I would also multiply the resistors by 10, and reduce the capacitor by 10. This will reduce the power dissipation in the resistors and inside the 555. I prefer not to use such low value resistors when setting the time constants in the 555.
Also, be advised that you cannot ever get a 50% duty cycle with the configuration you showed in the link. The timing capacitor charges through R1+R2, but discharges through only R2, making it impossible to get equal charge and discharge times. There is another way to get that, if you really need a 50% duty cycle.