I'm not talking about years, I'm talking about days. Open up your new box of pellets the day before hunting season and shoot a fowling shot thru your Chrono. Go hunting and keep gun loaded for two days. On the third day shoot it thru the Chrono. Then when your shocked at what you see, do the same test on paper at 200 yards. You will never use them again. I can't believe as much as you shoot, your not using a Chrono for many different reasons. I shoot at the most 10lbs of BH209 a year. That's when I'm testing new bullets. When I got nothing to test I'll shoot 1/2 that amount. I don't care how much money you have or don't have, I would switch to Smokeless powder for sure. And obviously by a NULA or something else rated for Smokeless.