I have a 20 gauge and lightfields shoot exellent through it but by far the best slug is the new hornady sst slugs. are you shooting sabot or rifled slugs?
hornady sst slugs




20 Gauge 250 gr. SST Slug
[align=right]86232[/align]





Velocity (fps) / Energy (ft-lbs)

Muzzle
50 yd
100 yd
150 yd
200 yd

1800/1798
1628/1471
1470/1200
1331/983
1212/815





Trajectory (inches)

Muzzle
50 yd
100 yd
150 yd
200 yd

-1.5
2.5
3.3
0.0
-8.2
lightfield slugs








20 Gauge Lightfield Hybred EXP Ballistics Data







Range
(yards)


Velocity
(feet/second)

Energy
(foot·pounds)

Drop
(inches)

Flight Time
(seconds)






0


1502

1929

-------

--------






25


1371

1607

+0.83

.05229






*50


1257

1351

+2.01

.10948






75


1162

1155

+1.81

.17161






*100


1088

1012

+0.00

.23839






125


1030

907.4

-3.62

.30930






150


983

826.9

-9.25

.38387