Another thing to add:
If I end up using grain-fed suet for pemmican, for about 4 days total, will that be a problem? Or is it just less optimal?
If it makes any difference I can get grass-fed bones with marrow, which I think can be used to make pemmican. However, I know that suet would be a better deal, since with marrow bones you pay for mostly bone weight. Most places around here aren't going to have any suet until summer.