I am having trouble with bullets in the magazine not wanting to "pop up" correctly so that they can be chambered. The rear of the bullet seems to be lower than the front when in the magazine causing me to have to take my finger and play with it to get it in the proper alignment for the bolt to catch the rear of the cartridge and shove it into the chamber. Is this a problem that anyone can help me with? Is the problem that the gun is a cheaply built one? The caliber is 7mm Rem Mag. Any help would be greatly appreciated!