The answer to your question is YES. Either will work fine. If your truly interested in precision long distance shooting and you want the help of a ballistic program, using standard default sea level values is going to be very inaccurate. That is of course unless your shooting at sea level and that is the current BP.
You need a weather meter
capable of reading the correct BP at your current location. I use the Krestel 4000 hand held weather station. It gives me Altitude, BP and temp as well as many other readings I'll never use. Inputting all of the correct info into your program will get you much closure at longer ranges. 29.53 or 29.92 is splitting hairs and will have very little change at 1000 yards + or – two inches or so.
Hope it helps
[ 11-16-2004: Message edited by: Jeff In TX ]