I wish the gunning lines on Stihls would be a bit more raised...1/8" more.
I was off a couple-6', in about 80 yesterday. I know I need my eyes checked and am coming to accept I might need glasses.
When I train fellers, I tell them to use the gunning sight like a sniper rifle, not a shotgun. Yesterday, I just dogged the saw into the humboldt face-cut and stepped 6' back. I had to adjust as I went slightly to the left, while cutting the horizontal, trying to sniper the trunk between 4 orchard trees (6-8' wide), all expendable and not really wanted.
Midway up the trunk I was out by 2.5-3', dead center on the pear tree trunk, rather than maybe snapping off a few small branches. My efforts were wasted from trimming some of the branches on another fruit tree that I was expecting to hit to the left. I figured preventative pruning, rather than prune based on breakage, would be better. Then I remembered my old supervisor telling me how at Parks, he got on a streak of hitting the picnic tables wherever he moved them, rather than leaving them in danger wherever they were. Totally missed the prophylactically-pruned tree by about 4-5' (expecting to hit it 2' into the canopy).
I don't think I could cut an angle correctly the first time, very easily with a ms661 and a 32" or 36" bar, whichever it was. first
With doing lots of root-disease tree fells, the hingewood is very often much better at head-height, so I set my horizontal first, 'throwing the saw up up' off my knee and pushing the saw against the tree to hold it, which is easier than lifting it up and positioning it. The dogs also help to take the load, and position it. I've never tried a sizable humboldt-cut sloping cut-first, nor have I seen it done.