Actually, the Ruger #1 is not a "break action" but a "falling block" or "drop action".

The difference is that a break action has a hinge pin allowing the barrel to break open to expose the breech. If the hinge mechanism becomes loose on a break action it affects rigidity of the barrel/stock unit.

On the Ruger and on similar falling block designs such as the TC Omega and my favorite cartridge rifles - the Browning single shots, the barrel/stock is always a rigid unit. (I have a Browning B-78 in 25-06 and an 1885 in 45-70 - both tack drivers).