Re: Tail wind effect at 1,000 yards?
I'm not completely satisfied with the 7RUM, but it does OK for conventional LR. To answer your specifics: it has a 30" 1:9" Kreiger in a heavy Palma taper, & I think that's plenty of twist for a 176. I personally wouldn't go with a 1:8 unless you want to 'over' stabilize it.
As far as case quality, I haven't split a case neck yet, but I only get 3-4 loadings each before the primer pockets are GONE! Very disappointing. Case consistency is so-so, there's very little stretch too. Accuracy has been @ 3" to 3.25" at 500. It's easily capable of cleaning a 1,000 yard NRA target with a respectable X-count.
If you need some 156s for testing in the meantime, I have 10-20 laying around the shop. They shoot about as accurately in mine as the 176s & nearly the identical POA-POI at 500. They're yours if you want 'em! [img]images/icons/smile.gif[/img]