It took a bit of planning, but we managed it...Both Big QC and I hit new milestones at the same cache. I started the day on 3992 and she started with 1485. We did a few drive bys that I knew she hadn't logged but I had, then we hit a new small trail which took us both to xx99 caches. One further cache (a puzzle cache) took us to 1500 and 4000 caches.
Big QC was delighted with her new number.