Here is an edited version of the rules for Smallbore Rifle Silhouette competition. These are not the "Official" NRA rules. But enough to give someone new an idea as to what the rules are.
All Smallbore rifles are standard 22 rimfires, Short, Long & Long Rifle. Hyper velocity rounds above 1,300 fps are NOT allowed.
Most people shoot the Sub-Sonic match ammunition in the range of 1,050 fps to 1,080 fps.
STANDARD
RIFLES: (Target style rifles)
Maximum
Weight:
10 pounds, 2 ounces, including sights & anything to be used in
competition (scope shade, clip, etc.).
Sights:
Any sights, telescopic or metallic may be used. Scopes may not be more
than 2 inches above
Trigger:
Any Trigger
not subject to accidental discharge. About 2 to 4 ounces is the
minimum you would want to have.
Stock: The stock must be traditionally styled and may not be bent and/or twisted so as to deviate from conventional configurations such as factory rifle stocks or silhouette stocks as manufactured by Fajen, McMillan, H-S Precision, and others. The forend, including the trigger guard mounts and screws, shall not exceed 2.25 inches wide, and 2.25 inches deep measured from the centerline of the bore. Magazines do not have to conform to stock measurements but those that extend below the stock line may not be used as support. The forend shall extend a minimum of 8 inches forward of the forward edge of the receiver ring. The comb shall not extend above the centerline of the bore, but Monte Carlo roll may rise 0.5 inch on the off side. The toe of the stock including buttplate or recoil pad shall be no more than 7 inches below the centerline of the bore. Buttplate or recoil pad may not extend below the lower line of the stock.
Trigger Guard: A standard trigger guard must be present .
Barrel: The barrel may be no longer than 30 inches including any sleeve or attachment, as measured from the face of the closed bolt to the end of the barrel.
HUNTING RIFLES:
Maximum Weight: 8 pounds, 8 ounces, including sights & anything legally used in competition (scope shade, clip, etc.).
Sights:
Any telescopic or metallic sight may be used. Scopes may not be more than
1.5 inches above the rifle, as measured from the top of the receiver to
the underside of the scope tube, nor may the scope be offset from the
centerline of the bore (except for lever action rifles that eject cartridges
straight up and normally use an offset scope).
Stock: A hunting style stock. Attachments, either removable or permanent, are not allowed.
Rifle
Slings: NOT allowed, They can be on the rifle but not used in firing.
Trigger:
Trigger pull shall not be less than 2 pounds. The safeties must be functional
Barrel:
A hunting style tapered barrel. Heavy "Bull" or "Varmint"
barrels are not permitted. A factory tuner that does not act as a muzzle
break is permitted. Maximum barrel length is 26 inches.
Magazines:
Magazines may not be loaded with more than 5 rounds. During the match, all
cartridges must be loaded into the chamber from the magazine. Magazines
not capable of holding 5 rounds may be reloaded as required, or for
removable magazines/clips, multiple magazines may be used.
During
a Shoot-Off
(tiebreaker): Single cartridge loading may be used, at the direction
of the range Officer.
MORE TECHNICAL DESCRIPTIONS................ Here are some more technical descriptions from the rulebook that describe equipment and clothing.
Spotting
Scope -The use by the coach of a telescope or other optical device to spot
shots is permitted.
Clothing
-Commercial type trap and skeet vests (sleeveless ) and shotgun shooting
shirts are permitted as well as clothing normally suitable for existing
climatic temperatures. Shooting coats, unnecessarily heavy clothing, or
anything on the person that would provide artificial support such as
clothing having excess padding or stiffening material or which restricts
or supports the body in the shooting position may not be worn. Any dispute
regarding clothing will be submitted to the Jury for decision.
Sleeveless
leather, vinyl, heavy fabric or multiple layered vests that may be
considered or construed to be unnecessarily heavy or to provide artificial
support are permitted if they can be closed over a gauge made from 4 inch
thin wall PVC pipe, not less than 30 inches in length, passed through the
entire length of the vest, and opened or vented from the bottom edge to a
point two inches above the crest of the hipbone.
Palm
Rest -A palm rest may not be used. A palm rest is any attachment or
extension below the forearm which aids the normal hand grip and support of
the rifle by the forward hand/arm.
Buttplates
and Cheekpieces -A butt or buttplate having a curved rear surface in which
the depth of the curve exceeds 1f2 inch when measured from a straight line
drawn from the top to the bottom of the buttplate is prohibited.
Buttplates must be centered. Adjustable cheekpieces must be fixed and
sealed in place.
Release
triggers -triggers which function on release are prohibited.
Compensators
and Muzzle Brakes -The use of compensators, muzzle brakes and
Open
Bolt Indicators -An Open Bolt Indicator is required in all NRA Silhouette
competition to indicate the bolt is open.
Eye
Protection -All competitors and other personnel in the immediate vicinity
of the range complex are urged to wear eye protection devices.
Ear Protection -All competitors and other personnel in the immediate vicinity of the range complex are urged to wear hearing protection devices.
HOME ........... RANGE RULES ........... RIFLE RULES
CLASSIFICATIONS, SCORING & AWARDS .......... TECHNIQUES 1
TECHNIQUES 2 .......... TARGETS1 ..... TARGETS2
TESTING & MOUNTS .......... MY WIFE AND I ...... MY SHOOTING HISTORY
SILHOUETTE HISTORY .........SCOPE ADJUSTMENTS AND BALLISTICS
CLEANING ........ CUSTOM ENGRAVING