by Tom Gaylord
Writing as B.B. Pelletier

Galahad
Air Arms Galahad PCP in walnut is a striking looking air rifle!

Part 1
Part 2

This report covers:

  • What we know
  • What I want to see
  • First string
  • Second string
  • Third string
  • Fourth string
  • Fifth string
  • Sixth string
  • Seventh string
  • Analysis
  • Out of time

Today I continue testing the velocity of the Galahad rifle from Air Arms. I told you in Part 1 that this rifle is complex and will require a lot of testing before moving on. Not only does it have a 5-position power adjuster, it also has a regulator, that adds an additional level of complexity.

What we know

In Part 2 we learned where the power bands are at each power setting. For example, we saw that the lowest power setting is virtually unusable, giving velocities with .22-caliber Crosman Premier pellets below 300 f.p.s. Power settings 2 through 5 are quite useful though. I find power setting 3 (Premiers average 749 f.p.s.) to be idea for general work outdoors and setting 2 (Premiers average 539 f.p.s.) is ideal for indoors. At those settings the spread of velocities was 14 f.p.s. and 15 f.p.s., respectively. That’s where the regulator comes into play.

What I want to see

You may not appreciate that a regulator isn’t designed for a gun with a power adjuster. The power adjuster works better on a gun that has no regulator, because the reg is balanced against a certain volume of air in the firing chamber. The power adjuster also has a firing chamber, but there is no regulator in the way, so some air still flows freely from the reservoir and that is how unregulated PCPs balance their power. For that reason, unregulated guns do better than regulated guns when there are power adjusters. Tell me if that still confuses you and I might write a blog about it.

So here is the test. I will fill the rifle and shoot on power setting 3. I will see how many strings of 10 shots I can get before the regulator quits. We’ll know when it happens because the velocities will drop fast after that.

First string

The first string averaged 762 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….767
2…………….765
3…………….770
4…………….769
5…………….761
6…………….758
7…………….759
8…………….752
9…………….760
10……..…….758

The low was 752 f.p.s. and the high was 770 f.p.s. The extreme spread was 18 f.p.s. At this point this doesn’t mean much, but watch what happens as I continue to shoot.

Second string

The second string averaged 766 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….779
2…………….774
3…………….770
4…………….765
5…………….766
6…………….760
7…………….753
8…………….752
9…………….778
10……..…….766

The low was 752 f.p.s. and the high was 779 f.p.s. The extreme spread was 27 f.p.s. Now you are seeing how the rifle performs. This second string was the most variable one in the test. Also, after firing string 2 the rifle was sitting at around 3000 psi, so for those who don’t have a means of filling to 250 bar, the rest of this test is what the rifle can do on a fill to 3000 psi or 206 bar.

Third string

The third string averaged 756 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….774
2…………….759
3…………….759
4…………….753
5…………….756
6…………….750
7…………….755
8…………….750
9…………….750
10……..…….756

In this string the low was 750 f.p.s. and the high was 774 f.p.s. That’s a 24 f.p.s. spread.

Fourth string

The fourth string averaged 753 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….763
2…………….756
3…………….752
4…………….764
5…………….746
6…………….751
7…………….752
8…………….750
9…………….747
10……..…….748

In string four the low was 746 f.p.s. and the high was 763 f.p.s. That’s a spread of 17 f.p.s. See how the velocity spread gets tighter as the reservoir pressure drops?

Fifth string

The fifth string averaged 752 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….764
2…………….757
3…………….752
4…………….748
5…………….749
6…………….748
7…………….749
8…………….754
9…………….750
10……..…….746

In string number five the low was 746 f.p.s. and the high was 764 f.p.s. The spread was 18 f.p.s.

Sixth string

The sixth string averaged 749 f.p.s. for 10 shots. Let’s look at it now.

Shot……….Velocity
1…………….750
2…………….750
3…………….749
4…………….745
5…………….746
6…………….751
7…………….749
8…………….751
9…………….753
10……..…….749

In string 6 the low was 745 f.p.s. and the high was 753 f.p.s. That’s a spread of just 8 f.p.s. My instincts told me this was very close to the last string on this fill, but I pressed on just the same.

Seventh string

The seventh string averaged 638 f.p.s. for 10 shots. Yes, we have fallen off the power band because the regulator is no longer working, due to the reservoir pressure being too low. Let’s look at it now.

Shot……….Velocity
1…………….755
2…………….750
3…………….755
4…………….742
5…………….740
6…………….no shot fired
7…………….190 (must have been a double feed from the shot before)
8…………….561
9…………….605
10……..…….642

Can you see how fast the velocity changed on shot 6? That’s what it looks like when you fall off the reg. I’ve never tested a regulated gun that also had adjustable power before and I suppose other similar guns might perform somewhat different, but all of them fall off the reg in pretty much the same way, which is to say dramatically.

Analysis

First I want to note that I got 65 good shots on power setting three! Across all 65 shots the low was 740 f.p.s. and the high was 779 f.p.s. — a spread of 39 f.p.s. Since I’ve not tested a gun like the Galahad before I have no frame of reference, but WOW! That’s an impressive number of good powerful shots on a single fill. At the end of the test the onboard pressure gauge is reading 110-115 bar (1,595 psi to 1,668 psi).

You shooters with 3000 psi air tanks have to subtract 20 shots from the maximum shown here. You get 45 good shots per fill on power setting 3, when shooting the Crosman Premier pellet. That’s still impressive! Compare that to unregulated PCPs and I think you will agree.

Out of time

I thought I was going to wrap up the velocity test today, but once again I have run out of time. I still want to test the maximum power I can get, as well as how easily the rotary magazine handles longer (heavier) pellets. Because they are where the greatest power will lie.

The Galahad is an expensive airgun, and also one with some complexity because of both the regulator and adjustable power. I want to make certain I test it thoroughly.