I am no Ruger #1 fan. The trigger, scope, LOP, my eye, my neck never seem to get in a rythym to hit well with. That said enjoy your new find, cool stuff.

I use the 350 Woodliegh's with 70 H4350 for around 2200-2300fps. I have found this to be plenty of velocity, hell anything over about 2000 is good with me.

With 270's I use 70gr RL15
With 300's I use 64gr Varget

load the 350s and zero the "new" Zkk for them and use the 270 and 300 in the scoped gun. When you get tired of the #1

sell that and the M-70 and get a CZ in 404 and one in 458. Then all you need is a 500jeffery and a 257bob