I'll give it a go.
Here's the first shot @ each distance for drop validation.
Purpose: Validate velocity. The chrony can't have been correct.
1908 Mauser Action (Brazilian)
Lilja Barrel Finished 27" w/0.655" muzzle diameter. (Barrel fitted by Ray Montgomery - Longmont CO.)
Optic: 10X Super Sniper - Mil Dot
Load - As shown above - 59 gr 7828ssc - CCI 200 primer - Berger 140 VLD Match Grade - Lot# 0000973
Guestimated MV: From weird chrony readings - 3366 FPS
200 yard zero data was 65*F, 25.50 "Hg
Entered data into JBM Trajectory Calculation. Created chart in MILs out to 1000 yards.
Used Byan Litz bullet data.
Entered data into "Shooter" with perfect agreement with JBM.
Stuck shooting gear and rifle in the back pack (28 lbs) and headed for the shooting spot.
Shooter inputs at the shooting spot:
Baro: 23.26 (Multiplied the Leica 1600 psia by 2 - close enough
Wind 15 MPH from 270*
Muzzle Velocity: 3366 FPS
This being the 3rd serious trip to this spot it's beginning that the wind is kicking my but by least 20%. The wind meter had no better than 10 mph from where I was.
I held into the wind as directed by "Shooter" intending to watch the video for the education. (I appear to be in remedial wind reading!!
Shooting distances were selected, considering range and angle, to shoot with whole MILs without having to interpolate between dots.
Test: If drops are spot on, then so is the input velocity.
Shot #1 - 448 yards - 19* down angle
Shot #2 - 590 yards - 9.0* down angle
Shot #3 - 750 yards - 11* down angle
At that elevation, ~6600' 5 MILs drop was right at 980 yards. Didn't take that shot today. Thinkin' I'll get the kid to upgrade the scope to an MOA reticle and target turrets. Who says the ol' Winny ain't a LR rig? @4800' elevation 1k del = 1855 w/1070 FPE. Woot Woot!!!
590 yard shot - the little round POI is pretty close to 0.20 Mils. Hit is about 0.20 mils up from center.
750 yard shot - The MBR (minimum bounding rectange - GIS speak
) around the POI is 1.0 Mils square.
270 Win Initial Drop Chart Confirmation :: 448 yd initial drop confirm shot video by royinidaho - Photobucket
270 Win Initial Drop Chart Confirmation :: 590 yd initial drop shot video by royinidaho - Photobucket
270 Win Initial Drop Chart Confirmation :: 750 yd initial drop shot video by royinidaho - Photobucket