IMR4198 is all I’ve used in 223 and 222, since about 1982.
While my 223 load of under 21 grains is likely considered mild with a 55 gr SP......it has never failed to cycle in any carbine, mid-length, or rifle-length AR of mine.
Burns cleaner than most.
Groups just fine with 223 bolt rifles too, heavy or sporter weight barrels. Even my little M7 stainless/synthetic shoots great!
222 with 52 Hornady BTHP and 4198 works just fine.
The metering issue is a little overblown.
Used a few 8 lb’ers over the years.
Yea......give it a try and let us know. Couldn’t hurt to try.....
