I used to use the action screws, but do not any more - just headless aligning pins on the action and electrical tape around the front of the receiver and stock - goes, for me, to the idea that the point of epoxy bedding is to get the action and barrel laying in that epoxy bed with no tension - no twists or humps from tightened screws ... there are usually a couple wraps of that same electrician's vinyl tape around the barrel - near the forearm tip - to ensure barrel free float and that it is centered in the barrel channel - but I might be all wrong about that.
One of the more accurate hunting rifles that I did was a Remington 788 in 243 Win - that one was solid epoxy bedded from rear tang tip to forearm tip - and that one used the action screws - still not sure if it shot well because of my fussing, or in spite of it - I did that one before I heard to shoot a couple 5 shot groups first, then repeat with same loads done after - prove to self whether that job actually improved anything.
I now doubt the way I did it. I used action screws to tighten, then wrapped with surgical tubes, and then loosened the action screws. Learned from Youtube.