Very good info qball! Especially the BC stuff. I do the same thing when I get a tune I want. I'll test the numbers in Strelock Pro, until it dials spot on, regardless of distance. It works really well with the .22 and .30 slugs. I haven't tested it much in .177, since I machined the barrel for the Maverick, but the same thing does apply for sure. It sure is cool to be able to dial in a distance and hand your gun over to someone else and watch them pop a long range target on the first try
Here is my test data:
NSA .22 slugs in Superior 1:24:
20 grain shot ok at 800+ FPS, 1-2 inch at 100 yards. With published BC POI is about 0.1-0.2 mil low with strelok at 900FPS. SG is 1.13
23 grain shot very well at 800+ FPS, sub MOA at 100 yards. TWith published BC POI is about 0.1 mil low with strelok at 900FPS. SG is 1.14
26 grain did not shoot well, well over 2 inch at 100 yards. SG is 0.95
NSA .25 slugs in Superior heavy 1:18:
29 grain shot very well at 800+ FPS, sub MOA at 100 yards. With published BC POI is spot on with strelok at 920FPS. SG is 2.51
34 grain shot very well at 800+ FPS, sub MOA at 100 yards. With published BC POI spot on with strelok at 900FPS. SG is 2.35
36 grain shot very well at 800+ FPS, sub MOA at 100 yards. With published BC POI is spot on with strelok at 900FPS. SG is 2.31
EDIT: all GS I listed are calculated at sea level or 0 feet aka worse case, as altitude go up the GS will go up fairly significantly. It's a small but significant detail not everyone pays attention to, GS will change with altitude along with DOPE.
I haven't tried with .22 superior heavy because the superior shoots the 23 grain really well plus I haven't really have time to shoot my impact for quite a few month. From my data it is clear to me that having SG over 1.5 the published BC seems to be spot on in strelok and SIG BDX app and Garmin applied ballistic software. I don't have to mess with adjusting BC at all. Just zero, plug in the info and just spot on. I can tune for a certain speed, zero, pick a profile in BDX app and go hunt in 30 minutes or less.
You comment on handing your friend a gun that's dialed reminded me of my experience with doing that. Friend of mine was popping soda bottle caps at 100 yards on his property with my impact, I saw a house house sparrow on a tree branch 101 meters or 114 yards away. I told him to go for it and told him the number of clicks to dial, he dialed the scope then put the center dot on the sparrow and POP!!! The look on his face was priceless!!! Then few months later we decided to shoot a water bottle 165 yards away after hunting, he bought an Avenger and it shot well under 100 yards. He must of shot 15 shots and couple shots got close. I ranged and missed a little low (hard to range a bottle on the ground 165 yards away), 1 click up and I was on the bottle on my third shot. Handed him my impact and he put the center dot on the top half of the bottle and POP! He shot it again and POP! He turned around, gave me back my impact and sold the avenger the very next day. LOL!