Nick, I may be getting a little less pressure than suggested by the tables. I sized the cases just enough to make sure that they functioned properly in the gun. I know they are a little tighter in the chamber than a factory round would be. In fact the first few I did would not let the bolt lock into battery. I turned the die down just a little and resized them until they would reliably chamber and lock up the bolt. Thus I probably have a little more capacity than estimated, although I have not done the water measurement test yet. I'm going to check at my reloading supply shop (only one in my area) next week and see if they have any other small rifle primers but the last time I was in they had none. In the meantime I'm going to run some test loads of Varget through the rifle. I think it may give more consistent results with this Magtech primer. I don't have a chronograph yet (hoping Santa is bringing one). With my other calibers I usually just stay off max loadings by a grain or two and stick only to published data so I've not really worried about it too much. I'm not hung up on loading the fastest bullets possible and usually just load them hot enough to get the job done. With that being said, I intend to try and stretch this little 223 out to some fairly long ranges and wanted to get the velocity up a bit but not at the detriment of my appendages or face. I'm going to see if the Varget does any better and go from there. I'll let you know what my results are but it will be a few days before I get back to the range as it's been raining nonstop here for two days (7 inches in 48 hours) and is still pouring as I write this. Once the rain stops a cold front is coming and we are supposed to get snow. Gotta love the weather in Arkansas.
Oh and by the way. I think you are correct in your assessment of the primer cup on the Magtechs. They seem to have a pretty hard cup but I looked at hundreds of different once fired cases of various brands and everyone of them had flatter primers than my loads did. I'll get around to measuring the water capacity and give you that data in a while. Thanks for the help.
Last edited by Range Junkie; 12-24-2009 at 06:51 AM.