Cameron,
Gentlemen,

please find below the measured dimensions and information about my Heym Expres in .500 A-Square.

best regards
Rolf

Heym Express rifle

The rifle was aquired in 1991.
All metal parts steel, exterieur parts bead blasted and parkerized.

caliber: .500 A-Square
total length: 116 cm
total weight: 4,6 kg
system: Mauser 98 Magnum (improved, new production of 1990)
controlled round feed, firing pin assembly consists of two parts: a spring tension loaded steel rod for transmitting the strike and the real firing pin; (an additional firing pin is stored in the chamber in the pistol grip)

safety: horizontal 3 position safety, blocking the firing pin
standard trigger, letoff at ca. 1200 grams, crisp

barrel: 610mm / ca. 24”, no muzzle break nor mangna-port
twist: 254 mm = 1 : 10”

barrel dimensions: dia. 31,0mm at the system, cylindrical for 35mm length from system interface toward the muzzle, then tapering to muzzle dia. 21,5mm

magzine box: milled magazine box, capacity 4 cartridges in two rows
inner length 96,5mm, with milled cartridge shoulder stop
floorplate to open with a latch in the trigger guard

sights: system with two flat areas on the upper side, each prepared with 2 threaded bore holes for telescopic sight mount (not used at my rifle), all holes closed with headless screws
front sight: white round front sight, dia 4,0mm, massive steel part
rear sight: massive steel, one standing shallow express leaf marked “50m”,
two folding leafes marked “100m” and “200m”,centerline engraved
distance from rear sight to front sight: 420mm

strap fixing: steel ring over barrel, soldered to barrel; and steel screw in stock

wood: plain walnut stock, enforced with glass bedding and two crossbolts,
rear end of stock covered with pachmayer recoil pad, ca. 43mm wide

balance point: at the interface between barrel and system (rifle unloaded)