Help me improving my skills

Gentleman,

I am a continuous player since Halo 1 came up for the xbox.
Unfortunately it was always couch co-oping for me, enjoying the fun to hang out with friends and to ask your mate to kill you when you where running out of ammo.
Never were really into playing it online. Actually now that i think about it, I did not play any shooter at all online.
This changed with Halo 5 for me.
Actually, i bought the 360 - just because of that game… so it became really clear that the multiplayer needs to be played.

At the beginning I was enormous frustraded, headshot here, assassination there… doing pretty much the big mistakes like running into the enemys base and trying to act like Rambo, which btw, worked for about 7 seconds, before getting killed by marines.

So all this became better - but.
I still have huge problems when it comes to aiming.
Especially with the Magnum and the BR - Shooting around wild, can not focus my target or even the head.

So anyone of you has some tips how to train that?

Thank you gents

Play more. Experience will help alot as well as adjusting to your favourite sensitivity which helps.

Try training in infection. if you want to get good at headshots, then infection is for you as well as staying alive and learning how to hide the right way

Adjusting your sensitivity is probably the best thing you should do. 2 vertical and 4 horizontal is a pretty good setting for me.

If you want to get better at landing head shots play swat, and a lot of it. Headshots and perfect kills must become a second nature, not really something you can change over night.