The woulda, coulda, shoulda's don't do you any good now and I am the last person to turn anyone away from this great sport of ours. Since you don't have time to patter the gun keep your shot under 40 yards! Think safety first! Look beyond the target and make sure a stray pellet will not be a threat to anyone or anything else! At 4o yards and under you shouldn't have any problems with the pattern. Shoot for the vitals like you would with any shot! Do us all a favor and pattern the gun with the shot you'll be using when hunting asap! Safety first! To tell you the truth the best move would be to start your hunt an hour late and take the time to pattern the gun before going! Good luck....be smart....be SAFE!