Interesting. I have some local mills who cut the loblolly and air-dry it (or I buy it green) and it usually dries straight without much checking, and it dries fast. (I think they say 90 days for 1-inch stuff and you 're good to go.) I like it, though not as much as the longleaf. I guess the longleaf grows slower, making it more expensive / less profitable for the growers...?
House is 130 yrs old and (I believe) all old-growth loblolly...the newel post probably has 80 visible (very thin) rings and no pith...must have been a huge tree. Even though I believe the entire house is loblolly, some of it is harder than the hammers of He|| (like longleaf) after all these years...