"...don't ship powder..." Hazmat shipping fees are high. Go to your regular AA powder supplier and ask if they can get it. If their distributor has it in stock, they should be able to order whatever you want.
"...Like to try to get 4 lbs...." You have a load worked up already? If not, but one pound first and work up a load. Despite Accurate's marketing, your rifle may or may not like it.