Patagonia LoadBase 3.0 Mobile ballistic software users may find this post intriguing. I've been using LoadBase 2.0 Mobile, the upgraded LoadBase 3.0 Mobile, and now the recently updated LoadBase 3.0 with the added ability to input G7 ballistic coefficients. LoadBase 3.0 Mobile only accepted G1 BCs until this recent update.
With LoadBase 2.0 Mobile and the initial version of Loadbase 3.0 Mobile (G1 BCs), I had already been shooting Berger VLDs in my 300 Win Mag (210 VLD) and 7mm Rem Mag (168 VLD) . I had already recorded velocities with the 210 & 168 VLDs at the muzzle, 290 yds, and 987 yds over a dual chronograph setup, which helps to confirm I'm getting credible chrono readings. With these velocities, I used the Drag Coefficient (DC) tab in the Analyzer Module to develop a G1 BC and a DC for both bullets.
With these BC and DC values input into LB Mobile, I field tested the LoadBase predicted drops at 295, 600, and 987 yds with both bullets. The 210VLD POIs from my 300 Win Mag were dead nuts on with the LoadBase predicted drops. The 168VLD POIs were a pretty good match, however I did tweek the DC value with the 168VLDs in order to improve the predicted drops closer to my measured drops.
After Bryan Litz announced he was coming out with G7 BCs for the Berger bullets, and after I learned LoadBase 3.0 would be updated to allow use of G7 BCs, I was looking forward to using Bryan's G7 BCs with LoadBase 3.0. I was thinking this combination might result in very good correlation of predicted drops to field tested POIs.
Since I already had the field drops (POIs) and chrono'd velocities out to 987yds for both bullets, after Gus released his G7 BC LB3.0M update, all I needed was some time to input the Berger G7 BCs for both bullets into LB3.0M to learn how close the predicted drops and velocities matched my actual field drops and velocities.
Well I finally made time and here are some G7 BC LB3.0 Mobile results:
168 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Chronographed Velocity . . . . Difference
290yds . . . .2621 fps . . . . . . . . . . . . . . . . . . . .2632 fps . . . . . . . . . . . . . . 11 fps
987yds . . . .1643 fps . . . . . . . . . . . . . . . . . . . .1673 fps . . . . . . . . . . . . . . 30 fps
168 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Measured Drop . . . . . . . . . . Difference
987yds . . . .-195.1" . . . . . . . . . . . . . . . . . . . . .-190.9". . . . . . . . . . . . . . .. 4.2"
210 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Chronographed Velocity . . . . Difference
290yds . . . .2546 fps . . . . . . . . . . . . . . . . . . . .2546 fps . . . . . . . . . . . . . . 0 fps
987yds . . . .1553 fps . . . . . . . . . . . . . . . . . . . .1584 fps . . . . . . . . . . . . . . 31 fps
210 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Measured Drop . . . . . . . . . . Difference
987yds . . . .-211.4" . . . . . . . . . . . . . . . . . . . . .-207.1". . . . . . . . . . . . . . .. 4.3"
I used the default DC of 0.5 with the Berger G7 BCs. LB3.0 Mobile / Berger G7 BC predicted velocities at 987yds were ~30 fps slower than my chronographed velocities with both bullets. The predicted drops at 987yds were ~4 1/4" greater than my measured drops with both bullets. The predicted 987yd velocities are ~1.9% less than my chronographed velocities. The predicted 987yd drops are ~2.1% greater than my measured drops.
My opinion? I'm pretty pleased with these LB3.0M G7 predicted values.
With LoadBase 2.0 Mobile and the initial version of Loadbase 3.0 Mobile (G1 BCs), I had already been shooting Berger VLDs in my 300 Win Mag (210 VLD) and 7mm Rem Mag (168 VLD) . I had already recorded velocities with the 210 & 168 VLDs at the muzzle, 290 yds, and 987 yds over a dual chronograph setup, which helps to confirm I'm getting credible chrono readings. With these velocities, I used the Drag Coefficient (DC) tab in the Analyzer Module to develop a G1 BC and a DC for both bullets.
With these BC and DC values input into LB Mobile, I field tested the LoadBase predicted drops at 295, 600, and 987 yds with both bullets. The 210VLD POIs from my 300 Win Mag were dead nuts on with the LoadBase predicted drops. The 168VLD POIs were a pretty good match, however I did tweek the DC value with the 168VLDs in order to improve the predicted drops closer to my measured drops.
After Bryan Litz announced he was coming out with G7 BCs for the Berger bullets, and after I learned LoadBase 3.0 would be updated to allow use of G7 BCs, I was looking forward to using Bryan's G7 BCs with LoadBase 3.0. I was thinking this combination might result in very good correlation of predicted drops to field tested POIs.
Since I already had the field drops (POIs) and chrono'd velocities out to 987yds for both bullets, after Gus released his G7 BC LB3.0M update, all I needed was some time to input the Berger G7 BCs for both bullets into LB3.0M to learn how close the predicted drops and velocities matched my actual field drops and velocities.
Well I finally made time and here are some G7 BC LB3.0 Mobile results:
168 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Chronographed Velocity . . . . Difference
290yds . . . .2621 fps . . . . . . . . . . . . . . . . . . . .2632 fps . . . . . . . . . . . . . . 11 fps
987yds . . . .1643 fps . . . . . . . . . . . . . . . . . . . .1673 fps . . . . . . . . . . . . . . 30 fps
168 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Measured Drop . . . . . . . . . . Difference
987yds . . . .-195.1" . . . . . . . . . . . . . . . . . . . . .-190.9". . . . . . . . . . . . . . .. 4.2"
210 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Chronographed Velocity . . . . Difference
290yds . . . .2546 fps . . . . . . . . . . . . . . . . . . . .2546 fps . . . . . . . . . . . . . . 0 fps
987yds . . . .1553 fps . . . . . . . . . . . . . . . . . . . .1584 fps . . . . . . . . . . . . . . 31 fps
210 VLD. . . LB3.0 G7 BC (DC=0.5) Predicted . . . . Measured Drop . . . . . . . . . . Difference
987yds . . . .-211.4" . . . . . . . . . . . . . . . . . . . . .-207.1". . . . . . . . . . . . . . .. 4.3"
I used the default DC of 0.5 with the Berger G7 BCs. LB3.0 Mobile / Berger G7 BC predicted velocities at 987yds were ~30 fps slower than my chronographed velocities with both bullets. The predicted drops at 987yds were ~4 1/4" greater than my measured drops with both bullets. The predicted 987yd velocities are ~1.9% less than my chronographed velocities. The predicted 987yd drops are ~2.1% greater than my measured drops.
My opinion? I'm pretty pleased with these LB3.0M G7 predicted values.
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