For Viht grades, N160 and 165 are the obvious and well-proven choices. The latter gives excellent results at the cost of running slightly / moderately compressed charges in Lapua brass, and has the plus of being a very cool-burning powder associated with excellent barrel life. It'll give either weight bullet the widely used 2,820-2,850 fps MVs from a 30-inch barrel.
You do realise IMR-4166, as with all IMR 'Enduron' grades, is double-based? A friend has described N555 as 'the N100 that pretends to be a 500.' At 3,700KJ / Kg specific energy content, it's the same as N120, 140, and 170 and is actually rated as lower energy than N150
https://www.vihtavuori.com/powders/n500-powders/
https://www.vihtavuori.com/powders/n100-powders/
I would never advise N150 for this cartridge with 175/180s, far too fast burning despite what burn-rate charts show. N555 appears to be slightly faster burning, or even the same burn-rate, as N160 based on Viht's limited range of published loads comparing maximum charges for the same bullets. In Creedmoor / 260 Rem sized cartridges, the two powders have more or less same maxima, N555 even marginally higher with some bullets. In the two largest cartridges covered by Viht - 30-06 and 284 Win - its top charges then become slightly lower than those for N160. I've tried N555 in 7mm-08 and 260 Rem with 160/142gn bullets so far and got decent, but not spectacular results.
Given that N160 is shown as slower burning in burn rate charts (and given a default Ba value in QuickLOAD) than appears to be the case in actual applications, I'd characterise it as a tad slower burning than H4350, but nowhere near as slow-burning as either 4831, that'll also put N555 somewhere in the same bracket.