by Tom Gaylord
Writing as B.B. Pelletier
IZH MP532 single stroke target rifle.
by Tom Gaylord
Writing as B.B. Pelletier
This report covers:
- Blog will change
- Bedding problem
- Channel widened
- Action now fits
- Did that change the point of impact?
- What’s next?
- What now?
- How did it do?
Blog will change
I have been asked not to schedule a blog for Monday because the blog is about to be updated. So we will be out of touch for a while. Don’t worry, I’ll still be here and I’ll get back just as soon as they give me the go-ahead. Now, let’s get to today’s report.
Today I attempt to correct the sight adjustment problem on my older IZH 32 target rifle. When the rear sight is adjusted as high as it will go the rifle still shoots a couple inches low.
This rifle wasn’t bedded properly by the factory. The action and barrel stood proud of the stock channel in front.
The older MP 532 rifle action and barrel stood proud of the forearm. If that was corrected would the rifle shoot to the aim point?
I didn’t want to address this problem myself because I am a wood butcher. So I consulted with my neighbor, Denny and he agreed to look at it. I knew once he did he would take ownership, which he did. He knows my woodworking skills even better than you.
We tried swapping the old action into the new stock, but that solved nothing. So Denny felt the best approach was to rout out the barrel channel. He did it freehand, but made a pair of blocks for the router to ride on.
Step one was to cut two 9-inch oak blocks. The sparkles in the picture are sawdust in the air.
We discovered that the sides of the forearm are cut on a 7-degree angle. So the sides of the guide blocks had to be cut the same.
Denny determines the angle of the side of the 532 forearm.
Denny sets the saw blade to shave off 7 degrees from the side of each block.
The router was freehanded along the blocks Denny made.
I thought the stock channel wasn’t deep enough, but Denny knew that the problem was width. The stock channel was not wide enough for the forward end of the barreled action to fit into. Denny took a tiny bit of depth in his cut, but he mostly widened the channel in the stock. It was too narrow on the right and left side of the barrel channel at different places.
We had to set up the job four times to widen the channel by a few fractions of an inch on both sides. After each router pass we tried the barreled action in the stock. It wasn’t until the final try that the action dropped in the channel like it’s supposed to.
The end of the forearm has been widened sufficiently to accept the barreled action. The clearance on both sides is now about 0.010-inches, give or take.
Action now fits
After the fourth try the 532 barreled action dropped into the stock with a click and fit like it should. Success!
The old 532 now fits in its stock just like the newer one.
Did that change the point of impact?
I had fired 5 shots at 10 meters early in the morning before any work was done to the stock. Now that the stock was finished I fired five more shots with the same H&N Finale Match Heavy pellets and no sight changes. The pellets enlarged the hole, but there is still just a single hole at 10 meters. So bedding the action did not change where the rifle shoots. Many readers may now lord it over me!
The second five shots that were fired after the action was bedded enlarged the hole but went to the same place as the first five shots, before the action was bedded. The aim point was to top bull, so at 10 meters the shots are landing low!
I knew I could shift the clear front aperture a little inside the front globe, so that’s what I did. By moving the aperture down and to the left I moved the POI up and to the right. It didn’t move far enough in either direction, plus I didn’t want to do it this way. It was just an experiment. I shot at the same target as before, so we could see what happened.
I was surprised at this point. Apparently the Russians, who know how to make guns, made this one with a rear sight that doesn’t adjust into the range needed for target work — on a target rifle. That’s like a car without a starter motor!
The best thing at this point was for me to drill a new hole for the rear aperture at the top of the post and remount the rear aperture. One or more readers had suggested this when I told you about the problem, and it has always been in my mind if bedding the action didn’t work. Clearly it didn’t, so it was time to make the fix.
I moved the rear aperture as high as it will go in its post.
How did it do?
The big question is, did moving the rear aperture up help? I put up a new target, because the POI may have changed dramatically. As it turns out, it did, and I did the right thing. I aimed at the bottom bullseye and the first shot hit 4-1/2-inches higher. It was almost off the paper and would have missed completely if I’d shot at the previous target. The question now was — could I adjust it down far enough to get on target?
I cranked in a LOT of down and a few clicks to the right and shot at the bottom bull a second time. The pellet hit at the edge of the bull I aimed at. So I put in three clicks of right adjustment and shot again. The hole grew no larger. I decided to finish the group without adjusting the sight any more. Five pellets went in to 0.10-inches at 10 meters — the smallest group this rifle has shot to date.
It turns out that the rear sight moves the point of impact very little per click. It took me six more shots to center the pellet.
Following that I shot one last group, just to prove the rifle was on. This one wasn’t as great, with five shots in 0.231-inches at 10 meters. But it had been a long day getting to this point, and I was looking forward to the photography and the writeup.
Well, we have certainly seen a lot about the IZH 532 target rifle. And today we culminated our look by fixing the sights on one of the two rifles. The other rifle doesn’t need it, so I now own two fine Russian target air rifles. I’m looking to part with one because how many Russian target air rifles does a guy need!