It's too late for you now, so leave it alone. What I like to do is shoot mine clean, dead clean, and cold with a super light coat of oil in the bore for rust protection. Shoot at least a 3 shot group, 5 is better, clean and cold. By the time you get it dead clean it will be cold again. Do this at least twice, if you can't get velocity while shooting the group do the whole string over again with the magnetospeed on it. Clean and cold, clean to bare steel between each shot. If you run a super light coat of oil for storage/rust protection make sure you do the exact routine every time. Then I will shoot at least a 3 shot group and 5 is better, to foul the barrel and by the 6th shot it's hot. Now fouled, shoot a couple of 3 shot groups, 5 shots is better, with a COLD barrel and do this at least two times. If you have a magnetospeed do this again to get velocity, if you got velocity from those group shots great. This takes a while with a 28, that 6 shot group gets it HOT. Bring another rifle or 2. All testing is done on separate aiming points. I will compare the targets and see what the difference is in accuracy and precision for clean and cold vs fouled and cold. Look at your velocities and see how much slower your clean and cold is vs fouled and cold. Now you have the information to decide which way will work better for you. If clean and cold is not a big change from fouled I hunt clean and cold, and account for the change in my dope. If it's a big difference, like MOA or more, I will hunt fouled. The important part is to do the same thing so you get the same predictable result, especially if you are going to push the distance much, 300 and in it probably won't matter much. My 28's are Browning, they are good to go clean and cold and only need a couple tenths adjustment. I have a clean cold profile for them and a fouled profile. The zero point and velocity is adjusted to compensate for the minor offset on the clean and cold profile, makes it super simple other than making sure you are using the right profile. I have other rifles that shoot terribly clean and cold and great fouled, there is no choice but to hunt them with fouled bores. One of the Savages I have I wouldn't shoot clean and cold at bow distances, fouled at least 8 shots it's easily under a minute out there a long long way. Like Tim's rifle, it goes to crap when shot too much also, this one about 80 rounds will get wild and start showing pressure rapidly. Don't know till you know.