Help, what is the problem?

[Norton]

I just got back from the indoor range and took the USP9f and the Ruger MkII out for a little exercise.

I'm a little perplexed by my performance as follows:

After a bit of warm-up with the .22lr at 25ft, I back the target up to 50ft. I've been alternating magazines between the 2 firearms with the logic that any quirks in my shooting will be magnified by the differences in caliber.

Results: I'm grouping very well with both guns at 50ft but the Ruger is grouping to the right of center and the HK is grouping to the left of center.......consistently. If I could put those groups into the center, I'd feel like I'm doing something. The target looks like I folded it down the center and shot 2 inches off of that cente line in a mirror image (except for the different size holes of course)

So....any armchair diagnosis? I know the HK shoots true as a friend took it out with my wife and nailed the 10 ring with 10 shots at 50ft (besides, it has fixed sites). The Ruger is a bit suspect as I had a new rear site put on it.....could be that it's just not sighted properly.

What would explain the big difference between the two?

 

[caz223]

I assume that one is shooting left, and the other is shooting right?

 

[Norton]

caz223

Thanks....that's what I get for typing too fast.

 

[PCRCCW]

Just speculation about the situation. It the trigger styles/differences are effecting you at all, they are consistant with your results. The SA trigger on the Ruger is a clean breaker......and the sight my be off as you mentioned. Going from the clean SA trigger to the DA trigger will, in most cases cause you to go left......if your right handed.

Instead of switching off each mag, try shooting one gun for a box of shells and then switching. This way you have enough trigger time with each gun that you get familiar with each one in that session.

Or I could be completely wrong............

Shoot well.

 

[Bullet Bob]

Just because a firearm shoots point of aim with one set of eyes and hands, that doesn't mean anything to a different shooter - You just need to drift your rear sights in the direction you want the groups to move.

 

[ARperson]

Just because a firearm shoots point of aim with one set of eyes and hands, that doesn't mean anything to a different shooter - You just need to drift your rear sights in the direction you want the groups to move.

A very important point.

My hubby's Colt AR is sighted for him, and when I shoot it, my groups are never as tight as his and I'm usually off to one side or the other. Conversely, compared to my "touching" groups, he can't hit the broad side of a barn with my Bushy AR.

I would suggest some benchrest shooting with them to eliminate as much shooter-induced wobble and error as possible. If you can get each firearm to group center with that method, then it's probably your shooting style.