>>64025192>>64025194>The HE load of a 3.7cm shell was about the same as a grenade.I hate these threads because of 40k nogunz posters like this so much. They're so desperate to prove how strong 40k shit is (and it's always human shit from the setting) that they just spout obnoxiously, infuriatingly, insultingly absurd nonsense and lies nonstop to do it.
The 3.7cm catridge you describe (Sprenggranate Patronen 40) was 35cm long and weighed 1.315kg. The projectile itself was 12.7cm long and weighed 665g with a HE filler of 45 grams. An M67 frag grenade has 180 grams of explosive filler.
40mm HV M383 HE rounds are 11.2cm long and weigh 340g. The projectile is 5.3cm long, weighs 230g and has a filler weight of 55g. There's so little room for propellant that it's subsonic (800fps mv).
Space mehrine bolters are .75 cal, which is 19.05mm. 20mm HEI cannon rounds are around 200-300g complete and 16-20cm long, with projectiles 10cm long, and they only have about 5-10g of filler.
So Spesch Marine bolter rounds are 19.05x76.2mm with an overall length of around 90mm. The 76.2mm bolter bullets are 3/4 the length of 20mm HE, but they sacrifice about 1/4 of their internal volume to propellant which IRL rounds don't do. Effectively, the space available in the projectile for filler is less than half what is in an IRL 20mm HE round, and they also have far less overall propellant volume. Ie. The rounds are probably subsonic, which is supported by their bullet geometry, which is a simple elliptical design and even has a flat base. The bursting charge on bolter rounds is much closer to a cherry bomb than a grenade. 2-5g at most. Like everything in this setting, it seems powerful because you are all too stupid to vibe check it.
I wish that you losers would stop posting 40k shit on /k/. It's the dumbest franchise and none of you can accept that everything in it is factually underpowered trash. Picrel: Here's your space marine bolter round.