Just purchase it! - Maglula UpLULA Universal Pistol Magazine Speed Loader

I'm sure anyone who has loaded a magazine for their firearm eventually faces that soreness with their thumb. Yes, you can just rough it out but why when you have this device. It makes loading magazines a breeze. It's so good I bought it not only for my handgun but for my rifle. My local range had it for their customers, I tried it out and immediately ordered it when I got home. Maybe see if your range offers it to see for yourself but this will make your life easier!