Of course you can bore sight any bolt action rifle once you remove the bolt. How about a semi-auto, pump, or even a lever gun? I've owned an used a collimator (like the one shown below) for somewhere over 20 years now. It has multiple arbors that slide into the barrel and then allow you to see the crosshairs against a grid in the instrument.
Bottom line is that it works and works very well. First shot on paper @ 50 yards and after that, it's up to the individual's skill level as to how long it will take that rifle to be "hunt ready". I'll say this, any rifle "sighted in completely with 3 shots" is not going hunting with me, period
This instrument can also be used when replacing a scope on a rifle already sighted in.
Insert the device, note where the "sighted" scope's crosshairs show on the grid and make note. Leave the collimator in the barrel, remove the old scope, replace with the new scope and set it's crosshairs to exactly the same position on the grid. I've used this instrument to bore sight somewhere north of 150 rifles/scopes since I have owned it. And it works! It works so well that I never utilize the old sight through the barrel
and match to scope on any bolt rifles anymore as this is better
. I wouldn't even think about removing a Marlin's bolt, as it works way better, way faster