Any tips for leveling pistol more quickly?

[Thalore]

I used a place inside the volcano on Padres. The entrance just past Romaney Bev. Go in past the first cave area into the next room. There is a lot of Grenadiers and Gypsies which arn't the greats XP but there is a ton of them, and almost no risk of getting killed.

Also don't use "Take Aim" only use the basic shot it will net more XP because of the ODD rep system.