In re-reading this thread, one thing becomes very apparent. The 223 is not too picky as to preference on powder(s).
Over the years, my load development usually ends when I identify an accurate load, which meets the velocity requirements for the particular task at hand (punching paper in competition years ago or more recently hunting a particular critter). Usually accuracy standard is moa, sometimes less, but have been known to sacrifice a bit of accuracy in favor of terminal energy (depending upon the size of the target and how close I anticipate being to said target.
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As stated previously, my pet powder for the 223 (in the several AR and bolt guns in which I have tested) is H335*. This load meets both accuracy and terminal energy (coyotes to 300/hogs to 100)requirements above out to 300 yards. Note: This load exceeds max. in most books but has not shown any pressure signs in those rifles in which I have tested. Start low and work up!
As an example of another hunting load development, I have a very accurate (5/8 moa) load for my pet .338 WM* w/210 NP and 200 NAB which prints same POI and am very fortunate that it is hard hitting and very accurate both. This was an annual zero check with the two different bullets. (Had previously sighted rifle an inch high at 100, wanted 100 yd zero, so made sight change after shot #1) Near max. load, start low & work up)
I am currently in the process of choosing a load for this rifle, using 265gr Nosler ABLR or 300gr Swift A-Frames, hopefully to be used to harvest an eland cow.
The intention is to pick the hardest hitting load possible, as the eland cow can weigh up to 1200#. Since I expect to be able to get within 200 yards, hopefully closer yet, and the eland's heart is the size of a football, I am willing to sacrifice a bit of accuracy in order to obtain velocity. Hopefully this old Savage is not picky w/the heavier bullets.
* In regards to H335 (and other ball powder) and loading for large capacity (magnum) cartridges brings up a couple of questions, often discussed on the net that I have been unable to confirm (or deny for that matter) to my satisfaction.
1) It is often stated that magnum primers are necessary to reliably ignite both ball powders and/or large powder charges.
I seldom use magnum primers (one exception is 375 h&h) and have had no ignition/accuracy problems that I have been able to identify.
2) Another claim that is widespread on the net is "temperature sensitivity" of many different powders and wonder if this may be a somewhat overworked attribute. I never let my ammo sit in direct sun or leave in a closed up vehicle and it may be due to the fact that the temperature hardly ever gets below freezing (it does, however often reach triple digits) here, but I've yet to identify problems from temperature sensitivity.
Very interesting thread. Perhaps I am too easily satisfied (or maybe just plain lazy)during load development, but once a satisfactory load is discovered, I'm happy
. Any thoughts on primers/heat sensitivity?
Regards,
hm