Winchester M14 .177-caliber dual-ammo air rifle: Part 2
by B.B. Pelletier
Let’s test the velocity of the Winchester M14 dual-ammo rifle. Of course, I’ll test it with both BBs and lead pellets. This rifle is a semiautomatic 8-shot repeater powered by 2 CO2 cartridges. Someone made a comment that referred to the rifle having blowback action, but I want to clear that up — it doesn’t. Yes, the action operates by CO2 power and really is semiautomatic; but no — there’s no sensation of blowback, and nothing moves when the rifle fires.
You do have to pull the “bolt” back to cock the rifle before the first shot. It’s not really a bolt — just a plastic cover to hide the metal internal parts of the firing mechanism. But the act of pulling it back is realistic.
The stick mag has an 8-shot rotary clip on each end. After firing 8 shots, you pop it out and reverse it for another 8. Then, you must reload the magazine. I see no reason why you can’t carry additional loaded magazines, as long as you take some care to keep them clean. They do have moving parts that affect their function, so these parts have to be able to move or the gun will jam.
I tested the rifle with Daisy zinc-plated BBs first, and discovered that the rotary clips have a magnet inside to hold the BBs in place. Because the chambers in the clips are for .177 pellets, they’re too large for BBs — which are .173-caliber. But the magnets securely hold the BBs in place.
BBs averaged 560 f.p.s. and ranged from a low of 546 to a high of 580 f.p.s. That’s a pretty broad spread for a CO2 gun. It’s also 140 f.p.s. slower than the advertised top velocity of 700 f.p.s., which surprised me, because the BBs are very light and are possibly the fastest projectiles this gun can shoot. This BB weighs 5.1 grains and generates 3.55 foot-pounds of muzzle energy, on average.
The stick mag dropped out of position two times during the test, which entailed just over 40 shots. I’ll chalk that up to my not seating it correctly for now, but it’s something I plan to watch as the test progresses. I note that there’s a click deep inside the gun that must be heard to know the magazine is seated correctly.
The first pellet I tried was the JSB Exact RS. As light as this domed pellet is, I felt it would compliment the power of this airgun well.
This 7.33-grain lead pellet averaged 519 f.p.s. and ranged from a low of 507 to a high of 542 f.p.s. At the average velocity, it generated 4.39 foot-pounds of muzzle energy.
Next, I loaded RWS Hobby pellets. At just seven grains, I expected them to be the velocity champs among the pellets, but they turned in a disappointing average of 491 f.p.s. The spread, however, ranged from a low of 443 f.p.s. to a high of 532 f.p.s., indicating the gun was running out of gas. This was after fewer than 30 shots had been fired! Well, it’s possible that I shot it more times while writing Part 1 and just didn’t remember it.
I installed two new CO2 cartridges; and as the old ones were expelled, they both lost a lot of gas. The rifle was not firing at this point, so a lot of gas was being wasted. I kept track of each shot these new cartridges gave, so I could report the total shot count.
With the new cartridges in place Hobbys gave an average 549 f.p.s. The spread, though, was still very large, extending from a low of 507 to a high of 592. Since the first four shots also expelled a cloud of CO2 vapor, I know they were artificially higher than the average, which was more in the 520 f.p.s. region.
I don’t know what to make of these velocity numbers. Clearly, Hobbys were all over the place, depending on how new the CO2 cartridge was. I would guess their average is really closer to 520 f.p.s., which would give them an average muzzle energy of 4.2 foot-pounds.
I must also note that Hobbys were too large to seat in the chambers of the circular clip easily. I had to use the Air Venturi PellSet to get them into each chamber far enough for the clip to rotate freely. Perhaps, that might explain their erratic behavior.
The next pellet I tested was the Crosman Premier 7.9-grain dome. These averaged 472 f.p.s. in the M14, and the velocity spread went from 457 to 482 f.p.s. At the average velocity, this pellet averaged 3.91 foot-pounds of energy at the muzzle.
I mentioned in Part 1 that I felt the trigger was close to a military pull. Well, it breaks at an average 6 lbs., 5 oz., so it’s just a little heavier than the standard 5-lb. military pull. The pull is a little creepy, but it’s not bad. I will probably have more to say about it after the accuracy test.
Shots per fill
We’re using two CO2 cartridges in this rifle. So how many shots does that give? I disregarded the early cartridge swap and started counting after the new cartridges were installed.
I got a total of 112 shots before feeling it was necessary to change the cartridge. That’s a good number for everything else this gun does. Let me tell you how it went.
I used mostly JSB Exact RS pellets for this test, so I could see where the power was at any given time. After the first 40 shots, the gun no longer shot above 500 f.p.s. It stayed around 470 until shot 88; but if several shots were fired quickly in a row without giving the gun time to warm up again, the velocity dipped down to almost 400 f.p.s. Stop shooting a minute, though, and it’s back to 470 with the RS pellet.
After shot 88, the rifle dropped below 400 f.p.s. for the first time and started slowing down. If 5 shots were fired rapidly the velocity at the end was only 312 f.p.s. After shot 104, the gun was always in the 300s. I stopped at shot 112 because I felt the gun could jam if I went too much farther. Shot 112 was fired after a minute’s pause and went 335 f.p.s.
Impressions so far
This rifle is turning out to be somewhat different than I thought at the beginning. It isn’t as consistent as I’d hoped. It suffers too much velocity loss from the cooling effect as the gun shoots. That will be expressed as vertical stringing on any targets. The best accuracy will come by pausing a minute between shots.
Accuracy is next. I am very curious as to what we will see.
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