Annealing at the Lower End of the Range

Annealing can be done at other than the defined glass transition temperature - also known as the annealing point. Annealing occurs over a range rather than a single magic temperature. Bullseye did not change their glass when they altered the recommended annealing temperature.  Their research has shown that good results are obtained by annealing at the lower end of the range.  

A graph of some aspects of a specific and stiff soda lime glass illustrates this.

Annealing can be between the glass transition (annealing) point and the strain point
credit: Lehigh University

Bullseye's previous annealing temperature was 516C and Spectrum's was/is 510C. These are very close. Bullseye's research is applicable to all soda lime glasses. Therefore, the same principles can be applied to Oceanside fusing compatible glass.  It has already been applied to the Wissmach fusing lines.  This means that you can anneal both glasses at the same temperature.  If you feel the need, you can increase the 482C by 6C to 488 for both, but I don't think it is necessary.

The purpose of the annealing soak is to equalise the temperature within the glass to vary less than 5°C (i.e., +/- 2.5C).  If this is done at the lower end of the annealing range, there is less difficulty of maintaining that small difference throughout the cooling stages.