147 bayou load question on 4.25" M&P

[ghertz]

I've always run a 5" m&p9L with 147gr bayou, 3.2gr n320 at 1.125 OAL and it's been a good load for me (134 pf). I recently picked up a 4.25" M&P and I was wondering how the shorter barrel length will change the velocity?

[Hi-Power Jack]

All else being equal, you should lose c 40 - 50 fps, but everything else is

NOT Equal.

So, you could conceivably end up with higher velocity with the shorter

barrel - depends on the individual barrel.

Isn't life great?

[ghertz]

anyone have load data for a 4.25" M&P with bayou 147s and n320?

[fltbed]

Looks to me like you already have the load data. You just need to chrono.

There are just to many variables involved for any of us to say what velocity you’ll get.

Jeff

[GlockCanMan]

You should still be above the 125 power factor, but your POI will be different.