.308 OCW Load testing results

[pigsy]

Now my rifle round count is up to 900 (.308 Howa 24" bbl) and having used various testing processes I've decided to develop a load for the 175 Sierra MK's with Viht N150 and got the following results using the OCW method (files attached):

Now using the criteria, it's not the best group per se but the most consistent POI that is the sweet spot. Then changing the seating depth for grouping. So a couple of questions for those of far more experience than I:

Where are the nodes in this example? My reading is between 41.5 and 41.8 then 43 - 43.3?
Supposedly the SMK's are very tolerant of jump - will the seating depth really change the grouping that much. How much should I look to change it by?

As side note, having reloaded at least 700 rounds and having gone through most of the "go to" bullets I've learnt the following:

The advice I got on developing a load for 155's a few years ago on FB was very helpful (thank you Tim ENS).

The Howa .308 24" Varmint bbl is a 1:10 twist and not 1:12 as I'd thought. In fact I only discovered this a few weeks ago, bored one morning with the cleaning rod.

Sierra 155's both the 2155 and 2156 shoot well. In fact a reasonably "middelish" load of N140 (43.7 gr) worked out to a 1000 yards. I've no doubt that it was subsonic at that range but it was Ok accuracy wise (ie once dialled in it constantly hit the v-bull/bull on Stickledown). I'm sure not competitive in any sense but very satisfying to be able to shoot at that distance with something you've loaded.

Lapua Scenar's - never really got them to group below 1 moa. More work required.

Cheers