a bread knife....or just big knife works well....sharp....use a sawing motion....

having 1 person hold it works well too.

get some chalk to outline the rifle you're cutting out.

I love my case, but its really tight for 2 magnum rifles.....1 mag and 1 reg won't be aprob, or 2 regular, but 2mags is tight.

Cut out the rifle as 1 piece, that way if you ever want to just carry 1 rifle in it, you can use that blank insert in the hole...where the 2nd rifle is not...