how do you score a blackbuck

For what TGR ? ROE or SCI ?

whats the difference

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Here's the Records of Exotics instructions for their method:

THREE MEASUREMENTS PER SIDE
This is a multi-animal scoring method that is primarily used on single horn sheep
or goat-type animals with some exceptions. Specific animals include: AOUDAD
(or BARBARY SHEEP), ARMENIAN SHEEP, BLACKBUCK ANTELOPE, CATALINA
GOAT, CORSICAN SHEEP, HAWAIIAN BLACK SHEEP, IBEX, MERINO
SHEEP, PURE MOUFLON SHEEP, MOUFLON TYPE SHEEP, RED SHEEP, TEXAS
DALL SHEEP, TUR, and YAK. If a specie has several subspecies, the same scoring
method is utilized for all. The score is determined by taking three measurements
on each horn. The sum of all measurements is the score. No drying period is
required.
The length of the horn is measured by placing the end of the tape where the
horn meets the skull on the top side of the horn. The tape should be held on the
center (ridge) of the horn throughout the measurement. The tape should be
wrapped snug around the horn from the base to the tip with no slack. The length
is entered on the appropriate line for both the right and left horns.
The circumference at base measurement is taken around the horn on the hair
line with the tape pulled snugly against the horn. Each measurement is entered
on the appropriate line for both the right and left horns.
The circumference at 1/2 length measurements are taken at 1/2 of the length of
the LONGEST horn. For example, if the right horn is 28 2/8 inches long and the
left is 26 0/8 inches, then both the right and left mid-horn circumference
measurements should be taken at 14 1/8 inches from the base. Once again, care
should be exercised to insure that the tape forms a perfect circle around the
horn and is snugly against it with no slack. It is not permissible to move the tape
either way to take advantage of a larger measurement resulting from a ridge of
the horn. Each measurement is entered on the appropriate line for both the right
and left horns.
Columns are sub-totaled at the bottom and the two sub-totals are added
together for the grand total. Remember to convert the numerals leaving a
fraction less than 8/8 and check your addition to make sure it is correct. Be sure
to include a photograph with the entry.
MOUFLON SPECIAL NOTE** For all entries in the MOUFLON PURE or MOUFLON
TYPE categories, photographs of the animal are required. A photo should be
taken from an angle that will show the horns from the front. Either category
requires that the widest total width of the horns NOT be the tip-to-tip distance.
For an entry into the MOUFLON PURE category, the animal must have the
mouflon horns and the distinct mouflon coloration of a white saddle patch on its
back, white belly, and black mane. This should also be documented in the photo.
The MOUFLON TYPE category does not require the distinct coloration and any
entries not documenting the proper coloration will be entered as MOUFLON
TYPE.
BLACKBUCK SPECIAL NOTE** On taking the length of horn measurement on a
blackbuck, the tip of the tape measure is placed where the horn meets the skull.
The tape is then extended until the tip of the horn is encountered. The tape does
not follow the twists of the horns as it would when measuring a Catalina, but
does flow in and out of the twists and is not a straight line measurement (see
diagram). The circumference at base measurements are taken around the horn
at the hair line. It is not permissible to back away from the hair line to take
advantage of a larger measurement resulting from a ridge of the horn.