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222rem at 223 pressure limits
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I wonder if a lot of 222s are reloaded for at the higher 223 pressure limit? If you worked a 222rem up sensibly you would presumably arrive at pressure signs at the same pressure level as a 223?(55kpsi instead of 50kpsi)

Currently I am gently moving up past the Hornady book max for 40gr Vmaxes (19.6gr VVN120 for 3,500fps ) and have left off at 20.9gr where at last there is the faintest change in primer shape after firing. I am now at about 3,600fps over book but with the same accuracy.

Nosler list the max for their 40gr ballistic tip as 21.5gr VVN120 (which seems a big differences even allowing for differences in construction)Their velocity value at 3564fps is not representative coming as it does from a 20" barrel.

Are there subtle differences in the way that small cases such as 222 acheive their pressures ? I am thinking that perhaps the duration of the pressure peak is so short that pressure signs are only shown at much higher achieved pressures?

The intention is not for a super barrel burning hot rod 222 achieving 223 velocities, it's just that I have a noticably flatter 222 and I wonder if I'm just lucky or am pushing the envelope unwisely.

PS is the BC of the vmax very pessimistic, seems to be or JB ballistics is out a fair bit.
 
Posts: 2258 | Location: Bristol, England | Registered: 24 April 2001Reply With Quote
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1894,

This may interest you.

I use my Rem. 40XBR 222, with 24" barrel, for PD shooting. My generous load of VVN130, with Nosler 40 BT's(moly-plated) and Fed 205M primers, gives 3780fps(Oheler 35P).
Please note that I have installed a 32 pound Wolff firing pin spring, in order to help control primer cratering.

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Kevin Gullette
 
Posts: 414 | Location: The Republic Of Texas, USA | Registered: 28 December 2000Reply With Quote
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The lower industry pressure standard for the .222 as compared to the .223 (and .222 Magnum) is one of those continuing misteries of life. It probably has something to do with the .222's origins as a civilian round and some of the actions in which it was chambered early on, as opposed to the other two rounds which were developed as military chamberings.

As you've discovered, there's absolutely no reason not to load the .222 to .223 pressure levels (in an appropriate action). Of course the reloader must be cognizant that with the very small case, pressures can rise rapidly with relatively small adjustments of powder. So long as you work judiciously, your .222 will digest these higher-than-standard pressures without complaint.
 
Posts: 13266 | Location: Henly, TX, USA | Registered: 04 April 2001Reply With Quote
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