Can someone run a quick load check for me. For a 260 Remington Hornady case federal magnum primer 45.2 grains of reloader 23 and 130 grain game changer
130gr GameChanger isn't in QuickLoad so you'd have to provide the length of the bullet in addition to the other data.
In general, the more precise the data input the better the estimated output data. Variations in chamber dimensions, barrel bore, cartridge neck tension and a few other things can cause QuickLoad estimates to be different than your actual results.
For best estimate, you'd need to provide;
Barrel Length
Case Volume
Air Temperature
Cartridge Overall Length
Case Trim to Length
Powder and Powder Charge Weight
If you would be satisfied with a just a general estimate of the resulting pressures and velocities then at a minimum you'd have to provide;