New Sig P320 X5 looking for 9mm 147gr bulltet for reloading

[kmaultsby]

Hello all,  Looking for suggestions on trying for my new X5.  I have been shooting Xtreme 9mm 147gr RN but my dillion and using Hornady seating die is deforming round nose bullets.

[chubs]

I'd recommend looking under "general reloading", tons of info

[MikeyScuba]

fyi: I've read that most find the 124's to be more accurate out of a X5.

[Boomstick303]

There is a lot on the forum about the lack of accuracy for the stock P320 barrels using 147 gr bullets at Power Factors (PF) of around 130.  The bullet is traveling too slow.    

 

I have done extensive testing to figure this out and it seems to come down to velocity.  To get any bullet to be accurate I found a minimum of 1050 FPS was required regardless of the bullet weight.  The barrel seems to hate slower velocities which 147 gr bullets get loaded to for 125 -130 PF.  I found the faster the bullet out that barrel the more accurate it tends to be proven through groupings and testing at different velocities.  I also noted a rather large change in Point of Impact shift when shifting between ammo that have vastly different velocities.  

 

Keep in mind this is with the stock barrels.  I did not see this with the Barstow after market barrels I have switched to.  

 

I load just about any ammo to at least 1100 FPS with 124gr bullets to ensure accuracy and that I make PF when traveling to Level 2 and up matches that chrono ammo. 

 

 

[GlockCanMan]

I am using a 147gr bullet with 3.2gr of N320.  good results so far. 

 

On your seating die, you should have a separate seater, one for RN, and another for Flat nose.

[RangerTrace]

124 all day long out of the P320.  GGI says so.  Accuracy is as good as a 2011.