Kral Puncher Breaker Silent Synthetic .177 PCP repeater: Part 2
by Tom Gaylord
Writing as B.B. Pelletier
This report covers:
- Magazines are easier to load
- Crosman Premier Lights — low power
- Crosman Premier Lights — medium power
- Crosman Premier Lights — high power
- High velocity
- Max power
- Trigger pull
Today we test the velocity of the Kral Puncher Breaker Silent Synthetic bullpup rifle. Let’s begin.
Magazines are easier to load
I found the two magazines that came with this rifle MUCH easier to load and manage than the mags I tested with the.22 caliber Kral Puncher Pro rifle last year. That one gave me numerous failures to feed in the velocity test. This one was perfect! And, when I say one, I mean that I tested both mags. It also loads easier, because I think the spring in the mag may be lighter. At least that’s how it feels.
Crosman Premier Lights — low power
I used the Crosman Premier Light pellet, to test the range of power adjustments. I started with 10 pellets at the lowest setting. They averaged 356 f.p.s., which is very slow. The low was 349 and the high was 365 f.p.s. — a spread of 16 f.p.s. That’s pretty tight for the absolute lowest power setting.
At the average velocity on low this pellet and setting gave me 2.22 foot-pounds at the muzzle. The discharge sound was extremely quiet. No neighbor farther than 25 feet will even notice it.
Crosman Premier Lights — medium power
Next I dialed the power knob to the mid point. At that setting 10 Premier Lights averaged 778 f.p.s., with a low of 771 and a high of 784 f.p.s. That’s a spread of only 13 f.p.s.
At the average velocity this pellet and setting gave 10.62 foot-pounds of energy at the muzzle. The discharge sound was high — almost a solid 4 on Pyramyd Air’s 5-point scale. You should not shoot this in your back yard if you have sensitive neighbors. At this power level the Puncher Breaker Silent Synthetic lost its silent rating.
Crosman Premier Lights — high power
The power knob was dialed up as far as it would go. At that setting the rifle averaged 1086 f.p.s. with the Premier Light pellet. The low was 1072 and the high was 1094 — a spread of 18 f.p.s. The rifle is still consistent at this power setting.
At this velocity the Premier Light pellet generates 20.69 foot pounds of energy at the muzzle. The discharge noise is in the high 4s — a rifle that will draw attention from 100 yards. There are louder smallbore PCPs, but this one is loud. It’s completely different from my experience with the Puncher Pro rifle in that respect.
Looking at the power settings and their velocities I know there are a lot of other settings that will give you exactly the velocity you want with this pellet between the absolute low and high. If it were my rifle I’d find the best pellet and velocity and leave it set there. But there is more to see today.
At this point in the test the onboard gauge still indicates 160 bar of air pressure in the reservoir. I began the test with 200 bar in the gun. I have fired a total of 35 shots at varying power levels so far.
The action is not stiff like the Puncher Pro I tested last year, but there is resistance to the cocking lever as the bolt is pushed forward to seat the pellet. I thought it was the magazines, but when I tested the rifle with no magazine installed, I felt the same resistance. It’s something to get used to, I think.
Also, because this is a bullpup, the cocking lever is back by the buttpad. That puts it at your shoulder. It’s not convenient to cock when it’s resting on your shoulder, but I will look closer at that in the accuracy test that comes next.
Okay, what’s the mostest-fastest velocity we can get from this Puncher Breaker? I’ll use a synthetic pellet and it’s going to break the sound barrier which will add to the discharge noise, so I’m only shooting five shots.
I selected Sig Match Ballistic Alloy pellets for this test. They weigh 5.25-grains and should give really high velocities.
Five Sig Match pellets averaged 1191 f.p.s. The spread was a tight 3 f.p.s. — from 1190 to 1193 f.p.s. They definitely did break the sound barrier but my tuxedo cat, Punky, slept through all of it in my office. I even warned him before I started but he just looked at me with one eye open and then curled back up. I thought the shots were very loud, but Punky obviously didn’t agree.
At the average velocity this pellet generates 16.54 foot-pounds of energy at the muzzle. It’s demonstrating that light pellets are less efficient in PCPs.
Now that we know the velocity, what is the highest power the Puncher Breaker Silent Synthetic can produce? I didn’t use the absolute heaviest pellets possible, but chose a standard heavyweight that most shooters might use in a rifle like this — the H&N Baracuda Match pellet. This 10.65-grain pellet averaged 979 f.p.s. on high power. The spread was 8 f.p.s. — from 976 to 984 f.p.s. and the energy produced at the average speed was 22.67 foot pounds at the muzzle. The heaviest pellet you can find might bump that up another 1-2 foot pounds.
At this point there are 45 shots on the fill — and 20 of them were at full power. The manometer now reads 150 bar (2176 psi). Like the Puncher Pro, this rifle seems to manage air well.
I loaded another magazine of 14 Premier Lights and shot them next. The rifle is still on high power. The first shot went out at 1161 f.p.s., which is 25 f.p.s. slower than the maximum average velocity with this same pellet. The 14th shot went out at 987 f.p.s and the average for this string was 1024 f.p.s. Clearly the rifle has dropped off the power curve. You can still shoot for awhile, and if you are shooting at lower power it should be possible to increase the power setting at this point to keep the velocity the same. That takes a lot of experimentation with one specific rifle and pellet. I had a Career 707 I got to know very well and could get 90 shots at 30 foot pounds if I kept dialing the power up as the number of shots increased.
The rifle’s gauge reads 130 bar (1885 psi) at the end of this string. I refilled the tank and noted that the actual pressure inside was 2,000 psi on my tank gauge that is fairly accurate, so now I know where the onboard rifle gauge reads. It’s only off by 100 psi, which is pretty accurate. The needle is still in the green at this pressure, but the rifle is definitely off the power curve.
The two-stage trigger is reasonable, if not light. There is some movement in stage two, but I wouldn’t call it creep. It’s smooth right to the letoff, which comes at 4 lbs. 5 oz. I can live with that.
I start testing accuracy next. I am already looking at this little rifle fondly for its light weight and compact size. If it turns out to be extremely accurate, Pyramyd Air may not get it back!