carnaby
Member
I created a Universal Windows App that will work on any Windows 10 device, including desktop, laptop, tablet, and phone. I've put it out for free for the first month so I can get some feedback. It's an early Beta version so it's pretty plain and may have some bugs, but I want to see if it's useful for target shooters and hand loaders.
On your Windows 10 device just search isochronX in the store and you should see it there. It might say it's for $0.99 as I just added the free sale for one month (you can keep the app after that for free if you get it during this month) but it should show up for free in the next day or so.
Anyway, the app requires muzzle velocity, scope height (axis of the scope above the axis of the bore), zero range (typically 100 yards) and then drop data at any interval down range. Drop is positive down, and is measured in inches. Range defaults to increments of 100 yards, but can be changed.
The cool thing about this app is that it computes G1, G2, G5, G6 G7, and G8 BC for your bullet, and ranks them according to how well the work for your projectile. The FOM (figure of merit) is a metric used to rank the different models against your projectile. It's not the best yet, but can be improved in the future.
There are a lot of data fields that aren't used, like bullet brand and model, and scope Moa and Mrad per click, but some data is critical, including muzzle velocity, sight height, caliber, weight, temperature, pressure, and relative humidity (relative humidity doesn't have that big an effect so the default is fine if you don't have a way to get this data).
The app will work with 100 yard zero and one additional data point, i.e. 200 yards, but of course gets better with more data points. I recommend that you use group average drop over 3-5 shots for distance beyond 200 yards, especially if your rifle is less than MOA with a given load.
I don't expect to make much money off this app, just want to see if it might be useful and warrant further features and improvements. It's a lot of work
On your Windows 10 device just search isochronX in the store and you should see it there. It might say it's for $0.99 as I just added the free sale for one month (you can keep the app after that for free if you get it during this month) but it should show up for free in the next day or so.
Anyway, the app requires muzzle velocity, scope height (axis of the scope above the axis of the bore), zero range (typically 100 yards) and then drop data at any interval down range. Drop is positive down, and is measured in inches. Range defaults to increments of 100 yards, but can be changed.
The cool thing about this app is that it computes G1, G2, G5, G6 G7, and G8 BC for your bullet, and ranks them according to how well the work for your projectile. The FOM (figure of merit) is a metric used to rank the different models against your projectile. It's not the best yet, but can be improved in the future.
There are a lot of data fields that aren't used, like bullet brand and model, and scope Moa and Mrad per click, but some data is critical, including muzzle velocity, sight height, caliber, weight, temperature, pressure, and relative humidity (relative humidity doesn't have that big an effect so the default is fine if you don't have a way to get this data).
The app will work with 100 yard zero and one additional data point, i.e. 200 yards, but of course gets better with more data points. I recommend that you use group average drop over 3-5 shots for distance beyond 200 yards, especially if your rifle is less than MOA with a given load.
I don't expect to make much money off this app, just want to see if it might be useful and warrant further features and improvements. It's a lot of work
