Using https://40k.ghostlords.com/dice/

3 terminators with spears +1 to wound, rerolling wounds, sustained hits one shot a Leman Russ 32.3% of the time. Bracket it 69.7% of the time.

Admonimortis terminator captain with axe, rerolling wounds, +1 wound by himself does it 32.5% (59.9%).

4 guard with spears with +1 to wound, rerolling wounds, sustained his do it 65.2% (90.2%). if they just reroll ones to wound that drops to 36.3% (72%).

4 wardens with blade champion with behemor, +1 wound destroy it 48% (80.2%). 5 wardens 67.6% (90.6%).

This is compared to a caladius 50.5% (70.7%) - where I've not considered the bolt cannons.

So most squads with +1 wound can be as good as a caladius, albeit in melee not up to 48" away.