New to the forum and pretty new to shooting. After renting a few times I finally purchased my first handgun a Ruger SR40. After cleaning it yesterday I loaded up the mag with 15rds and tried to insert into the mag well. It wouldn't load with the slide forward (mag stuck down about 1" or so) so I locked the slide and it went right in. After chambering a round I removed the mag to add another round giving me the 15+1. It still would not insert with the 15rds and takes a "push" to get it in with even 14rds. Am i doing something wrong? Help/advice is greatly appreciated.