Originally Posted By: reb8600Originally Posted By: obaroI am in the same process, but using 25 grain bullets and CFE223. So far the best info I have got is from searching forums, and also using the Hodgdon website info for the 17 Remington as kind of a 'cross reference'. Hope this helps you out.
If you are using Hodgdons website, why are you using 17 Remington data. They have data for the 17-223
17 Rem and 17-223 are very close in case capacity but their pmax specs are way different. 17 Rem has a pmax of 61,641 psi and 17-223 has a pmax of only 53,664 psi. It may have something to do with all of the different makers of 223 brass or with the measuring method. QL for 17 Rem uses Piezo CIP and for 17-223 uses what is called a Wildcat method.
If I was loading a 17-223 I would use Lapua, Norma, LC or Nosler brass and use 17 Rem load data with a CHRONOGRAPH. Velocity = Pressure. There is no free lunch. Pressure signs on brass show up after you are way over pressured. I use a Oehler 43 PBL which measures pressure and I have seen this time and time again with no exceptions. On the top end, with smaller case capacities pressures can spike with minimal powder increase. This is why I like to try and get load densities around 100% even if velocities are a little low.