I don't know the torque but just hand tighten. If you were really shooting for accuracy, the trigger guard screws should not be over tightened. For what you're doing, I wouldn't worry. I just don't want them to back out when I'm shooting!Be careful not to over tighten the barrel band screws also. Gives the barrel a little breathing room to absorb some vibrations with shooting. Not a big deal, again, with what you are working for.

Don't worry about over loading the reloads with normal loading recommendations. The 30-40 round is very easy on the shoulder and the Krag can handle it fine. You can look through the reloading category of this blog and find lots of good information about reloading. Lots of fun!