Lyman's 48th, Modern Reloading & .357

[TheotherMikeG]

There's a pretty big difference in starting/max loads using 2400 in these 2 books. Also, Lyman doesn't list data for 158 gr lswc, which is the bullet I'm using.
Question #1 - Is Lyman's data real light or is Modern's data real heavy?
Question #2 - What is your preferred charge for target loads using 2400?

Thanks for your help from a reloading noob.

 

[strat81]

Huh?? Is this a question?

 

[TheotherMikeG]

Sorry, tried to edit and hit submit.

 

[John C]

The way I read it is that TheotherMikeG is looking at load data in both the Lyman 48th edition load manual and Lee's Modern Reloading, and sees a large difference in the max load for .357 using 2400 powder. Plus, the Lyman manual doesn't show data for 158gr bullet, which is the bullet he's using.

My answer is that as modern pressure testing data has become widely available, load data has been revised sharply downward starting in the late '70s and early '80s as companies began to pressure test the old standby loads. Look at the copyright dates of the manuals and see which is more current.

Your situation is a lot like having two compasses that differ slightly from one another. Which one is right? The solution is to have a third compass so you can go with the best two out of three. You might want to buy/borrow a third manual to give you more data points.

-John

 

[rcmodel]

SAAMI max pressure for the .357 Mag was also reduced to 35,000 from it's former 40,000 several years ago with the advent of smaller .357 guns.

Same for the .44 Mag, which I believe was also 40,000, but now is 36,000.

In some respects, todays maximum Magnum loads were yesterdays mid-range magnum loads.


rcmodel

 

[SDefender]

I have the same issue. The data I have downloaded from the powder manufacturers usually is higher than the Lyman's.