Originally Posted by keith
everyone needs at least half a dozen rifles in this caliber, long barrel life, ungodly accuracy, quick to find an accuracy node with most powders.

H335, AA2230, Benchmark, H322, N133, N135 all are surpurb.

H335 and AA2230 will give you very long barrel life, and that is no schitt!

If you will have Greg Tannel(Gre-Tan Rifles) bush your firing pin, you will not believe the good stuff that follows!

While the .223 being SAAMI registered at 55 kpsi seems like overkill on safety margin to advanced handloaders, the .223 case head will fail before the primer will pierce even with factory firing pin fit.

You may be thinking of 6mmBR case heads, the the primer will pierce in a work up, while the case head remains solid.

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Work up with 33 gr Vmax in 223 with Blue dot in Ruger #1
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33 gr Vmax in 223 with Blue Dot in AR15
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55 gr Vmax in 223 H335 in Ruger #1
unfired, extractor groove .329"
28 gr, extractor groove .329", 11% overload 69 kpsi Quickload
29 gr, extractor groove .329", 15% overload 80kpsi QL
30 gr, extractor groove .3295", 19% overload 92kpsi QL
31 gr, extractor groove .3320", 23% overload 106kpsi QL
As you can see the case head starts failing at 30 gr and the primer has not pierced with 31 gr.

The 6mmBR, OTOH, benefits greatly from Gre Tan bushing the firing pin.
6mmBR 65 gr Vmax 36 gr H335, primer will pierce, case head ok
6mmBR 75 gr Vmax 33.5 gr H335, primer will pierce, case head ok


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