IZH MP532 target rifle: Part 3
by Tom Gaylord
Writing as B.B. Pelletier
IZH MP532 single stroke target rifle.
This report covers:
- BIG discovery
- The test
- Sight-in with RWS Meisterkugeln
- H&N Match Green
- Qiang Yuan Training pellets
- Trigger has great control
- RWS R10 Match Pistol
- Where are the good groups?
- H&N Finale Match Rifle
- RWS Hobby
- Still unaware
- The second rifle
- First shot — ah HA!
- Finale Match Heavy
- Qiang Yuan Training pellets
- Rear sight
Settle in, kids, because today holds a huge discovery. Today I shoot the two IZH MP532 rifles for accuracy.
I shot off a rest at 10 meters. Since a single stroke pneumatic doesn’t recoil, the gun can be rested directly on the bag. I shot 5 shots at each target so I could test more pellets, and there were also two rifles to test. I began the test with the latest rifle that was made in 2007.
I started the test by pumping the lever 3/4 of the way 20 times to flex and warm up the pump cup. Then on every shot I pumped 3/4 of the way, relaxed and then pumped all the way. We learned in Part 2 that this makes the rifle shoot as fast as it can and also keeps the velocity stable.
Sight-in with RWS Meisterkugeln
The first pellet I tested was the RWS Meisterkugeln Rifle wadcutter. And the first job was to sight the rifle in. Where would the first pellet land? Imagine my surprise to see that it struck the bull near the center. Okay, sight-in is over and that was shot number one of the first group. Four shots later there were five pellet holes that measure 0.299-inches between centers. Notice that this is a somewhat vertical group.
H&N Match Green
Next up were 5 H&N Match Green target pellets. They went into a 0.39-inch group that is also vertical. I will discuss that in a while, but notice that 4 pellets are in a small hole on the bottom, with one pellet higher and apart from the rest. I will have something to say about that later and it goes with the vertical groups.
Qiang Yuan Training pellets
Next I tried some Qiang Yuan Training pellets. They made a round-ish group that measures 0.24-inches between centers. This is the first group that wasn’t vertical and I wondered why.
Trigger has great control
I was now in a position to better evaluate the trigger and it is wonderful. I feel stage two every time and it breaks like a glass rod. At 13 ounces it’s heavy for a 10 meter rifle trigger, but it’s so predictable that it works.
RWS R10 Match Pistol
Next to be tried were the RWS R10 Match Pistol pellets. Five of them went into a nice round 0.265-inch group at 10 meters. But they are just as low on the bull as the heavier pellets, so I decided to adjust the rear sight up. It moved one click and then stopped. I couldn’t get the knob to rotate more. I wondered what the problem was and I will get to it in a bit. It has to do with those vertical groups, too.
Where are the good groups?
These groups may look small to some of you, and for a sporting air rifle they are, but they are large for a 10 meter target rifle. A Daisy 853 will shoot smaller groups than this! Don’t worry, though. I discovered the reason and it’s coming up soon.
H&N Finale Match Rifle
The next pellet I tried was the H&N Finale Match Heavy wadcutter. Five of them went into 0.149-inches at 10 meters. That is a decent group and it’s also the best one with this particular rifle, but I think it’s not the best the rifle can do.
The last pellet I tried in this rifle was the unbiquitous RWS Hobby. I hadn’t quite discovered that big thing I told you about yet, but I was getting close, so I shot these Hobbys better because I shot them differently. And they grouped better for me. Five went into a nice round 0.175-inches at 10 meters. That’s trime territory!
At this point in the test I knew something was wrong but I didn’t know what. I knew I couldn’t adjust the rear peep any higher by hand, so all the groups had to be low. That was a big clue, but I hadn’t caught on just yet. It was time to shoot the second rifle.
The second rifle
The second rifle was produced in 1997, making it 10 years older than the first rifle. I used the same warmup procedure (20 partial pumps to warm the pump cup) and a partial stroke before every pump stroke for each shot.
This rifle has a clear plastic aperture insert for the front sight, and I selected one that was only ever-so-slightly larger than the bullseye. It was very difficult to work with. If I shoot the rifle again I will swap it for an insert with a larger hole.
I decided to shoot only the three best pellets from the first rifle, which were H&N Finale Match Heavys, Hobbys and Qiang Yuans. However, things never got that far.
First shot — ah HA!
The first shot with H&N Finale Match Heavys hit the target about 6 inches below the aim point. So I dialed in a lot of elevation into the peep and shot again. The sight adjusted up easily. Shot two was still below the target, so I cranked in a bunch more elevation — AND RAN OUT OF ADJUSTMENT! The adjustment knob suddenly stopped. It felt just like the one on rifle number one. OH! The rear sight on rifle number one was adjusted as high as it will go and the rifle is still shooting too low! I’m learning.
Finale Match Heavy
Five Finale Match Heavy pellets hit the target about 1-1/2-inches below the aim point. They landed in an extremely vertical group that measures 0.429-inches between centers. I was almost certain the rifle was not responsible for the size of the group, and I also knew it wasn’t me. I thought it was the rear sight.
And then it happened. Everything became crystal clear and I know the problem.
Qiang Yuan Training pellets
I then shot 5 Qiang Yuan Training pellets into another vertical group. Two shots are above three shots, with each “group” being small enough to hold a pellet by the tail. But 5 shots are in 0.445-inches. The only way this can happen is if the rear sight was moved while I shot. So I pushed on it and, sure enough, it moved. THAT WAS THE PROBLEM!
I had been creeping up on the rear peep, trying to get my eye as close as possible to the peephole, but in Part 2 the first rifle’s buttstock was adjusted so long that it was very difficult to get close to that sight. Sometimes I did and other times I didn’t. The butt on rifle two wasn’t adjusted, so I got close to the peep every time. If my glasses touched the peep hole disk they pushed it forward, moving the location of the hole and changing the impact point up or down.
No sense going any farther with today’s testing. I need to find out some things about the sights and what can be done to correct the situation.
I’m going to write a report about that rear sight because I have just discovered a lot about it — stuff I haven’t told you yet. First, the two rifles have different rear sights! And the differences are big and they matter! Next, how you sight the rifle makes all the difference in the world. With the first rifle, when I didn’t push my face forward, the sight remained upright and my groups were smaller. When I pushed my face forward I hit the sight and it folded forward and down. Now that I know that, I am sure I can shoot better groups.
I know the MP532 isn’t an air rifle many of you will ever even see, but there are some fundamental principles at work that apply to all airguns. So this stuff is worth learning.
I had no idea this report would take the direction it has. From the shooting I did I can tell the MP-532 is about as accurate as an AirForce Edge or a Crosman Challenger PCP. It’s a worthy design that’s based on a single stroke pistol whose reputation is well-known to many of us.
We will press on and make this rifle perform to its capability before this is over. Stay tuned!
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