11-11-2017, 09:07 AM
What you could do that is more precise is shoot groups at your 750yd range and note the drop.
Zero for 100 and then record the drop for each 100 beyond that. Or, if ammo and time is a factor shoot a few groups at 300 and 700yds. Then play around with Strelok to predict the velocity by matching the actual drops to a particular velocity. Normally we determine velocity first and use that to predict drop at various distances. This way you are doing it the reverse.
Kestrel's with Applied Ballistics have a feature where you enter the chronographed velocity, shoot at a known distance and notice the difference between the predicted drop and actual drop. Then return to the kestrel and enter this difference to fine-tine your velocity. This is because all chronographs come with a margin of error. The Chony I use states it can be up to 5% error. Add to that any further error from the way it is set up on the day and it's unlikely the chronograph is going to exact. 5% of 2,500fps is 125fps which is a fair error and might explain why your bullets don't land exactly where your ballistics program says they should land. I don't know if Strelok has a similar feature to Applied Ballistics and maybe someone else can chime in here.
But...the other guys are right, you will need a chronograph at some stage if you ever want to do meaningful load development.
Zero for 100 and then record the drop for each 100 beyond that. Or, if ammo and time is a factor shoot a few groups at 300 and 700yds. Then play around with Strelok to predict the velocity by matching the actual drops to a particular velocity. Normally we determine velocity first and use that to predict drop at various distances. This way you are doing it the reverse.
Kestrel's with Applied Ballistics have a feature where you enter the chronographed velocity, shoot at a known distance and notice the difference between the predicted drop and actual drop. Then return to the kestrel and enter this difference to fine-tine your velocity. This is because all chronographs come with a margin of error. The Chony I use states it can be up to 5% error. Add to that any further error from the way it is set up on the day and it's unlikely the chronograph is going to exact. 5% of 2,500fps is 125fps which is a fair error and might explain why your bullets don't land exactly where your ballistics program says they should land. I don't know if Strelok has a similar feature to Applied Ballistics and maybe someone else can chime in here.
But...the other guys are right, you will need a chronograph at some stage if you ever want to do meaningful load development.