$400 With Dial Indicator
$350 Without Dial Indicator

Download instructions and tips sheet (PDF)

Download Competition Stats (PDF)

The Variable Gantry Mount is a new use for an old design.  The use of the Variable Gantry Mount is over one hundred years old.  During World War I and World War II, most guns used them with open sights.  At Miracle Machine Works, we converted the idea to use with rifle scopes.

Using the Variable Gantry Mount
The concept of use is simple; you have more than one position of zero.  By setting the different pins for different ranges, you can extend the useful range of an accurate rifle.

One common way to use this mount is to zero the mount in such a way to keep the actual bullet strike within 4 inches of zero out to whatever range the rifle/caliber is capable of.  For competition, set the base for the different ranges if known; if unknown, generally the maximum range is given.  Divide this range as you wish and enter MOA’s into the mount.  A common method of competition use is to keep a data book with the settings for each competition, and then if you do not change the zero pin, you can change the other pins without the need to shoot the rifle for zero.

Changes in temperature/altitude can be generally adjusted for by shooting at your zero distance and making the necessary changes.  This will change the other pins’ zero in the correct direction and correct most of the change in impact.

A range finder is a necessary tool for accurate long range shooting.  The longer the shot, the more the bullet drop, the larger the error in impact for improper range estimation. Bullet drop information can be determined by: computer generation, guess or information on the side of most quality ammunition. The side of the box usually gives the bullet flight information, which can be easily converted to MOA.  A MOA is approximately one inch for each one hundred yards.

MOA Conversion
100 yards = 1 inch
200 yards = 2 inches
500 yards = 5 inches

So if your bullet drop with a one hundred yard zero is 10 inches, at 200 yards your correction will be 5 MOA.  Please be advised, ANY data used should be checked and corrected by shooting.

Once you have zeroed the pins and use the EXACT ammunition you sighted for, you will never need to re-shoot your distance pins.  Just adjust the rifle to the base with our zero pin.

The zero pin is set first at whatever range you wish, with many people choosing 100 yards, but a range can be used. The zero pin aligns the rifle to the mount and serves as the base pin for the other pins to be set from.  Therefore, adjusting the zero pin changes all the range pins.  This is useful for adjusting for temperature/altitude.  Most hunting camps have a 100 yard range to check your zero when you arrive.  Adjusting the zero pin or scope, moves all range pins; so adjusting the zero pin aids in temperature/altitude adjustment usually within 1 or 2 MOA at all ranges. Most temperature/altitude adjustments can be done with a few clicks of the scope.

If you have the necessary range/MOA information with you, you can reset any range pin to any range without changing the zero pin and maintain a rifle zero.