Reload system config to get last saved values

Question

When I save new value of a custom option in system config that new value is not available in the same request. For example, somewhere at the beginning of a controller action in a custom module I save the new value:

Mage::getConfig()->saveConfig('some/custom/option1', 'ABC');

And then at the end of that action when I try to get the value of this option from config:

$newValue = Mage::getStoreConfig('some/custom/option1');

it doesn't return ABC but the old value of this option. I understand it gets this old value from cached config.

Question: Is there a way to programmatically refresh/reload the system config to get the real last saved values from system config?