loading plated .40sw

[sofbak]

Heres a question. Would using a mag primer in the .40 with power pistol in the short barrel help with the burning rate some and burn a bit more powder before the bullet leaves the barrel

This guy got some interesting results trying that:

http://www.defensivecarry.com/forum/reloading/77799-standard-vs-magnum-small-pistol-primers-my-experience.html

For the most part he saw a small increase in muzzle velocity and a tighter standard deviation on hits...

You might try it in "ladder mode", and see what it does. But without a chrono, I doubt you will be able to tell the difference by feel. Maybe some observable changes in accuracy-IDK. Start low and work up, and keep checking primers for pressure issues.

[kielbasavw]

I need to get a chrono. That would be cool.

[vstromer]

I am currently using 3.9 grains of 700x. Velocities in the 750 fps range and meet minimum power factor for IDPA AND USPSA. Very accurate and soft shooting. This is from an M&P 40.

I have been working with 700x in my m&p 40 also.
What sort of bullets are you using?

[hd-dude]

I have been working with 700x in my m&p 40 also.
What sort of bullets are you using?

Berry's 180 gr RS.

[Pauliedad]

Breaking out the chrono really changes a range visit.
Not good or bad, just different.
I'll set mine up so I can bench rest from a block. Also helps with validating the groupings as well as not shooting the chrono. Only downside is I feel a rush to get through the batches of what I'm shooting so I forget to just shoot for the fun of it.
Now once home and given some free time, its fun to analyze the data and see what's what. Makes me want to go back right out with some tweaked loads.