The magazine holds seven bolts. Six(Black â¦.) It is designed to bypass most armour through brute force and to break a robot's chassis. The Heavy Bolter fires a larger caliber bolt (1.0 caliber, as opposed to the .75 caliber of other bolt weapons, iirc) than others, but is otherwise identical in its functions to other "heavy bolters", whether it's man-portable or affixed to a tank. A .998 caliber round sounds more like a Heavy Bolter round (1.00 caliber) The Bolter also uses electromagnets to propel a projectile using rails. So, who the fuck knows. They all hit the same anyway. The bolter is a weapon that fires a blunt metallic heavy projectile that produces a high amount of force. Godwyn Pattern Bolter is the normal Bolter. Heavy Bolter: There are 8 different Heavy Bolters that can be found within the Commonwealth. Various models on tabletop visually run from .50 to bolter sized bullets to rounds that probably are larger than a heavy bolterâs hanging off a short chain. of the 8 are in the âPhobosâ style and 2 (Templar and Space Wolves) are in a âWolfâ pattern found in some images on the net. What Caliber Is A Bolter Rifle And What Is The Best Caliber For Ar 15 Rifle See Price 2019Ads, Deals and Sales.