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my px4 shoots low.


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Old 10-04-2013, 11:48 PM   #11
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Just a thought but check to see if you're pistol is still under warranty. I had a similar issue with my P226 they set the wrong front sight.I called Sig Sauer they paid for shipping replaced my front sight and had it back to me within a week.
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Old 10-06-2013, 12:59 PM   #12
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I just purchased a 45 cal. PX4 Storm. Tested accuracy with 50 rounds. Poor results compared to my 1911. Does anyone know a location of a sighting diagram? I read several confusing and somewhat contradictory verbiage to proper sighting. The manual directs user to have desired target area to sit on top of centered front sight. This may be my problem. I am dead on with my 1911 when centered front sight is directly over desired target area. Thanks
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Old 10-06-2013, 01:59 PM   #13
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Originally Posted by bsteve2 View Post
I just purchased a 45 cal. PX4 Storm. Tested accuracy with 50 rounds. Poor results compared to my 1911. Does anyone know a location of a sighting diagram? I read several confusing and somewhat contradictory verbiage to proper sighting. The manual directs user to have desired target area to sit on top of centered front sight. This may be my problem. I am dead on with my 1911 when centered front sight is directly over desired target area. Thanks
This Beretta, because of the rotary locking system, has a different recoil impulse. The more you get used to a 1911, the more effort it might take to adjust. As for the sights, I wouldn't bother with a diagram. Mount a sight-in target and slowfire from a vise or a heavy sandbag. It will take one loaded mag to know all there is to it.
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Old 10-06-2013, 02:51 PM   #14
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I have a PX4 in .40 and being a Marine, I also fire the M9 somewhat regularly. I've probably fired twenty different M9s over the years and I've just come to the conclusion that Berretas shoot lower than my other pistols if I use the same sight picture. My first day on the range for pistol is always me trying to get my groups up into the black. The PX4 is actually one of my favorite pistols, but if I don't shoot it often, I'll find myself low through about my first mag.
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Old 10-06-2013, 03:09 PM   #15
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It is true that you won't know until you try. But in a given handgun caliber a heavier bullet is often lower velocity, then it hits lower.
Not always at closer range. The arc of the bullets path is steeper for heavier bullets at lower velocity. At closer range the bullet is still climbing on the upward half if the arc. So if the target is closer the bullet would be passing through the paper at an earlier and lower portion of the arc before reaching the peak (apex) of the arc, farther down range.
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Old 10-06-2013, 03:14 PM   #16
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infidel,

I would contact *Beretta and advise them of you situation. I am sure it is not the first one that they have dealt with regarding this issue. As Sig advised things such as sights not in spec is possible.

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Old 10-06-2013, 03:45 PM   #17
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Not always at closer range. The arc of the bullets path is steeper for heavier bullets at lower velocity. At closer range the bullet is still climbing on the upward half if the arc. So if the target is closer the bullet would be passing through the paper at an earlier and lower portion of the arc before reaching the peak (apex) of the arc, farther down range.
So a heavier slower bullet may hit higher than a faster lighter bullet. Do you have an example of such difference and at what range?
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Old 10-06-2013, 09:53 PM   #18
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http://www.chuckhawks.com/handgun_trajectory_table.htm

Here is a link to a ballistics table. If you look down at the 9mm loads, you can see that the path at 25 yds puts the heavy bullets on a higher arc.

It holds true for most other calibers as well.

The chart doesn't go out far enough to show that those bullets also begin to drop pretty fast at long range but they hold velocity better due to momentum. In rifles this is part of the reason heavy bullets are used in ARs for long range shooting out to 600 yds and beyond, over using faster, lighter bullets.

It is why I specified the higher point of impact at shorter ranges with heavy or slower loads. The OP indicated he was shooting at a distance of 16.5 (but didn't specify, feet, yds, or meters).

When shooting service pistol matches I note that most of my loads in 9mm and .45 hit lower at 25 yds than at 50yds. That is because the bullet is still on its upward angle until after 50 yds.

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Old 10-06-2013, 10:16 PM   #19
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Originally Posted by SSGN_Doc View Post
Here is a link to a ballistics table. If you look down at the 9mm loads, you can see that the path at 25 yds puts the heavy bullets on a higher arc.

http://http://www.chuckhawks.com/handgun_trajectory_table.htm
I have compared the POI of 115gr @1200 fps to 158 gr @950 fps, both Fiocchi 9 mm out of a G17 at 15 yards. It was close enough but the subsonics hit lower. This is a consistent observation. The link did not work by the way, but I read Chuck Hawks and respect his opinions.
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Old 10-06-2013, 10:24 PM   #20
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Tried the link again and got the chart. A 0.2" difference at 25 yards. There could be many variables unaccounted for, I suppose.
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