Gunnar
Benjamin Gunnar.

Part 1
Part 2
Part 3
Part 4

This report covers:

  • Perfect day
  • The test
  • Crosman Premiers
  • Adjusted the scope
  • Second Premier group
  • Air Arms 18-grain dome
  • JSB Exact Jumbo Heavy
  • Refilled the reservoir
  • Second group of JSB Exact Jumbo Heavys
  • Summary

Today is the 50-yard accuracy test of the .22-caliber Benjamin Gunnar. The last report was way back in April. I had to read all the past reports to remind myself of how the rifle operated and I think if you want to make the best sense out of today’s report, you should too.

Perfect day

I was at my rifle range early in the morning and the day was perfect. There was not a hint of breeze and, at 69 degrees F, it was a cool morning. I couldn’t ask for better shooting conditions.

The test

I shot with the Gunnar rested on a sandbag. The rifle was resting directly on the bag. I shot 10-shot groups, which are easy, given the Gunnar’s 12-shot rotary magazine and the sidelever bolt. There were no failures to feed during the test and every pellet fed like mercury going through a seive.

To start off the rifle was filled to 3,000 psi and the power was set at the 2/3 mark (two clicks down from the top), which is where it was set at the end of the 25 yards test. Given the Gunnar’s accuracy at 25 yards I thought it prudent to start there.

If you don’t remember the Gunnar is scoped with an Aeon 8-32X50 scope with a sidewheel parallax adjustment. It was reasonably clear at 50 yards, but I’m afraid the clarity of the new Meopta scopes have spoiled me. And don’t forget that Leapers new premium line of Integrix scopes is coming out soon. I will test those for you as soon as I get them.

Crosman Premiers

The first group was made with Ten 14.3-grain Crosman Premiers. They did reasonably well in the 25-yard test (a 10-shot group there measured 0.505-inches) so I thought I’d try them at 50.

The first shot landed below the bullseye, and in line with the center. That was good, I thought, because the scope was still sighted for 25 yards. I finished the group and it looks horizontal to me, though I remind you there was zero wind. So that was a function of the Premier pellet in the Gunnar set to this power level.

Ten shots made a group that measures 1.329-inches between centers at 50 yards. It’s not what I would call a good group, but I wanted to give this pellet one more chance. Maybe it was me?

Gunnar Premier 50 yargs-1
At 50 yards the first ten Crosman Premiers landed in a group that measures 1.329-inches between centers.

Adjusted the scope

Through the scope it seemed that the center of the group was about one inch below the center of the bull that I aimed at. The Aeon scope has 1/4-minute clicks, so I adjusted it up 8 clicks, because a quarter minute of angle at 100 yards is about a quarter inch. At 50 yards it’s half that, so 8 clicks equals one inch.

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Second Premier group

Changing nothing else I shot the second group. It actually rose by an inch, so the scope’s adjustments are spot-on. This group was both horizontal and also a bit vertical. It measures 1.563-inches between centers. It’s close enough to the size of first group that I can say the Premier is not the best pellet for the Gunnar — especially past 25 yards.

Gunnar Premier 50 yards-2

The Gunnar didn’t do any better on the second group. Ten pellets made a 1.563-inch group at 50 yards.

Air Arms 18-grain dome

Next up were some 18-grain domes from Air Arms. These are made for Air Arms by JSB, but I have found them to perform differently than the JSB Exact Jumbo Heavy that weighs 18.13 grains. They are also often the most accurate pellet in a .22 rifle. But not this time. The first pellet hit the target paper 2-1/2 inches above where I aimed. Shot two went 1-1/2 inches to the right of that. Shot three went another 1-1/2 inches to the right of that and shot 4 dropped 3 inches below the previous shot and 4 inches to the right of the aim point. At that point I checked that was shooting .22-caliber pellets. I was, but in the Gunnar they just didn’t work. So I blew off the remaining 6 pellets (shot them into the ground).

JSB Exact Jumbo Heavy

In my test at 25 yards the JSB Exact Jumbo Heavy was the most accurate pellet of all. I’m not saying that it is the very best — just of the four pellets I tested. And at 10 meters I put 5 of these pellets into 0.051-inches, the best of all pellets in that test, too. Therefore I had confidence that this pellet would be the best at 50 yards.

On the first group the Gunnar put 10 JSBs into a horizontal group that measures 1.35-inches between centers. Remember, there was no wind. I looked at the onboard pressure gauge after this group and saw that it was right at or just above 2,000 psi. At the end of this group I had fired a total of 40 shots.

Gunnar JSB Jumbo Heavy 50 yards-1
With the Gunnar set to 2/3 power the JSB Exact Jumbo Heavy went into 1.35-inches between centers.

Refilled the reservoir

I refilled the rifle to 3,000 psi and dialed the power up to full. That is a JSB Exact Jumbo Heavy going out at 891 f.p.s. I wondered if it would make a difference.

Second group of JSB Exact Jumbo Heavys

This group went a little to the right of the previous group and became vertical instead of horizontal. Ten pellets landed in 1.068-inches between centers. It’s a little better than the last group and was the best I was to see on this day, for I had a second test to conduct.

0Gunnar JSB Jumbo Heavy 50 yards 2
On full power the Gunnar put 10 JSB Exact Jumbo Heavys into this 1.061-inch group at 50 yards.

Summary

Well that is my test. The Benjamin Gunnar is a nice precharged pneumatic air rifle that has a smooth sidelever and a regulated power for plenty of shots in the 30 foot-pound range in .22 caliber. The trigger is nice. I said in Part 2 that it’s not adjustable, but in fact it is.

The magazine does not stick up above the top of the receiver, so the scope can be as low as the outside of the scope and the mounts will allow. Besides the two magazines, tools and regulator, the rifle comes in a very nice hard case with a handle on one end and wheels on the other.

The Gunnar is a lot of airgun but the thousand-dollar price is also quite a lot. It’s in with some serious competition. And now you know what it has to offer.