The trajectory should be straight away from you!
In all seriousness, it depends on the muzzle velocity of your particular rifle. (2) identical rifles will for whatever reason (bore condition, patch type, lube, etc.) Fire at different rates of speed. Once you know that, I just plug it into the calculator...
If you do not have access to a chronograph, post up the details of your load components including what cap type and brand you use. If someone on here has similar stuff, they could ballpark the velocity. It is all down hill from there! (Pun intended)