So you need to take care also of the weather humidity and try to simulate first, and have a good test, maybe later you can share us which test or procedure was better to improve your shrinkage.
Assuming using the same mold to mold part individually with material PA66 GF50 and PA66 GF30, meaning runner/gate/cooling systems are kept same, the part's finished dimensions are still dependent on part design and process conditions. However, it's not suggested to obtain qualified dimensions by adjusting process conditions. The most direct way is (1) using the optimized process conditions of each material to mold the part individually, (2) Inspecting/recording all dimensions of part made by each material then compare them to dimension specifications one by one, and (3.1) designing exchangeable core/cavity components of mold so that they are assembled to handle significant dimension change caused by different shrinkage of PA66 50GF and PA30GF, and get all dimensions qualified. Or (3.2) If lucky enough, all finished dimensions might still be in spec and accepted without consistency concern. Then it's not necessary to design any exchangeable core/cavity component of mold.
The article comes from China injection mold manufacturer - Mold Best Assurance Company Limited, website is www.mbamoldanddesign.com
