What would be the best character build for someone who attacks with rifles and sometimes uses melee weapons. I so far have around,
Guns 60
Science 45
Med 40-45
Melee 30
Repair 30-40?

I may have screwed up my character but I can still change it I guess.

Sorry to ask straight out seeing I am new to these forums.

Cowboy with maximum guns and 50 melee.

Any lever-action/revolver + Chance's Knife

Cowboy +
Shotgun Surgeon +
Bloody Mess +
Commando +
Center of Mass +
Better Criticals +
And Stay Back (Dead Money)=

a lever action shotgun that owns almost anything!

Commando and Center of Mass of mass is useless, may as well get Sniper(!) or Concentrated Fire(!) if you like VATS.

Any build with Guns, Cowboy and Handloader is the best build.

So then cowboy for sure I guess. I use VATS sometimes but not so often as I have help from Boone.

Best build involves getting a good mesh of stats, tag/level-up skills, perks, and equipment.

Case in point: my current character was a new experiment for me: I gave him 4 Per., 3 End., 4 Str., and 3 Int. However, I gave him 8 Agi., 9 Cha., and 9 Luck.Tag skills were Barter, Lockpick, and Sneak. And, he selected Good-Natured as his first perk.

These are not the best stats for combat: when he comes under fire, he gets shot to pieces. However, his high Luck ensured plenty of caps for the best armor available (and 100% effectiveness). And, with his low Int., he was able to recruit Arcade just by talking to him, and between his Plasma gun and his nerve bonus, Arcade is a death machine, usually has the threat resolved before my guy even gets his gun out.

To continue this build, I've mostly leveled up stats that are not combat-oriented: Lockpick, Science, Medicine, Barter, and Sneak. And perks include The Professional, Silent Running, Lady Killer, and Comprehension. For last-ditch self-defense, his Guns skill is pretty decent, and it's supplemented by Commando and Action Boy, but he has no other fighting ability whatsoever. But since he relies mostly on his non-violent skills, and has a comrade who can pulverize nearly any threat. Once Arcade's rejoined with the Remnants, he'll recruit Cass or Boone to take his place.

A character of this nature might not be for everyone, but I've made it work, I think.