FX Impact Pellet Probe Size Comparison?

Does anyone have a good picture comparing the probe sizes between calibers? I can't seem to find one. I just received my .25 cal barrel kit and the probe looks really large like it should be for a .30 cal. I'm coming from a .22 so to me the opening looks really large but maybe I'm wrong?

Here's a picture:



On a positive note, the new barrel came etched on the back of the shroud marking what caliber it is! Too bad they don't etch the probe.