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Thread: Ps90 Accuracy

  1. #11
    Senior Member ShipWreck's Avatar
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    Yes, I think the trigger is what affects pin point accuracy. But 1/2" groups at 50 yards is good enough for me


  2. #12
    Senior Member SunsetSam's Avatar
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    Ship, is 1/2 inch at 50 yards your average group? That is a 3 shot group, right? How are you resting the weapon? Which ammo are you using? I'd be thrilled if I was grouping 1/2 inch.
    You can't take the sky from me.

  3. #13
    Senior Member ShipWreck's Avatar
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    So far I have only put 160 rounds thru the gun. The last 60 was at an indoor range because I wanted to sight the laser in at a home defense distance.

    So, the first 100 was put thru it at the 50 yard range. 50 of that was sighting in the eotech.

    I had planned to go shoot 100 more thru the gun this past weekend at the outdoor range, but the weather didn't cooperate. I found it very boring to shoot a rifle at a 15 yard indoor range.

    Anyway, yes, it was a 3 shot group. Two of them actually. As I was trying to fine tune the eotech and figure out if it was me pulling the gun or the eotech that needed final adjustment, I got two 3" groups.

    I had the gun resting on 2 sandbags on the fron, and 1 sandbag for the rear of the stock. I adjusted the front ones until it got the gun where I wanted.

    I was using the 197 ammo - all I can buy locally, and the only ammo I have tried so far.

    I do not have any strap or anything else attached to the barrel.

    The gun is really kewl. When sighting in the laser, I had a sandbag on each end. I stood above the carbine and just put my finger on the trigger to fire it. I wanted to have as little movement to the gun as possible. I fired it a few times this way as I made adjustments in between shots to the laser. The recoil is so mild that the gun never moved on the sandbags.

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  5. #14
    Senior Member metroplex's Avatar
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    I have found most weapons shoot very tight groups for the first 3 shots. My Vepr will shoot 1"-1.5" 3-shot groups at 50 yd using Barnaul JHP (7.62x39).

    I found the PS90 does the same thing, but the groups start to open up when you go for a 10-15 shot group to measure the consistency of the precision. I have found the stock trigger pull to slow down my familiarization with the weapon, and the stock reflex sight to be equally as bad.

  6. #15
    Senior Member ShipWreck's Avatar
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    Well, I didn't get a chance to get or check all my targets once more people showed up on the range.

    Most pistols are checked for accuracy in 3 or 5 shot groups. 10-15 shot groups start depending on the shooter, not necessarily the gun. U start moving the gun when you U pull the trigger and what not. Unless its straped into a vise or rest, U get variation that may not be the gun's fault. Granted - that is more of a real world showing because it shows how U use the gun over many shots.

    Anyway - my only point was to show the people who complain about huge groups that the gun is fairly capable. The heavier trigger can get groups to open up a bit. But w/ a better sight than the stock one, U can shoot very accurately. I am more than satisfied.

  7. #16
    Senior Member SunsetSam's Avatar
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    Ship, if you feel like it, sometime when you go to the range try several 5-10 shot groups at 50 yards and average them all.

    My 2 inch 50 yard 5 shot average was determined from about forty 5 shot groupings, so I had a lot of data. This included sighting in the ACOG. I didn't throw out the first few groups because they didn't tighten up that much as I continued to shoot.

    I shot 5 shot groups because I kept seeing the title of this one thread on AR-15.com that read "The Trouble With 3-Shot Groups". I finally read some of that thread today. Here is a link:

    http://www.ar15.com/forums/topic.htm...f=118&t=279218

    It makes sense to me that the more shots in your group the more accurate your data will be.

    Hopefully I can get to the range this weekend. I want to get a couple of notched sandbags to rest the rifle better. I put some powdered graphite on the trigger bar and trigger group too.

    Right now the rifle is shooting minute of 1/2 pound Tannerite bottle, so that is alright for me
    You can't take the sky from me.

  8. #17
    Senior Member ShipWreck's Avatar
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    well, next time I go, I will see. I was supposed to go last weekend, but the weather didn't work out

  9. #18
    Senior Member SunsetSam's Avatar
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    Took another trip to the range today. The temp was about 60 degrees and there was about a 10mph crosswind.

    In an effort to tighten up the groups I got a set of notched sandbags from WalMart and I lubed up the transfer bar and hammer group with some Balkamp dry powdered graphite lubricant I got from Napa auto parts. During the first real range session I only had one sandbag up front. That was a sandbag the range had provided that was just a small bag filled with sand. With the two notched bags things were much steadier. The graphite did make the trigger smoother, but it is still a loooong trigger pull. The pull didn't seem quite as heavy as before.

    Note: Cover your sight before applying the dry graphite lube and be careful. This stuff can go everywhere. It is just about as bad as cat hair

    I also made the targets easier to see. The targets provided by the range consist of a series of ten small human silhouettes with a hard to see center. I gave myself a good center by adding 3/4 inch red stick on dots.

    The average of twentyseven 50 yard 5 shot groups with no called fliers was 1 3/4 inches. Apparently I shoot like I bowl because the first 10 groups averaged 1 1/2 inches.

    I still think I can do better. I think I need to be more consistant with my cheek weld and sight picture. I'm not a marksman by any means. Until getting the PS90 I probably hadn't touched a rifle in a couple of decades. I mostly shoot handguns and don't do enough of that.

    I'm satisfied with the accuracy so far. Considering what it was originally designed for I think mine is shooting well.

    I think the best thing you can do to accurize the PS90 is to first replace the standard Ring Sight. Lightening the trigger pull would probably help, but I don't want to mess with the trigger yet other than applying the graphite lube.

    For someone considering a PS90 I would recommend getting one of the new tri-rail versions and an Eotech or red dot sight. The Eotech would give the advantage of the 1 MOA dot for precision shooting and the ability to aim to the bottom of the circle of the reticle for close range shooting. That would compensate for shooting low at close range due to the distance from reticle to the centerline of the barrel. I like my 2x20 ACOG, but it may be overkill for the PS90 and is very expensive at $800. I do like the magnification though.
    You can't take the sky from me.

  10. #19
    Senior Member Tomac's Avatar
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    I've only group-tested my PS90's once and that was with the original ringsight at 50yds using SS197 while sighting in. The Shoot-N-See bullseye I was using exactly fit the outer ring of the ringsight's reticle making precision shots easy. I was getting multiple 3-shot groups of .5"-.75". Since this is a CQB carbine this level of accuracy is more than sufficient for my needs. I now have TriPowers on my PS90's and while the inverted chevron reticle is better suited for CQB snapshots than precision aiming I can still consistently hit the 200m & 300m gongs using SS197.
    Tomac

  11. #20
    Senior Member SunsetSam's Avatar
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    Thanks Tomac. Try shooting more groups and report the results.

    I haven't shot SS197 yet. I wonder if it is more accurate than SS195LF.

    I want to try some different targets next time. The crosshair on my ACOG was exactly the same thickness as the 3/4 inch dots I was shooting at 50 yards. That may account for some of the vertical stringing I was getting. Since the dots were on silhouettes I didn't have a concentric circle to center on.

    The reason I'm shooting so many groups is to teach me how to shoot and try to get some consistancy. I think my groups are ok, but most of them are not centered on the dot. I want to figure out why I'm putting the groups in different places.

    I want to shoot some more 50 yard 10 shot groups too. I did two 10 shot groups and one 13 shot group this last time out. One of the the 10 shot groups was 1 3/4 inches and the other two groups were 2 1/4 inches.

    Ship, how about a sticky accuracy thread? I think we have 3 different accuracy threads going on now.
    You can't take the sky from me.

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