Those bolters are also sized for Astartes ;)  There's a reason one doesn't mix weapons between systems.  They're VERY different scales (yes, even RT!).<br/><br/>And these stats, by the way, are for the Autocannon.<br/><br/>Autocannon Heavy 300m S/2/5 4d10+5 I 4 20 2Full — 55kg 1,000 Scarce<br/><br/>It weighs 55kg, sure, but Strength 50 (what you need for bulging biceps) lets you tote around 200kg.  One should also mention that the damage is applied PER SHOT of the Autocannon, so at full auto with 50 BS, you're firing at BS 70.  For every extra hit, that's another 4d10+5 per shot THAT ISN'T REDUCED BY ARMOR. Plus, you have the possibility of landing 5 of these hits a turn.  This isn't even counting Righteous Fury.<br/><br/><br/>There's a reason this thing is outright banned in most groups. In one salvo you take down even the hardiest Space Marine quite easily.