Crazy for using Sch. 40?!?! Go somewhere else. Class 200 pipe is commonly used for irrigation systems in the south. It is rated for 200 psi and can withstand a 400 psi hammer. We use thousands of feet a week. It is cheaper than shc 40 and does carry more water because the ID is larger, BUT it is also 'thinwall." Th actual thickness of sch. 40 is much more rigid. In Louisiana our frost line or whatever you call it...well he77 I doubt we even have one here, is irrelevant. If the ground freezes up there, you need a thicker wall pipe. However i don't care what you put in the ground, if it is within your freeze zone, whatever, it will still crack and freeze. Even galvanized pipe. Even down here, galvanized pipe above ground will freeze on rare occasion.
Whether it has belled ends depends on the manufacturer. Check it first. Oh make sure to use a purple primer and good glue. AND only use it during the temps listed on the can. They will affect the holding strength.