The 6.5x55 is SAAMI registered at 51,000 psi max average pressure.
Quickload thinks the max is 55,114 psi, maybe they are using CIP standards for this.
I like Nosler 120 gr Ballistic tip bullets.
Nosler 5th edition 2002 says 47gr H4350
Quickload thinks that load is 53,879 psi
I have Swedish Mausers with 18", 29", and 24" barrels.
Quickload thinks that is 2917 fps with 24" barrel.
But I want to run 67,000 psi, moly coat the bullet, and my jug of H4350 is 4% slower than the QL library.
So I would do 45 gr H4895 for 3120 fps