25 record shots at 50 yards/50 meters in 30 minutes, from the bench at one target, on an open air range.

A regular match contests three classes: Sporter Class, 10.5 Lb. Class, and 13.5 Lb. Class. A competitor can compete only one time in each class.

EQUIPMENT
The legality of any method, device, or equipment not addressed in these rules will be determined by USRA-IR50/50.
RIFLE
.22 Rimfire - no magnums
AMMUNITION
Ammunition must be a lead projectile produced by a factory manufacturing a minimum of 1,000,000 rounds a year. Competitors using hand loaded ammunition, and/or ammunition produced with jacketed bullets will be permanently disqualified. Shaving, re-swaging, and/or re-sizing, either bullets or cartridge case is not allowed.
WIND FLAGS
Wind flags can be utilized. Flags shall be no higher than line of sight from bench top to bottom of target. Wind flags may be changed when targets are changed and the range has been declared safe by the Rangemaster. No competitor can be forced to change legally set wind flags. The time allowed to change wind flags shall not be less than the time required to change the targets and no longer than the time allowed by the Rangemaster. If a flag interferes with a shooter's line of sight, the Rangemaster or representative will lay the flag on the ground. This must be done before commence fire. Any type of string line flag system will not be allowed.
SAND BAGS
Front rest must be topped with some form of sand bag. Rear rest must be a sand bag with no adjustable or mechanical means. Sand bags must be made of leather and/or cloth. The front and rear rests will not be connected to each other, the bench or the gun. Only sand bag can touch sides and bottom of stock. When rifle is raised straight up, the front and/or rear rest must not rise up with rifle. If the front and/or rear rest rise up with rifle, the front and/or rear rest must be weighed with rifle to determine eligibility. Front and/or rear rifle rest can not restrain the recoil of rifle. Front and rear rifle rest must be placed directly on top of the bench with the following exceptions. Spacers may be placed under the rear rest to attain elevation. A coin, disk, bearing, or similar device may be placed under the legs of the front rest.
Nothing can be attached to the bench that would impede the movement of the front or rear rifle rests.
TARGET
Official USRA-IR50/50 TARGET must be used. Targets are to be taken down by target crew and given directly to scorer. Targets must be hung with sighter targets at the top.

CLASSES
13.5 LB
Unlimited scope power. Gun and scope must weigh 13.50000 lbs. or under. Stock must be 3" or under at its widest point. Barrel, action, or sleeve can be bedded. Bedding can be by glue-in or bolt in. Gun must be designed to be shoulder fired. The bottom of the butt of stock that comes in contact with rear sandbag must be either convex or flat. If flat, the bottom of the butt of stock must be 1" or under in width. The bottom of the forearm must be either convex or flat, except for position style stocks with a hand stop slide. Adding small rails or reshaping the stock to form a mini-rail system is not allowed. No electronic or mechanically assisted triggers allowed.
10.5 LB
Same rules as 13.5 class. Gun and scope must weigh 10.50000 lbs. or under.
SPORTER
Rifle and scope must weigh 7.50 lbs. or under. Scope must be 6.5 power or under. Variable scopes must be set at the legal power and taped by referee. Rifle must be a repeater and hold 2 or more rounds in a removable clip/magazine except for tubular fed rifles. The clip/magazine must be capable of feeding two or more rounds into the chamber and must be installed in the clip/magazine housing when competing and when rifle is weighed. Rifle must have a working safety. Stock must be made of wood and must be designed to be shoulder fired. Laminate wood is allowed and the action area may contain bedding material. The action may be glued into the stock. Proof that the stock is made of wood is the competitors responsibility and must be accomplished to the satisfaction of the referees when requested. Visible wood grain over the entire surface of the stock shall constitute proof.
Stock must be 2.25" or under at its widest point. No stock tape allowed. Any area of the stock that comes in contact with front and rear sandbags must be convex.  Convex will be determined by placing a penny on the stock where convex shaping is required. The outer edges of the penny can not come in contact with the stock in the dimension being measured (see picture below). There must be visible space underneath the outer edges of the penny. If the outer edges of the penny exceed the width of the dimension in question the area must be clearly convex to the referees. The underside of the forend that contacts the sandbag must be convex across the entire width.
Minimum length from the trigger to the end of stock, excluding butt pad, must be 12.5". No vibration devices allowed. Barrel must be made out of one piece of metal with no attachments except for the action and a nut to secure the barrel to the action. Sights are only allowed on factory barrels. No electronic or remotely actuated triggers.

Follow this link:  http://www.ir5050.com/rules

Match Fees: Members $5 / Target , Non - Members $7 / Target,  Juniors (under 18) for SOTY Matches $2 / Target, Regional & State  $10 / Target, Juniors (under 18) $ 4 / Target.