Use large primer brass with N140. If you have small primer cases, use N150 which ignites more easily. Either works in the 308 with 185s, but here in the UK where we've used this powder make heavily for a long time, small primer Lapua 'Palma' brass, an SRM or 'match' primer and N150 is the norm with the 185gn Juggernaut and the heavier bullets that have since been introduced.
N150 works fine with lighter bullets too. I've long used it with 155s with excellent results in large primer brass.
Vihtavuori serially grades its powders as slower burning than actual applications and results suggest. Neither N150 nor the slower burning N550 'high-energy' variant are anywhere near as slow burning as any of the 4350s hence their being so well suited to the 308. Nor is N160 nearly as slow burning as IMR-4831 as shown in burning rate charts being between H4350 and the 4831s, but closer to the former.
(Note that QuickLOAD's base data also apparently uses over-slow values presumably as supplied by the manufacturer and in the case of N160 especially, can lead to the adoption of seriously over-pressure loads. I subtract 5,000 psi from my QL target load for initial load trials with N160. eg if I want loads producing c. 58,000 psi as my maximum initial test charge, I substitute whatever charge is calculated to produce 53,000 psi.)