Please! Measure the bore of the gun. DO NOT RELY on what the manufacturer says it is. Use a caliper to measure the inside of the barrel, and choose the ball size and patch size based on that actual measurement, and not the nominal bore diameter the factory stamps on the barrel. YOu will save yourself a lot of confusion, money and wasted time trying to use what works in someone else's gun, when your gun's bore diameter is not even close! And, these things vary from one lot to another with the same manufacturer, so don't even rely on someone who bought his gun from the same dealer on the same day at the same time as you did. Both of you need to measure your bores, to find out what they are so you can get the correct components. The .715 ball will probably work in your gun, but as you have already read, some use a very thin patch with that .715 ball to get good accuracy, while others recommend using a thicker patching.
The reason for the difference is that the bores are actually different diameters.
OKAY??? I hope that helps you have a lot more fun a lot sooner. :grin: