I pretty much only carry and shoot 1911s these days, except for a DAO J frame at work. The four things that stand out here are the weight difference, barrel length, front sight, and grips.
First thing I would do is measure the heights of your front and rear sights. They may not necessarily be the same but you'd expect to see a similar ratio front to rear. If the Colt has an excessively tall front sight obviously you'll shoot low with it.
Second thing is to swap the grips and shoot each gun again and see how you group. That big fat Hogue rubber grip is going to position your hand completely different than when your shooting the S&W. Switch them around and see if the problem follows the grips.
As far as the weight and the barrel length, you can't change that, but the lighter/shorter gun will be more susceptible to any flinching you're doing in anticipation of the recoil. Certainly, the looser, lower grouping is suggestive of a flinch. As suggested, shooting the gun off sandbags or some other rest will keep it stable. Also, I'd shoot the Colt first each range session, while your fresh and less likely to flinch, and see what kind of groups you get.
Of course, having someone else shoot both guns is always a help in ruling out problems. Find someone to go with you. If both guns shoot close to the same for other people then you know where the problem lies.
If you're interested in gauging how much you are flinching, get some .45ACP snap caps or dummy rounds and load them randomly (or have someone else do it) in your mags among live rounds. When the dummy comes up you'll see exactly how much of a nose dive the gun takes when you pull the trigger.
First thing I would do is measure the heights of your front and rear sights. They may not necessarily be the same but you'd expect to see a similar ratio front to rear. If the Colt has an excessively tall front sight obviously you'll shoot low with it.
Second thing is to swap the grips and shoot each gun again and see how you group. That big fat Hogue rubber grip is going to position your hand completely different than when your shooting the S&W. Switch them around and see if the problem follows the grips.
As far as the weight and the barrel length, you can't change that, but the lighter/shorter gun will be more susceptible to any flinching you're doing in anticipation of the recoil. Certainly, the looser, lower grouping is suggestive of a flinch. As suggested, shooting the gun off sandbags or some other rest will keep it stable. Also, I'd shoot the Colt first each range session, while your fresh and less likely to flinch, and see what kind of groups you get.
Of course, having someone else shoot both guns is always a help in ruling out problems. Find someone to go with you. If both guns shoot close to the same for other people then you know where the problem lies.
If you're interested in gauging how much you are flinching, get some .45ACP snap caps or dummy rounds and load them randomly (or have someone else do it) in your mags among live rounds. When the dummy comes up you'll see exactly how much of a nose dive the gun takes when you pull the trigger.
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