I have been shooting HBR for years. It's a blast. Others have mentioned some of the rules but also some things that are not rules. HBR is not group shooting. The target is a bullseye with scoring rings. Each target has 5 bullseyes for score and the right lower on as a sighter. The shooter has 7 minutes to fire one shot for score in each of the 5 targets and as many sighters as needed. Matches consist of 25 shots for record on 5 target sheets at 100 yards, and the same course of fire at 200 yards. Some matches also go to 300 yards where there are 2 bulls eyes, the top for score and the bottom for sighters. Five shots are fired into the top one for score and group size in irrelevant. Page 240 of the latest Sinclair Catalog has a picture of the targets. Rifles and scopes can weigh no more than 10#. Actions must have an opening in the bottom for a magazine, but do not have to have a working mag. Maximum caliber is 30. The case must have at least the capacity of the 30-30 Win case. Scopes must be 6 power or less and varables must be set to 6 or less power. Wind flags are allowed and quite common. The forend of the stock can be no wider than 2.25" but may be flat. Firing is off the bench with front machine rests and rear bags. Common cases are the 30/47mm, the 308, a 30-30 with the rim turned down to fit a 308 bolt face, and some shoot the 7/08. The 6.5 CM necked up would be legal as would a 300 Savage. The 30 BR, as well as any other BR or PPC case has insufficient case capacity. A 6.5X47 would be legal but gives away a lot of size on the target to a 7.62 hole, as would the 6.5 CM. Most shooters use light for cal bullets in the 110-140 gr range. Custom bullets are popular but match grade bullets are also used. Most rifles have a 1:12 to a 1;14 twist. Most chambers are minimum spec with tight necks. Case prep is similar to formal group benchrest prep. Fixed 6 power scopes with adjustable objectives and target type turrets are preferred as their light weight can result in heavier and stiffer barrels. Weaver T6's and Burris 6 powers are the most common, but there are others. Custom actions or trued Remington 700's are by far the most common, and custom barrels on the stiff side. McMillan HBR stocks are very common but there are others. Kevlar or fiberglass due to the light weight are almost universal. Shooters want the most accurate, and light recoiling set up they can get. A big match will have many shooters shooting a clean 100 yard stage with a high X count, say more than 15. In good conditions there may be a clean score at 200 but with a lower X count. When you see how small the 10 ring is you will appreciate how challenging this is with only a 6 power scope and 10 # rifle. The 100 yd 10 ring is 0.5" and 200 yd is 1.0". Our matches also allow non legal varmet rifles, with any cal of 30 or less, and scopes at 6 power or less. These rifles are usually competitive with all but the best HBR shooters. I would encourage anyone interested to start with informal matches using the HBR targets, and if it catches on those who want to compete formally and on a regional or national level can build a HBR legal rifle.