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Combro CB 625 Mk 4

Combro CB 625 Mk 4

Following the demise of my Shooting Chrony, I wanted to buy a replacement. I find chronoscopes invaluable, in conjunction with Chairgun, for plotting the trajectories of different rifle/pellet combinations.

Having seen the price of new F1 Chronys (142.80€ plus shipping) and similar tripod-mounted systems, I decided to go for a Combro, which at £49.50 plus free shipping to France seemed to be a bargain.

combro1-jpg.18142


I refused to pay £3.95 for the plastic stick called the Alignment Tool, preferring my own low-tech (and free) approach. Masking tape did the job securing the device in place, on first use.

combro2-jpg.18143


Then forum member sarfarm suggested Velcro as an alternative. Rubber bands are the other option.

CombroVelcro1.jpg

CombroVelcro2.jpg


I ran 12 pellets through it from the BSA Lightning XL Tactical, which has a fixed Volumetric silencer on board. They were 13.43-grain JSB Exact Jumbo RS (aka Falcon Accuracy Plus), and averaged 541 fps for a muzzle energy of 8.73 fpe. A tad lower than the ideal, but it's my cheap, second-hand barn rifle, used for rats, close-range magpies (25 yards max) and plinking to 33 yards, at which range it will shoot one-inch groups, so it'll do. My "alignment tool" did the job perfectly on this .22 rifle.

I also ran a couple of ten-shot groups through it from my .177 Gamo Coyote. I left the Weihrauch silencer in place, since I normally shoot with it mounted to the rifle. Again, no alignment issues.

The Combro simply slides up and down its barrel bracket to align with the muzzle -- in the photos, you can see the knurled silver knob used to clamp the bracket in place. This plastic-on-plastic mount is very stiff, which is a good thing, since the device didn't move at all during use on either the PCP or the springer, which has a fair bit of recoil. I had been slightly concerned about getting the Combro to align with my various silencers, but this proved to be no problem at all -- there's plenty of adjustment available.

All in all, the Combro seems a well-made bit of kit, at a surprising price compared to the competition. I have had no errors from the unit during use, which compares very favourably with my previous Shooting Chrony. The F1 unit I had was quite twitchy, unless the light levels were just right. The Combro uses infra-red beams inside the two sensor housings, rather than relying on ambient light. This system seems less prone to generating errors than the Shooting Chrony arrangement.

ChronyCloseUp.jpg


I would highly recommend this product to anyone wanting to stay within the UK power limit, or who wants to plot trajectories accurately for hunting or long-range target shooting. For more information or to order direct from the manufacturer, visit http://www.chronoscopes.com/.
Author
Coypu Hunter
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