Vtflyer06

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!

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