It depends on the gun and what you use to protect the inside of your barrel,
I use a 50/50 mix of alcohol and Hoppes #9 to clean and Montana X treme Bore protector. I shoot till I am done before cleaning with BH209 and with a clean barrel [the way I hunt] it will shoot a half inch right and a half inch high. Since it is with in a minute of deer even at 200 yds I don't worry about it. I tried a lot of combinations and the only other one that gave these kind of results was with Birchwood Casey synthetic oil, but it is harder to get completely out of the bore before you load. Lee