Honestly? Base to tips mid August. I feel and have studied that circumfrences, mass, and density come in play layer ? That's the hidden secret. Circumfrences/mass is fullfilled all the way to a few days before the velvet dries and begins to loosten. Density? Also a form of weight. I am a firm believer that a buck's internal antler density is not complete till the hormones kick in about early October. That's my study. Take it how you like it. I have studied all forms of antler growth and the strongest heaviest filled out finalized package is early october. Nice and polished up too.
Had to go at the sportin goods store. There was pee all over seat. Cleaned it with wad of TP. Applied TP for protection from nasty seat. Turned to sit down. The sensor flushed and the powerful vaccume force inhaled my TP. Not fun.