Thursday, February 10, 2011

Nokia Ballistcs App for your Rifle Shooting pleasure - $8.49

The Nokia Ballistics app is now on sale. It is the same as the BlackBerry program, but I had to fiddle with the screen layout to get it looking good.
I really like the new program on my $65 Nokia C3.
It works on over 98% of the phone models Nokia tested.

The Nokia benefits from feedback from the BlackBerry users, and the phone is cheap enough to use as a dedicated ballistics machine.

If you have a different screen size on your Nokia post a message at http://www.mobileballistics.com/, I'd like to have a ballistics app for everybody's phone, so let me know.

Thanks to all for their support!

Wednesday, February 09, 2011

Zero in the warm, shoot in the cold

OK, we zero in warm weather, but now it is cold, how do I adjust for that?
Let's look at the warm weather zero. Drop is 0" at 500 yards.
If we drop 59°F, the impact at 500 yards drops 7" in this case:

Zero in the Warm

Here we zero at 59°F at 500 yards.

Shoot in the Cold

Here we change the temperature to 0°F, but we do not re-zero.
At 500 yards we are now 7" low. Note that the "ReCalc Zero" is set to "No". If "ReCalc Zero" was set to "Yes", the drop would be 0", as though we we had re-zeroed in the cold.
So this is a realistic scenario, you zero in one set of conditions, and shoot in another. Your ballistic software must allow you to change conditions without recalculating the zero. Most software would recalculate the zero, and give you 0" drop at the zero distance, even if the temperature had changed.
I didn't lower the velocity in this case, the cold powder would actually give you a lower velocity and more drop (probably, although barrel harmonics can do strange things). You would type in the new velocity if you chronographed again in the cold. Plus, a cold rifle and scope may shift things about too.
So if you are shooting in conditions different from your zero at the range, your mobile software can still be useful.

Tuesday, February 01, 2011

Nokia Ballistc App

Nokia looks OK, the screen is a bit smaller so much fiddling about was required. Otherwise fine.
If you want a free version you can be a beta tester, use the GunSim.com contact form.