[9mm 1911 mainspring weight?]

Thanks for all the replies.  I was asking just for mainspring since I was planning on grabbing a bunch of different recoil springs and doing double drills to select the best one for my ammo.

 

For those wondering I'm using a 125 round nosed Blue Bullet seated at 1.135 OAL making 133-135 power factor.

 

Thanks guys!

[9mm 1911 mainspring weight?]

Just getting into shooting my 9mm 1911 and wondering what weight spring do you recommend me trying for ammo which makes 135 power factor?