from Steve's Pages:

https://stevespages.com/224_8_60.html

63 grainer, ( Sierra SMP)... 23 to 26.5 of Reloader 15...this is for the 223.

I can tell ya from experience in my bolt action 223s, if you want the max punch with that bullet, there is no problem upping the charge up to 28 grains in my rifles...brass or rifle never noticed the difference...

If it is NOT hot weather or high temps...take a look at the charge for W 748 down below that...I've used that for both the Sierra 63 SMP and the Speer SMP 70 grain...give the candidate a real hard punch....

for the 22.250:

https://stevespages.com/224_7_63.html

also look at W 748 here also... both bullets will stabilize in a one in 14 twist, so 1 in 12 or 1 in 10 will present NO problems stabilizing... with any powder..

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez