Me and a grandson are preparing to hunt deer in another week here in Missouri. He is using a 303 British in a No. 4 MK 1 using 30 grains of H-4895 under a Lyman 314299 at 200 grains gas checked and I am using an 1885 Browning in 45-70 shooting a 300 grain gas checked RCBS over 30 grains of H4198. My question is, what condition should the gun be in when making that first shot at a deer? Cleaned and oiled barrel? Cleaned and oil wiped out of the barrel before the hunt? Or barrel wiped out of oil and fired once to foul the barrel?