I'm currently running bolters as follows in my RT game, where anything might pop up and shoot at my party:
Normal bolters: as written
SoB issue, 1d10+6, pen4. Matches the Sacriston (I think that's what it was) from IHB. Still reliable.
Astartes Bolter and pistol: 2d10+2, pen4. Toned down a little, but still better. I do realise technically it has the potential to do less than a normal bolter, but with tearing, it should be quite rare. The differences in armour are quite narrow, and pen is reductive, so I err on the sider of lower pen just so armour has a point.
Astartes heavy bolter 2d10+6 pen6. Still a nasty anti-personnel weapon, able to take special ammo, but not the be all and end all it seems to be right now.
All still use tearing, and all RoF is unchanged.
