According to the Amidon Data Book the 2 type material has a temperature co-efficient of 95 ppm. BUT copper wire expands and contracts with temperature variations. Fix it to a former, say a piece of plexiglass or similar so chances of mechanical variation by temperature affects are minimised. Other causes of oscillator drift Another leading cause is poor power supply regulation and often using too high a voltage can cause problems. Similarly trying to take power from the ocillator will contribute to oscillator drift.
Mechanical stability is another consideration.
Use rigid larger diameter wires for interconnections where necessary between components. Over the years I have seen some remarkable designs for overcoming oscillator drift, then again I have spent days trying to cure the problem also. Nothing is more frustrating when working on an oscillator connected to an accurate frequency counter, and near an open window on a fine day, watching the frequency gently go up and down in perfect harmony with the prevailing breeze as the curtains wave about like synchronised swimmers to the beat of the frequency display. At times like that, great white shark wrestling, training crocodiles or playing with the local brown snakes probably seem less demanding hobbies. Follow this check list to minimise oscillator drift.