As stated before. If you fail chrono in single stack and your power changes to minor, you can now load to 10 if it fits in your mags. Appendix D5 reads: "9 Maximum ammunition capacity Yes, maximum rounds loaded in any magazine after the start signal. • Major Power Factor - 8 rounds • Minor Power Factor - 10 rounds" Note there is -no- language regarding declaration of power factor. Contrast this to Appendix D6 for revolver. "9 Maximum ammunition capacity No, maximum of 6 rounds fired before reload if Major PF declared, 8 if minor PF declared." Note the -inclusion- the term declared. By comparing these two divisions we can see that single stack rules only refer to your power factor, not your original declared one power factor. After chrono, your power factor can change. There is no support in the rules for a power factor change. Under the rules of single stack or revo divisions major and minor get differing amounts of ammunition. If you load more, you no longer meet division requirements and you are bumped to open under rule 126.96.36.199.