According to the rules shown below, you could shoot in the Any Sight Match Rifle/Tactical Rifle division, whatever that is. If you shoot in the F-Class F-TR division, you could use a front bipod and all shooting is prone. If you shoot the Service or Match rifle course of fire, you wouldn't be able to use a bipod for the prone stage. I've never seen anyone shoot the Service or Match rifle courses of fire with optics.
Figuring out what types of long-range shooting are available under NRA approved matches is very difficult. The NRA high power website is a mess and it's sufficiently confusing to dissuade anyone from figuring it out ... which is probably the intention of those involved.
3.3.2 NRA Any Sight Match Rifle/Tactical Rifle - Same as NRA Match Rifle Rule 3.3 except there is no
restriction as to sights. The following restrictions will apply:
(a) No person firing an any sight rifle under 3.3.2 will be allowed to compete with any other group of shooters
who are also firing. A competitor using any sight rifle under Rule 3.3.2 will only be eligible for awards in
their own division.
(b) Bipods may be attached but not utilized. Ammunition will be restricted to no larger than .35 caliber.
3.3 NRA Match Rifle - A center fire rifle with metallic sights and a magazine capable of holding not less
than 5 rounds.
(a) See Rule 3.14, Palm Rest.
(b) A service rifle may be used as a match rifle unless otherwise stated in the program. Any service rifle used
as an NRA Match Rifle shall conform to Rule 3.1 as applies to trigger pull.
(c) Semi-Automatic rifle. M-16 or commercially equivalent rifles, configured or customized as NRA Match
Rifles are exempt from the 4 1/2 pound trigger weight requirement.
(d) Any semi-automatic rifle that has an original factory design receiver/frame in excess of 3 1/4 inches below
the center line of the bore may be used as an NRA Match Rifle.
(e) Other Nations - A center fire rifle with metallic sights. This rifle must meet the requirements to be a legal
target rifle in the participant’s home country, and may only be used by someone who is a foreign national,
and can provide evidence thereof. (It would be wise for a foreign competitor to have a copy of his own
country’s rifle rule, or letter of certification from his National Association with him when competing under
this rule.)