I did manage to finish a couple of customers' jobs and so yesterday - instead of staying here & working on my yard - I hauled the 260 Imp 30* & Weaver 6-30x56 down to the range. I'd finally gotten my hands on a jug of IMR 4350, and wanted to run some test loads over the chrono before backing off to 1000yds. Conditions were pretty decent, with clear sky, temp of 81*F, and light wind from 2:00. After confirming my 100yd zero & chrono data, I backed off to 995yds, entered all the condition data into the Applied Ballistics app from my Kestral 4500NV, and set down to shoot some S142MKs with N165. That load was running only 2735fps, but the IMR 4350 loads had chrono'd only 2655 at 100, so I didn't even bother to shoot any of them from 995. I'm pretty sure I can get 2800+ out of 140s in this rifle, just haven't pushed it that hard yet.
At any rate, the app called for a 7.4 mil come-up, but it wound up requiring 8 mils to get centered on steel IPSC targets. The four shot group (first one was a miss which I corrected off of) was spread 7-1/4" horizontally, but had only 1-3/8" of vertical. Given the variability of the wind, from 2:00-3:00, near calm to about 5mph, I don't feel at all bad about the horizontal spread. If I can bump the speed up a bit without introducing an increase in the vertical spread, I'm golden. Whatever - I again was running the scope at 30x, and even with the slight miarage running from right to left, could see what I thought were bullet splashes on steel. Not real distinct, but as it turned out, what I was seeing were indeed the splashes. No more distinct than they were up close, I'd say the resolution & clarity of this scope are pretty decent.
The .6 mil low impact is something I believe I'm going to have to deal with by training my app. The scope's correction factor I entered in the app (see post#71) only works out to about 600yds - after that, the impacts are progressively lower than what the app calls for. I'm seeing the same thing with the Kahles K624i AMR scopes on both my 6x47s, so it's obvious that I need to buckle down and get to work to train the app. In fact, I also shot the Bighorn 6x47 with the Kahles yesterday, and saw a similar result with low impact using S107MKs from 995yds. But, after that, I shot some Berger 105 Hybrids, and had to come DOWN a tenth & take off .2 mil from the app's recommended wind correction. So it would appear that the G7 BCs for both of the Sierras are a little high, and that of the Hybrid a bit low, rather than my chrono data being faulty. Hard to say for certain whether it's entirely the BC, velocity, or a combination of BC & velocity. I can get back to 1200yds on my range without moving the targets away from the backstop, so I'll try the training method on the velocity side of things first and see what happens.
Long, drawn-out post, but I'm still pleased with the Weaver. However, I will continue to lobby for a more capable reticle.