by B.B. Pelletier

Part 2
Part 1

The BKL 260 mount we’ve been testing.

This test has taken an inordinate amount of time, primarily because of my illness and some other pressing matters. We’re testing the BKL 260 mount to determine if its clamping pressure is good enough to prevent movement under recoil without a positive recoil stop.

In the last report, I tested the mount on a Hammerli Razor, a standard sporter spring rifle, and it held up fine. Over 500 shots later, it didn’t move. I’d planned to do a similar test on a Webley Patriot, which is the same as a Beeman Kodiak, but as the test drew near I decided that 500 shots were unnecessary — 100 shots would be sufficient. The Patriot/Kodiak is a spring-powered jackhammer that will move or break a scope in very few shots. Today’s test will demonstrate that. Mac switched the scope from the Hammerli Razor to the Webley Patriot generously provided by AirForce Airguns owner John McCaslin. Though this is a .177 caliber rifle, it still has all of the heavy recoil characteristics of the type.

This is the setup Mac used to measure scope/mount movement.

The rails were first scrupulously cleaned with a swab and denatured alcohol. This step is essential to success with these mounts. Tape was placed behind the rear clamp and in front of the front clamp to monitor any mount movement on the rails. The same Bushnell Trophy 6-18×40 was used in this test to keep everything equal. Mac also put tape behind the rear ring and in front of the front ring to measure any movement of the scope in the rings.

After only 8 shots, the scope had moved in the rings.

Mac proceeded to the range to start shooting. After 8 shots, there was considerable scope movement in the rings.

Normally, the test would have ended right there, but Mac was given a small packet of a proprietary product that’s being developed by AirForce. The purpose of this product is to prevent mount movement in the dovetails of a gun. But, Mac figured it would also work on the rings and the scope tube. So he removed the ring caps, reset the scope to zero, and applied this product to the ring caps. Over the next 92 shots, there was no measurable movement in the rings.

A Patriot can be extremely hard on a scope.

The Patriot’s recoil lifted the entire rear sight during 100 rounds of shooting.

The recoil of the Webley also loosened the front objective ring of the scope and separated it from the scope. Many old timers know that the Webley Patriot/Beeman Kodiak is the hardest spring rifle as far as recoil is concerned. Newer shooters are not aware of this, which is why I’m taking the time to explain all the damage this gun did.

So what’s the bottom line with this test? Did we succeed or fail? From the standpoint of the BKL mount not moving on the dovetail, the mount passed the test. However, with the movement of the scope in the rings, the test was not a complete success. The introduction of the proprietary non-slip product that AirForce is developing seems to have solved that problem, so BKL users should be able to use their mounts for almost any heavy recoil situation.