357 load question

Bis · Post by **Bis** » Sat Apr 26, 2008 1:24 pm

I am going to try loading some Rem. 158 grain JSP with Win. 296 powder. They will be used in a Ruger GP 100 and my Marlin 1894.
My problem is since I am using 296 and from what I understand there is not much room to play with charge weights I need to know the min/max loads.
I have looked at the following loads from different manfactures.

Win. max 16.6 grains

Speer 13.2-14.7 grains

Sierra (rifle) 15.0-17.0 grains

Sierra (pistol) 15.9-17.3 grains

Nosler 13.8-14.8 grains

Any ideas?

Thanks

Terry Murbach · Post by **Terry Murbach** » Sat Apr 26, 2008 1:56 pm

TOSS OUT THE LOWEST LOAD, TOSS OUT THE HIGHEST LOAD, AND AVERAGE THE REST TO KNOW WHERE TO START AND MAYBE WHERE TO END.

Bis · Post by **Bis** » Sat Apr 26, 2008 2:15 pm

Since the high is 17.3 and the low is 13.2, I subtracted the 2 and came up with 4.1 and then divided by 2 = 2.05 then added that to the lowest for 15.25 grains. I figure that is not much above the lowest max and right in line with Sierra data. If I don't hear form anyone I will load a few and see how things go.

Does that seem like a reasonable way to figure this out?

Cast Bullet Hunter · Post by **Cast Bullet Hunter** » Sat Apr 26, 2008 3:36 pm

When in doubt, use the powder manufacturers data. Also, follow their cautions. In this case it is to not reduce more than 3% from maximun. That makes minimum 16.1 gr. and maximum 16.6 gr.

Bis · Post by **Bis** » Sat Apr 26, 2008 5:34 pm

I agree the the powder manufacture probably knows best, it just seems strange that the min load from Win. is 1.4 grains higher than the max load from Speer.

Jaguarundi · Post by **Jaguarundi** » Sat Apr 26, 2008 5:41 pm

Bis-The bullets have slightly different bearing surface tapers and diameters among manufactures.Also the difference in seating depth and crimp groove are not the same for the different bullets.

centershot · Post by **centershot** » Sat Apr 26, 2008 5:44 pm

Cast Bullet Huntyer beat me to it! Winchester is VERY specific about charge weights for 296. This is my "Go-To" powder for magnum handgun loads and I use it just like the manual says. It has always given me high velocity and sterling accuracy, it's a hard one to beat!

centershot

Bis · Post by **Bis** » Sat Apr 26, 2008 5:53 pm

Maybe I should write Winchester and ask them what they suggest since the data is for a 158 grain HDY Xtp and I am using a Rem. 158 grain JSP.