Within normal for the 98 actions - probably in the 57,000 to 60,000 psi range - maybe 65,000PSI - 6mm Rem or. .270Win. - type pressures? The brass doesn't mind.

I was shooting the 160gr. TSX at 2,700fps using H4350 - seems to me, id I remember the powder correctly. Seems to me I got the data from a Brian Pierce or perhaps a Barnsness article in Handloader magazine.

The 6.5x55 data I worked up for myself in a new barreled, M96. Today, I'd likely prefer a simple 160RN at about 2,450fps to 2,500fps - easily achieved with H450 or some other slow powders. The 2,500fps with 160's duplicates Norma factory 156gr. ammunition for expansion. That is how I developed the 129gr. and 140gr. loads, using case web expansion on Norma factory ammo for the limits on Norma, RP and Fed brass. CIP standards for these rounds is 55,00PSI for the 6.5 and 57,000psi for the 7mm, 8mm and 9.3x62.
My current 6.5x55 is a like new M96, 5 groove 23.4" m38, I guess they are called. I am going to leave it an iron sighted rifle, unless I can find a scope mount for the rear-sight base. Had one on the last M96 I had and foolishly sold - that is the one I developed the ammo for.