by Tom Gaylord, a.k.a. B.B. Pelletier
Diana 72 is a youth target rifle from the late 20th century.
This report addresses:
• More on the trigger.
• Accuracy with various pellets.
• Why 5 shots?
• Accuracy with deep-seated pellets.
Today is accuracy day for the Diana model 72 target rifle. We had one extra report in this series, and that was on adjusting the trigger. I want to tell you some more of what I have learned about this trigger.
More on the trigger
During the accuracy test, the trigger failed to work two times. The first time I made a small adjustment and got it running again in a matter of a minute. The second time, however, I worked on it for 15 minutes without success. I finally read Part 3 of this report, to see where the two adjustment screws had been positioned when the trigger was working. The camera angle of that photo isn’t the best, so there was still some guesswork involved; but even then I couldn’t get the rifle to fire.
Then, I thought of something. I know this rifle has a very protective anti-beartrap mechanism, and I wonderd if it was a little too over-protective. So, I cocked the gun, again (it was still cocked and loaded from when the trigger had failed). I’ve had other spring-piston air rifles — most notably Weihrauchs and a few Dianas — that would seem to cock but wouldn’t quite go all the way. How many people have I talked through cocking their RWS Diana sidelevers because they had not pulled the lever all the way back, and the gun was stuck? Even my Whiscombe has done this often enough that I’m used to it.
When it happens to the 72, the rifle is cocked from the standpoint that the piston is back and the mainspring is compressed, but it also isn’t fully cocked in that the trigger isn’t in the right position to fire the gun. It’s a sort of limbo state that some spring rifles can get into. Think of it as a disagreement between the trigger and the anti-beartrap device, and the designers have allowed the anti-beartrap device to trump the trigger for safety reasons.
All you need to do when this happens is cock the rifle a second time, making sure that the cocking linkage goes all the way back. When I did this, the 72’s trigger began working immediately. So, if you ever get one of these rifles, keep this in mind.
I began this test not knowing where the sights were set. After all, this rifle had been through a complete rebuild, so those sights presumably came off. And the action has been out of the stock several times over the past 2 years. So, the gun needed to be sighted-in.
As a side note, the manufacturing date on the left rear of the spring tube is November 1989. That puts it near the end of the production cycle (1979-1993, according to the Blue Book of Airguns).
Sighting-in with H&N Finale Match Pistol
I started sighting-in with H&N Finale Match Pistol pellets. The first shot was lined up with the center of the bull, but it was too low. It landed at 6 o’clock. Since the sights are target apertures front and rear, I was not using a 6 o’clock hold, but centering the bull in the front aperture.
The first sight-in shot was interesting, but the second was even more so, for it would tell me if this was an accurate rifle or not. It hit above the first shot, in the same line but the 2 holes didn’t quite touch. That was good but not what I had hoped for. I had hoped to see a single hole that had barely enlarged with the second round.
Shot 3, however, went into the same hole as shot 2, and shot 4 joined them. So, the rifle was probably accurate, after all. I clicked the elevation up two clicks and proceeded to the first record target.
Shooting for the record
The first 5 shots went into a group that measures 0.221 inches between centers. It’s a group you would love to see out of most sporting rifles but not impressive coming from a 10-meter rifle. Just to make sure it wasn’t me, I shot a second group with this same Finale Match Pistol pellet. As I shot, I could hear the voices of the newer readers, asking why I only shot 5 shots. So, on just this one target, I put 10 into the next group, which measures 0.269 inches. That’s encouragingly close to what just 5 shots did, so it renewed my enthusiasm.
Five H&N Finale Match pellets went into 0.221 inches at 10 meters.
Ten H&N Match Targets made this 0.269-inch group. This is not that much larger than the 5-shot group.
RWS R10 Match Pistol pellet
Next up was the RWS R10 Match Pistol pellet. Five of those made a group that measures 0.244 inches. It’s in the same range as the H&N Finale Match pellet, so no cigar.
Five RWS R10 Match Pistol pellets went into 0.244 inches.
After that, I decided to give the RWS Hobby wadcutter pellet a try. Who knows what they might do? Well, that was a good decision this time, because 5 of them went into 0.194 inches between centers — the smallest group so far.
Five RWS Hobby pellets went into 0.194 inches at 10 meters. This is a good group.
At this point, I’d noticed that all the groups were landing off to the left. There’s no scope involved, so I can hit the center of the target and not destroy the aim point. I dialed in 3 clicks of right adjustment into the rear sight and continued the test.