Thread: .357 load data
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Old 08-01-2020, 11:12 AM
MA5177 MA5177 is offline
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Quote:
Originally Posted by Rizzo View Post
I just went through a pretty lengthy load data workup using a Sierra Sportsmaster 158 grain JSP bullet.
I used Blue Dot, 2400, IMR4227 and H110 powders.
Each with five different loads.
All set at 1.570" COAL
I am shooting from my Henry Big Boy Steel 357 mag rifle.
I chrono'd them as well.

It is amazing how much difference there is in groupings from the different loads of the different powders.

Sometimes just a few 1/10s of a grain noticeably changed the grouping.

So, what I am basically saying is that you should take the time and load up some different loads and go to the range and see how they perform.

I ended up with 15.5 grains of H110 at 1.570" as my best groupings.
I shot all of them at 75 yards but ultimately made my decision on what had the tightest group at 100 yards.

By just using a load you got recommended on the net may work fine, but you may also be wondering if 15.8 grains might give you better accuracy.

Take the time and work up as load, then you KNOW.
Then you can confidently repeat that load in the future.

Good luck to you.
From

Thank you!! 15.5 was what I was originally thinking and I will be able to load all 450 bullets I have with one pound of H110 at that charge

As far as accuracy... I done really care, because I will be shooting these out of a 4” model 66 IF I ever shoot them. I will probably shoot 20-30 for testing and put the rest on the shelf.
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