I am working on some new loads using 9mm 147gr lead and using Titegroup. It is going well and right now loading for a Sig 226 and it likes longer OAL 1.160 to 1.165. Using Lyman 49th as a starting point the last load I chronographed was 2.7gr @ 1.160 Oal (827 PF) and shoots well but is under power factor trying to obtain 125,000.
The load data in Lyman is 2.5grs to max 2.8grs and this is at OAL 1.058 which for my guns is really short. I am going to give 2.8grs a try but at 1.160 oal I don't think it will still make PF. So my question after all this is since the load data is 2.5 to 2.8 oal 1.058 I should be able to bump the max load a little using 1.160 I would think but wonder what or maybe how a max load for 1.160 is figured if possible to up max safely. Thank You