Both the 63 and 151 load through a 'teardrop' in the side of the stock. Loads much faster than loading a magazine.
I hear you on the Taurus; I was leary of my purchase, but the price was right so I took a gamble. And have been very happy with it.
The 63 was originally designed as the '03 for .22 Win Auto, so the design is over 100 years old. It was also in production for close to 60 years, then some Browning repros were made, then the Taurus. Originals fetch a big dollar, even shooters are snapped up greedily. Many writers have called it the best autoloading rifle.