Except by that exact source, mass shootings with rifles are under reported and the deadliest mass shootings were done with semi automatic rifles.
“Since 1982, there has been a known total 65 mass shootings involving rifles, mostly semi-automatics. This figure is underreported though, as it excludes the multiple semi-automatic (and fully automatic) rifles used in the 2017 Las Vegas Strip massacre – the worst mass shooting in U.S. history, killing 58 and wounding 546. In fact, semi-automatic rifles were featured in four of the five deadliest mass shootings, being used in the Orlando nightclub massacre, Sandy Hook Elementary massacre and Texas First Baptist Church massacre.”
I’ve found it easiest as a two step process, first removing all the vines using loppers (the kinda bolt cutter looking things), and then once that’s all been trimmed close to the ground and all the vines discarded, then using a normal shovel to uproot them.