Re: .17 HMR at 500 and 800 yards (video) CZ 452
I don't WANT to answer this, I'll only look like a smuck, but...
Ask yourself if the shot to 500 yds is doable. I think, yes.
With a 100 yd zero, and using a CONSTANT G1 BC of .125 (pretty well established as good for muzzle to 200yds, but a real stretch that it's not changing over the next 300 yards as you near Mach 1 and fall to .7 Mach or so/800 ish fps)
Come Ups 100 to:
200 4 Min
300 11 Min
400 22 Min
450 28 Min After 450 yds, my program won't allow continuation with this BC/velocity combo, BUT we can reasonably estimate:
500 36 Min (Based on progression per 50yds & It's a parabola)
Lets just call it 40 Min requred, 100 to 500yds.
Could he dial it in? Who cares. Use Mil holdover.
40 Min = 11.6 MILs
Can you see 11 or 12 mils on your scope? Sure. Assume it Mils at 10X (4-16 scope stated? 10 or 12X is a common Mil Cal power). Dial down to 5X or 4X. Your "apparent mils" on the scale now have twice or two and a half times their value. So, 5 Mils on the SCALE is now spanning 10 Mils at 5X or 12 1/2 Mils at 4X
Would it penetrate .08in (2 milimeter) sheet steel? Likely
The remaining Vel at 450 yds was 860 fps. Lets estimate (by progression per 25 yds again from the computed data) a 500 yd velocity of 810 fps. That velocity is RIGHT in the HEART of many .177 cal pellet rifles muzzle velocities. Will they, with the common 8 to 9 grain lead pellets pepetrate an old washing machine? You bet. (one piece of metal, NOT the entire washer!)
Was the shooting really at 500 yard and beyond? Maybe. I think I can hear a "noise" after every shot, that seems to be the same kind of noise. Assuming it's coming from the target and not an echo from another surface, Count fast, 1 to 10. (As fast about as you can say the numbers, will be about 1 sec to cound to 10. From before WWI thru WWII they USED to teach this, counting between hearing the CRACK as a round passes you till you hear the MUZZLE REPORT as a ranging method. 100 yards per count. So, 6 would be 600 yards. Time of flight for THIS round is 1 sec to 440 yards. I'm counting past "8" to the "noise", so that locates the sound source as about 240 yards or more away. Say, .4 sec TOF plus .6 sec for sound to get back to camara. I only ran the vid once and am not going back. The counts could be improved likely. This kinda supports the idea that he ment 500 feet, not 500 yards.
In summary: Yeah, It's possible. It doesn't take a $1000 scope, you just need to be able to see the target or an offset aimpoint. You'd have to be blind looking through cracked lenses NOT to see a 3+ MOA white plate. If an 8gn .177 pellet rifle at 10 yds has about the same velocity as the .17 17gn bullet at 500, yeah, it could penetrate MILD sheet steel. But I'm not even going to try to explain away the groups or windreading. Possible, I belive NOT PROBABLE--but have offered no support.