Thread: Downhill shot

Woaahhh way too much info!
Draw a triangle. It's the horizontal axis that is the true ballistic distance.

Originally Posted by JT_NZ

From Kestrel 5700 AB

Baseline data
Gun
MV	2500fps
BC G1	0.646
BW	140gr
BD	0.264 in
ZR	100m
BH	2.00 in
Twist	1:8.00 in R
Enviro
Wind	0.00 MPH
Lat	-40 degrees
Temp	20 Deg Cel
SP	29.92 inHg
RH	60%
D/A	763ft

Distance (m)	0 Degrees Mil Hold	Hold in cm	+30 degrees Mil Hold	Hold in cm	-30 degrees Mil Hold	Hold in cm
100	0.00	0	-0.12	-1	-0.12	-1
200	0.70	14	0.45	9	0.45	9
300	1.65	50	1.27	38	1.26	38
400	2.73	109	2.21	88	2.19	88
500	3.94	197	3.26	163	3.22	161
600	5.27	316	4.42	265	4.36	262
700	6.74	472	5.70	399	5.62	393

Interesting, I haven't seen such a big difference between up angle and down angle as in that table before. Dunno what that means, guess you'd need to check it and verify it by shooting. There was a manual device in the past called a 'Mil Dot Master' that used a string and a weight to give you the angle then that gave you a correction for range as estimated off the mildots in the scope. Surprisingly accurate to be fair, but a wee bit of fluffing about to achieve the corrections...

Geez I can't understand why all the confusion over a 300yard shot, my range finder has TBR so I just use the TBR corrected distance it gives me and it's been good enough, I shot a spiker last week decent downhill angle at 400yards hit it exactly where I wanted.
Mate shot a stag same trip 682yards very steep uphill shot and tbr range was spot on too.
Am I missing something ?
We dial for our shots not holdover just for clarity

Originally Posted by dannyb

Geez I can't understand why all the confusion over a 300yard shot, my range finder has TBR so I just use the TBR corrected distance it gives me and it's been good enough, I shot a spiker last week decent downhill angle at 400yards hit it exactly where I wanted.
Mate shot a stag same trip 682yards very steep uphill shot and tbr range was spot on too.
Am I missing something ?

Some people overthink things and make mountains out of molehills. Get fecking closer, you have to recover animal anyway, or man-up and pass on the shot.

There will be a slight difference between uphill and downhill. Uphill is going against gravity so will slow down a bit more, downhill is going with gravity so will slow down slightly less.

Originally Posted by woods223

Some people overthink things and make mountains out of molehills. Get fecking closer, you have to recover animal anyway, or man-up and pass on the shot.

I wouldn't have thought a 300y shot was that far to consider passing up, easily ethical with most centerfire offerings for example; a 270win with standard 130gn interloks zeroed at 200y is only 6" low at 300y, a good rest and holding a little high would easily see you sorted.
I do agree with the comment "get closer if you can, as you point out you've got to recover it anyway."

Some interesting stuff here for those who like to understand how things work
https://www.sierrabullets.com/exteri...inclined-fire/

Originally Posted by Micky Duck

point and shoot.....job done.

You're showin your age Mick - its a lot more complicated that that these days, and thats why you need your iphone before you make the shot.
Just as well the deer aren't in a hurry no more

Personally for a 300y shot I probably wouldn't bother dialing just hold a little high, job done

personally for a 300 yard shot the hold a little bit high is actually ONLY a little bit lmfao.....see above chart and knock and inch off/add inch on

Originally Posted by Micky Duck

personally for a 300 yard shot the hold a little bit high is actually ONLY a little bit lmfao.....see above chart and knock and inch off/add inch onAttachment 220321

Correct depending on your zero, 100y, 200y or whatever you choose to zero at

Not really @dannyb, when shooting up or downhill the bullet drops less so aim a bit lower than a horizontal shot of the same distance.

thus the add/deduct inch comment ...but youknew that.... actually matey..seen as though you have already done the flash harry chronicgraph thingy....just for shits n giggles can you PLEASE USE YOUR .308 LOAD DATA AND CHART and same with your dirty06ai and stick the new flash data up beside old old needs a zimmer frame data with as near of projectile weight as youve got...just so folks can see that real world difference isnt that huge

Originally Posted by RUMPY

Not really @dannyb, when shooting up or downhill the bullet drops less so aim a bit lower than a horizontal shot of the same distance.

Hence my earlier comment about using tbr range finder

Originally Posted by dannyb

I wouldn't have thought a 300y shot was that far to consider passing up, easily ethical with most centerfire offerings for example; a 270win with standard 130gn interloks zeroed at 200y is only 6" low at 300y, a good rest and holding a little high would easily see you sorted.
I do agree with the comment "get closer if you can, as you point out you've got to recover it anyway."

300+ + being the OP comment but agree with you.