357 maximums I could trim down to 357 mag length
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Do not trim down the 357 MAX, it will probably have smaller case capacity than 357 Mag
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And I don’t have any small pistol primers, but have small rifle primers.
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This is fine for the Unique and Bullseye. I only use Magnum primers with H110 and H110 only works well at Max or near Max loadings. I do not use 2400 so I can not comment on non-Magnum primers
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Bullets, I have roughly 75 hard cast lead 157gr, and a box of extreme 158gr copper coated.
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Unless the Lead projectiles have gas checks, they are not suitable for use with H110. I would not even use plated bullets with H110 as most should be kept under 1200 FPS according to their manufacturers
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So, from what I’ve read, loading 38 in 357 brass, I need to add 10% to the powder, but using srp, I need to cut 10% from the powder. I’m just looking for around 800-1000 fps tin can fun.
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You only need to increase the powder charge if your goal is to hit that published estimated velocity.
In other words a 38 powder charge in a 357 Magnum case will have a slightly lower velocity.
You do not need to do anything for the primer changes unless we are talking a MAX load, then it need to be re-worked anyway
Now for a few suggestions. For decades I have been shooting 5.5 grains of unique with a 150-158 grain hard cast SWC. Depending on your barrel length, this runs just under 1000 FPS when loaded into 357 cases
That same load can be used with your plated projectiles
Save your 2400 and H110 until you get a small supple of Jackated projectiles