Alright, long story short, Holorifle is really getting on my nerves. The pump action gun really makes me a sad panda and gives me a hard time when I'm trying to mow down Legionaries. So is there a really good gun. It can be any energy rifle or regular rifle. So long as it's a rifle and not a giant behemoth of a gun.

Anti Material Rifle....1 shotting everything is surprisingly effective

All-american.

Automatic Rifle.
12.7 SMG.
Light Machine Gun

12.7mm SMG
LMG
This Machine
AMR
.45 Auto Submachine gun
ALSiD
All American
Assault Carbine
YCS/186
LAER
Survivalist's Rifle

LMG with large mag. its fun spraying 200 rounds of 5.56 into many recently deceased corpses.

This.

What everyone said in addition to:

Q-35
Trail carbine
Lucky
Mercy
CZ57 Avenger

Assault carbine

I would say Survivalist Rifle, its what I'm taking into Lonesome Road with me as my top weapon and its the gun that got me through OWB too.

Try out the 12.7mm pistol or the Hunting Revolver. It's a nice change of pace.

This Machine or the Hunting Revolver.

Damn, I can't imagine putting down my holorifle. then again I like the pump action, it's like a scoped Sniper Shotgun. Powerful too. But if you're looking for something else:

All American
AMR
12.7 SMG
Laser RCW

Just a few suggestions.