Large calibre FTW. The small amend mentioned above works well for howitzers and artillery barrages in particular. That said, I am still not entirely sure what to do with a barrage hit on a building.
One of the big reasons why rubble was an issue was that it often ended up in the streets, which kind of clogged things up for vehicles and movement in general.
45 years of club wargaming across pretty much all genres. A few years of game mechanics design (computer aided wargaming). I picked up Bolt Action in version 2 after seeing it at a convention where they pointed to failing eyesight for their move away from 15s. Stopped playing Bolt Action 2 after becoming frustrated with a few of the rules, but pretty then only because the rules were often hard to read even when not buried away in a sea of text; perhaps I was spoilt growing up with Squad Leader. Becoming quickly frustrated with the new version for the same reason.