Pretty much all I've used for Ljungman loads (I have several M96 mausers) was 4064 and 4320.
If you have another 6.5X55 you have to segregate the different loadings. I have three clearly marked boxes, for the AG42B, the 96 and the 98 mauser. THe 98 gets the heavy (6.5 SKAN) loadings which are much hotter.
If you use surplus M41 ammo, make sure you clean out the gas tube well. I like to fire 5 or more rounds of non corrosive at the end of a run of surplus. I am not sure if it helps that much but it makes me feel better.
The best way to dis-assemble the bolt is IN the rifle. You can take the whole thing out, cover carrier and bolt, and separate it but you can end up launching the parts into the ceiling (just ask my wife where the dent next to the living room light came from
)
Safest way; move the cover up until it locks, remove the safety assembly (saftey lever on center and pull upwards) then press the action cover latch and let it disengage and move to the rear under control while still in the reciever rails. You'll save trouble.
If you are loading with stripper clips take the extra second and switch the rifle on safe, it'll prevent that latch from disengaging and guillotining your fingers!
I've never had Lungman or M1 thumb, but I know that Ljungam thumb would make the other injury seem downright enjoyable.
Oh, and keep people out of your ejection pattern. At my range a casing bounced off the wall, into the window and cracked it
Get some spared BEFORE you ned them. Springfield sporters has the cheapest and best. Get all the springs, and a couple extractors at least!
Have fun and take care of her, she's one of the best, most accurate semi autos ever made!