Most do not know that there are three 1911 magazine types that will produce defferent results.
The original magazine that was developed to function in the GI 1911 was a 7 round with tapered feed lip, in this configuration the rim of the cartridge would rise up as it was being stripped of the magazine by the slide allowing for a steeper trajectory and facilitating a quicker grab by the extractor, a very reliable design with FMJ 230 gr hard ball ammo.
In the middle of the 20th century the Hensley & Gibbs #68 projectile was introduced and thrown into the mix by bulls eye shooters and was dubbed the wadcutter, being a shorter cartridge with wider shoulders to cut wider holes in paper, the barrels throat need it to be modified by way of widening and also the magazine feed lip configuration was modified by way of shortening the feed lips to allow a quicker release and making the lips parallel to each other producing a lower projectile trajectory that make full contact with the feed ramp instead of a glancing impact as the tapered feed lip type.
In the 60's Colt had a stock pile of 7 round tapered lip magazine and to stay in the game and up with the time decided to modify them by shortening the lips to allow for a quick release while maintaining the tried and true integrity and attributes of the tapered feed lip, thous the hybrid feed lip magazine was born, a magazine that would raise the cartridge under the extractor at a steeper trajectory with the benefits of a quick release of the wadcutter, accommodating a wide array of cartridge lengths the best of both worlds.
The magazine on the left is the tapered feed lip hard ball type that is still available by some manufactures.
The magazine in the center is the hybrid feed lip that is offered by Colt and Checkmate Industries.
The magazine on the right is the straight feed lip quick release type that is included with most modern 1911
Steeper trajectory hybrid magazine
Lower trajectory wadcutter magazine
shoot safe, shoot straight and have fun