When Berger first made a ballistics program freely available some years ago it was in a downloadable form. I tried it and found that it gave results that agreed closely with those from JBM Ballistics and also with the tables in the Sierra loading manual Vol 4, so I have continued to use it.
I tried to use it on a new computer recently and found that it would not run because Java was not installed, so being in a bit of a hurry I used the Berger on line program instead. I did not believe the results, so I got out my old laptop and tried again with the old program. I was wanting trajectory figures for the Sierra 6.5mm 130gr TMK projectiles at a muzzle velocity of 2900 fps.
The results with each program were wildly different. For example, with the old program the retained velocity at 1000 yards was 1390fps and with the on line program it was 2055fps! The same sort of thing occurred when I tried calculating the trajectory of the Sierra 308 155gr Palma MK at a muzzle velocity of 2900fps. I checked and double checked that I had entered the correct values.
Can anybody throw any light on what is happening? There is obviously something seriously amiss.
T I A
I tried to use it on a new computer recently and found that it would not run because Java was not installed, so being in a bit of a hurry I used the Berger on line program instead. I did not believe the results, so I got out my old laptop and tried again with the old program. I was wanting trajectory figures for the Sierra 6.5mm 130gr TMK projectiles at a muzzle velocity of 2900 fps.
The results with each program were wildly different. For example, with the old program the retained velocity at 1000 yards was 1390fps and with the on line program it was 2055fps! The same sort of thing occurred when I tried calculating the trajectory of the Sierra 308 155gr Palma MK at a muzzle velocity of 2900fps. I checked and double checked that I had entered the correct values.
Can anybody throw any light on what is happening? There is obviously something seriously amiss.
T I A
