223 loading problem
- Thread starter Valpine
- Start date
Reduce the charge.
Doesn't sound like an issue then. Some firing pins have more clearance in the bolt than others. Look at how flattened the outside edge of the primer is for keeping a check on pressure.
Have you used the same primers on a different, safe load? Did they crater?
Failing that do you get craters on factory primers? Cratering is not always an issue and can be down to poor firing pin fit. My hornet does it with all ammo and rem700s are noted for it
Well noted '25 Sharpshooter'.. I had just this same problem(?) with the relatively soft-cupped Fed 205 GM primers I use/used in my .223 loads ... again in a Rem 700 action! But even well before this kind of information exchange site was available, I reasoned that the clearances in the bolt face round the firing pin protuberance would most likely be the culprit as my initial loads in that rifle were more than a little gentle in deference to my (then) neophyte skill levels and understandings. I changed primer to the harder and perhaps even a little thicker cupped CCI BR2 and with my then light loads this cratering of fired primers more or less disappeared. So I went back to the Federal Match primers for all but my stiff, long range loads.
As mentioned, for primer checking, whether the edges are still slightly rounded over after firing or if they are sharp and flat might be a better "high pressure" indicator..
Actually this indicator too is compromised by the construction materials and general cup thicknesses of the primers used !...
ATB ....... and shoot safely
Sonicdmb73
Well-Known Member
That is definitely a sign as is clean shiny bits on the brass.
Personally I think the best way to tell is check the speed. Chronographs are cheap enough now that you can add one to your kit.
Real world it’s usually not possible to make the data speeds. But if you’re getting close you are also getting near with the pressure too.
Landy Dave
Active Member
The normal vit powder for 223 is N133 isn't N120 a bit quick?
Sonicdmb73
Well-Known Member
Vihtavuori list it for 40 to 55 grain bullets. Maybe not the ideal powder for the heavier ones but still useable.
Just to complicate matters, bolt lift can vary a lot depending on bolt lug & cocking cam lubrication. A dry bolt can exhibit heavy drag & galling can occur. Even different oil or grease in these areas give different bolt lift loads.
Ian
Ian
Landy Dave
Active Member
Yes I use it for 45 - 52 gr and also in my 6ppc under 70grainers
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