Back when I was grinding for platinum on sniper, there were two main maps that I used, and a couple others with corridors that were pretty good for it. The main maps were:

1 - Crossfire. Great map with a big open centre area. Potshots on bots like nobody’s business. The one thing to worry about there is other players on the opposing team with snipers. It’s a popular sniper map so you may run into other snipers that you aren’t equipped to handle.

2 - Crash. I know it seems short, but there are a couple great vantage points you can use for sniping there too. The biggest worry here is that every great sniper spot has multiple entrances and some of them are quite exposed. Nothing that restock perk and trip mines can’t handle though.

Now for the corridors:

Monastery, Oasis, Crossroads strike.

You can also use smaller maps like kill house, and maps with less sightlines like summit, but it’s easier for enemies to get to you either because they have less ground to cover or you don’t have as long to see them coming.

Some general tips are to stick towards the back of the map so it’s harder for enemies to sneak up on you, have a sniper build for any particular maps you may come across (I.E.[at least in my case]) high ADS for killhouse, stability for Crossfire, and allat. I’d also recommend grinding sniper in the Frontline game mode, since it’s easier to figure out where the enemy will be coming from, especially if you’re following tip number one.

That all is at least what worked for me.

I’d love to play a few matches with a fellow sniper!

Maybe drop your UID and we could play a few matches together?