You would be generally start with about.5 grains and work up toward about 25 grains, same as with 63 grain bullets (not enough weight difference to bargain gift sets matter) but that is based on the least case water capacity, and not necessarily what you have.
If you have a rifle with the faster 1 in 7 twist, you should limit muzzle velocity of sporting-type bullets to around 2800 feet/sec.
With equivalent bullet weights, the 223 enjoys a 100 to 300 feet/sec velocity advantage.
223, d mihgtoh lS 56mm, hATO h e 223 Remington resulted from military development of a new service rifle cartridge.
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The ready supply of cases and an excellent selection of 22 caliber bullets has made the 223 one of our most popular cartridges.
T has also found wide acceptance as a police cartridge.