.357 load data

[MA5177]

So I have 500 sp magnum primers sitting around so I decided to put together some full house .357.

Bought some brass here , a pound of H110 and a box of Speer 158g JHP.

Looking at my Lyman manual and the data from Hodgdon, there is a big difference.

Hodgdon says 15-16.7grains and Lyman says 16-17.3.

I don’t need these to be mega flame throwers, just decent full house 357 to keep around.

I don’t really have a lot of time to go back and forth to the range to work up a load, I was thinking 15.5 if H110 should do the trick? What is your favorite 158g .357 load ?

[Kokopelli]

Thanks for opening this topic as I'm also getting ready to reload .357 magnum using H110. I have 100 each, 158 grain JHP in Remington, Hornady and Sierra brands and a bucket of once fired brass. I have not developed any loads yet.

Here is one old thread that mentions H110 handloads for 357 magnum. https://www.calguns.net/calgunforum/....php?t=1058253 See post #6.

Following.

[Sandspider500]

357 mag
Winchester case
Winchester SPM
158gr Speer JHP
1.560 OAL
H110
START 14gr 27,700psi
14.2 28,200psi
14.4 28,800psi
14.6 29,400psi
14.8. 30,0000psi
15 30,600psi
15.2 31,200psi
15.4 31,700psi
15.6 32,300psi
15.8 32,900psi
16gr 33,500psi
16.2 34,100psi
16.4 34,700psi
MAX 16.5 35,000psi

[MA5177]

357 mag
Winchester case
Winchester SPM
158gr Speer JHP
1.560 OAL
H110
START 14gr 27,700psi
14.2 28,200psi
14.4 28,800psi
14.6 29,400psi
14.8. 30,0000psi
15 30,600psi
15.2 31,200psi
15.4 31,700psi
15.6 32,300psi
15.8 32,900psi
16gr 33,500psi
16.2 34,100psi
16.4 34,700psi
MAX 16.5 35,000psi

Thanks, I think 15.5 will be my load

[Cowboy T]

Since you're using a Speer bullet, I checked with Speer's Web site. Turns out they've got handloading data for your specific bullet.

For Hodgdon H110, the minimum is 13.9gr, and the max is 15.5, for all Speer 158gr jacketed bullets (TMJ, JHP, etc.).

Now, since you also ask about our favorite loads, mine happens to be 13.8gr of 2400 under a 158gr LRNFP. It's about "3/4 house" power, not quite full, but still plenty of fun.

[NeilMo]

Here's a page from the Midway 357 loadmap. If you want to use other powders you can download the entire pdf file here.

[MA5177]

Since you're using a Speer bullet, I checked with Speer's Web site. Turns out they've got handloading data for your specific bullet.

For Hodgdon H110, the minimum is 13.9gr, and the max is 15.5, for all Speer 158gr jacketed bullets (TMJ, JHP, etc.).

Now, since you also ask about our favorite loads, mine happens to be 13.8gr of 2400 under a 158gr LRNFP. It's about "3/4 house" power, not quite full, but still plenty of fun.

Interesting... load data seems all over the place. Thanks!!

[vhuang168]

[pennstater]

Cowboy T is on to something. I also use 2400 as it seems more flexible in the .357. Tho I use 158 and 180 gr cast coated bullets.

MLC

[MA5177]

Cowboy T is on to something. I also use 2400 as it seems more flexible in the .357. Tho I use 158 and 180 gr cast coated bullets.

MLC

[MA5177]

[Rizzo]

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.

[MA5177]

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.

[eaglemike]

One thing to pay attention to - use the same brand of brass to develop your load.

Years ago I loaded some hot .357, and they worked fine. I changed brass with the same load later on, and I had to work at it to get them out of the cylinder. Yes, my fault.


good luck!

[MA5177]

One thing to pay attention to - use the same brand of brass to develop your load.

Years ago I loaded some hot .357, and they worked fine. I changed brass with the same load later on, and I had to work at it to get them out of the cylinder. Yes, my fault.


good luck!

The brass I bought is all mixed headstamp. I decided to go with 15.3 g of H110 to keep it under max. Thanks all, gunna go shoot a few this week to try out