I have not used a Partner but my preference would not be a light weight aluminum press. I'll concede that they should be able to handle almost anything, otherwise they could hardly remain on the market. But as you and others have reported, they break, have resizing difficulties, or feel like toys. For single stage, I use two of the massive Herter's Model 3 presses so rarely have difficulty with anything. The only problem has been with the four Rem Ultra Mag calibers. With the .300 in particular, probably due to an under sized sizer die, almost stuck a case. But with a rare stroke of genius, or just plain luck, was able to extract the case without ripping off the rim. Otherwise all larger mag cases size and extract like a breeze. If only still available, everyone should have a Herter's Model 3 press. But they are a bit much for just handgun loading.
