The manual states that you should load from slide lock as the sling shot method my not reliably chamber a round. If it's working for you I'd say you're good to go as some guns may be a little more temperamental than others. As long as you understand that it may not work and what the "appropriate" method is I think you'll be fine. In other words what you're doing is working for you and if it's not broke, don't fix it . I had a PM40 for a time and had no issues with "sling shotting" the slide.