XTC is the Across the Course High Power - Open sight service rifles. Strings of fire range from 200 yds to 600 yds rapid and slow from offhand to prone. X ring at the 600 yd line is only 6". Anyone can attend. Cost to attend is usually minimal.
This type of competition is more in line with building your expertise as an outstanding rifleman. It is not a competition for those who prefer more fast action adrenaline style competitions.