Maybe some one can tell me why? I have only been loading BP for short time. I am using a Remington Rolling Block #1 with a new Green Mountain Barrel with a 45-70, 1-18 twist, 34" long with a Brooks 535 boolit and lube by Paul Matthews I have read all I can get my hands on when I started loading with Black Powder. (even You-Tube) about 90% say you got to use a drop tube. I have tried with and with-out. I can not see any difference. I put in 70 gr of Goex FFg. It is compressed down to almost .400. The 535 boolit is seated to 2.955 OAL. In any match, it will hold it's on. Was told to try Swiss, it may like it better.....