Re: Correct Native Drag Model
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bryan Litz</div><div class="ubbcode-body">Saito,
Please don't take offense to the following, you never know the experience level of others in these forums...
When using BC's referenced to standards other than G1, you need to enter a different numeric value than given by the manufacturer. All of the BC's given by manufacturers are referenced to G1. If you select G7 in your program and enter the value given by the manufacturer (or close to it), the results will be unrealistic because the inputs are inconsistent.
I've measured the G7 BC of the Hornady 208 Amax to be 0.324. This is quite a bit different than the G1 BC, but it's right for the G7 standard. Try that number in your program with G7 selected and see what you get. Since the 208 Amax is a secant ogive boat tail bullet, it does match the G7 standard quite well, but you have to give it the correct numeric G7 BC (0.324).
Again, I don't mean to insult your intelligence if you know all this, but wanted to put it out there in case.
-Bryan </div></div>
Bryan,
No offense taken, funny though, I once held an Intelligence Specialist rating. Thank you, I knew the answer was out there. If I'm not learning, I'm bored. I love this site, there's plenty of experience, a little humor and most people are incredibly helpful.
As the G7 Drag Model description best fit the bullet I was using I punched those #s in. They were way off. I'll have to look and see if I can modify the #s in the program(most things are pre-programed; obviously off of the G1 model). To say the outputs were unrealistic would be an understatement. It was telling me my bullet was still doing 2000fps @ 2K.
I noticed that the BC of the given bullet in the G7 model is exactly half of what it is in G1(as far as the Hornady goes). Would you say that is a standard? I noticed your signature line. I shoot 210 grain Berger VLDs as well. Is the G7 BC of the 210 VLD .3155 or .312? Just thinking.
Thanks again for the info.