POA/POI adjusting before deep cleaning?

[RiverRoost]

Going to try a Jeb's .660 in my SX3 as soon as temps warm up but I've read several reviews of folks jebs POI/POA being off compared to what they were previously sighted in for before the jebs. Curious if I should shoot a couple of birdshot shells to check the POA/POI with a dirty barrel and THEN go back and deep clean my barrel before I do my initial pattern testing? Just trying to do this process of cleaning and shooting the most efficient way possible for time and shells.