You will have no problem shooting the +p ammunition in your model 70. The Roberts was hobbled to a lower pressure due to the abundance of builds from Mauser and Arisaka actions
I just ordered a black gold Mountain Light three pin slider. I was a down to that or a viper driver Q4. In the end I went with the black gold because of the dual indicators
Not a 358 Norma but I had Montana Rifle build me a 358 STA On a 1917 Remington Enfield about 20 years ago. 23” 1/10 twist barrel shot 3/4 moa with 225 and 250 Barnes X bullets and IMR 7828 with very little load development.
Smoke them whole with no seasoning when they are done shred the meat and package it in what ever size you like. I usually put a couple pounds in each package. Season the meat however you like for what ever dish you are making.
Tacos
Enchiladas
Fajitas