Buckshot comes in many sizes:

SizeTypeWeightDiameter#TriBall(12 Ga.)Buck20.41 g (315 gr.)15.24 mm (0.60")#0000Buck5.51 g (85 gr.)9.40 mm (0.380")#000Buck4.54 g (70 gr.)9.14 mm (0.360")#00Buck3.49 g (53.8 gr.)8.38 mm (0.330")#0Buck3.18 g (49 gr.)8.13 mm (0.320")#1Buck2.62 g (40.5 gr.)7.62 mm (0.300")#2Buck1.91 g (29.4 gr.)6.86 mm (0.270")#3Buck1.52 g (23.4 gr.)6.35 mm (0.250")#4Buck1.34 g (20.7 gr.)6.09 mm (0.240")#FFBuck1.18 g (18.2 gr.)5.84 mm (0.230")#F (TTT)Buck1.05 g (16.2 gr.)5.59 mm (0.220")#TTBuck0.98 g (15.1 gr.)5.33 mm (0.210")#TBuck0.89 g (13.7 gr.)5.08 mm (0.200")#BBB

0.66 g (10.2 gr.)4.82 mm (0.190")#BB

0.57 g (8.8 gr.)4.57 mm (0.180")#B

0.48 g (7.4 gr.)4.32 mm (0.170")

120 gr = 7.77588 g

120 gr = 7.77588 g

120 gr = 7.77588 g

120 gr = 7.77588 g

120 gr = 7.77588 g

120 gr = 7.77588 g

you have to use this code: gr-gr-ry-yb-bo-o-o-o-b-y-r-g-r-g-yb-ry-gyo-gyb-ryo-ro-gy-grb-gry-gr-gr-g-go-gr-gy-gyo-b-gy-gy-gr-gr-

Go to options -> cheats -> enter: (hold the note and strum)

RY, GR, GR, RY, RY, GR, RY, RY, GR, GR, RY, RY, GR, RY, RB = Unlock All Songs

GR, B, GR, GY, BGY, RY, O, RY, GY, Y, GY = No Fail

YO, YO, YO, YO, YO, RY, RY, RY, RY, RB, RB, RB, RB, RB, YB, YO, YO = Hyperspeed

RY, RB, RB, RY, RY, YB, YB, YB, RB, RY, RB, RB, RY, RY, YB, YB, YB, RB = Precision Mode

GR, GR, RO, RB, GR, GR, RO, RB = Performance Mode

G, R, G, Y, G, B, G, O, G, B, G, Y, G, R, G, GR, RY, GR, YB, GR, BO, GR, YB, GR, RY, GR, GY = Large Gems

RY, GR, RY two times, RB five times, YB two times, YO. = Air Guitar

To convert grains to grams, multiply by 0.06479891. So in 30 gr, there are 30x0.06479891=1.9 g