If you'd like to have GTA V stats for the shotgun, here's some stats I made using GTA 5's weapons.meta file (GTA 5's weapon.dat) 

Open up Weapon.dat with notepad and replace these 3 lines with mine:

$ DESERT_EAGLE	         	INSTANT_HIT	30.0 50.0	348	-1		2	pythonbad	6	 116		0.41  0.03  0.12    	0  0	0.75	 1.0 	 7 36  8     	 6 30  7  40	7021
$ DESERT_EAGLE	         	INSTANT_HIT	30.0 50.0	348	-1		2	python		6	 151 		0.41  0.03  0.12        1  200	1.0	 1.2 	 6 30  7     	 6 28  7  40	7031
$ DESERT_EAGLE	         	INSTANT_HIT	35.0 50.0	348	-1		2	python		6	 160		0.41  0.03  0.12        2  999	1.25	 1.5 	 6 28  7	 6 28  7  40	7031


These stats aren't 100% like GTA V's stats, but it's pretty close.

Have fun.