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15 February, 2014

QB78 Repeater Test With Cock On Opening Mod.

The new cock on opening version of the QB78 - and QB79 - Repeater allows a very wide variety of pellets to be used.

Crosman Premier Hollow Points work just as well as with the cock on closing version, but many other pellets - all the ones we've tried so far - feed very well, too. The cock on opening version really is the "universal" Repeater if you want to shoot a variety of pellets!



The QB78 Repeater tested for this post.


Following are the results of some tests with a standard QB78 Repeater in .177 cal (the lowest cost model), when equipped with the cock on opening mod.

The fps figures are given for 75 degrees F with .177 cal pellets.

805 fps - Gamo Raptor Gold pellets, 5.0 Grains (alloy)
795 fps - Stoeger X-Speed pellets, 5.56 Grains (alloy)
742 fps - RWS Hobby pellets, 7.0 Grains (fastest lead pellets)
725 fps - Stoeger X-Sport pellets, 7.48 Grains
705 fps - Crosman Premier Hollow Point pellets, 7.9 Grains
697 fps - Stoeger X-Match pellets, 8.18 Grains
687 fps - Stoeger X-Field (H&N Field Target Trophy) pellets, 8.64 Grains
629 fps - Stoeger X-Power pellets, 10.19 Grains
611 fps - Stoeger X-Magnum pellets, 11.57 Grains

As these figures show, all versions of the QB78 Repeater and QB79 Repeater also offer an increased muzzle velocity of 100 fps compared to a gun in regular factory condition (when shooting the same pellets), so you gain 10 shot repeating capability as well as a significant increase in muzzle velocity with our Repeater Upgrades.

Most airgun makers play the "muzzle velocity game" using Hobbys for their claimed "with lead" muzzle velocity. On the same "industry standard" basis, the QB78 Repeater can now be specified at a muzzle velocity of 740 fps with lead and 800 fps with alloy pellets at 75 degrees F. (Of course, the numbers would be even higher at higher temperatures).

Here's a chart that gives a graphic view of how muzzle velocity and pellet weight vary for the .177 QB78 Repeater. Click to enlarge.

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This blog shares information, ideas and knowledge about air rifles. It compliments the information Stephen publishes on the Archer Airguns website, on YouTube and the Chinese Airgun Forum.

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