What type of powder are you planning on using? If it's something like Varget or R15 you will get charges ranging from 1gr apart. If you use something like 2000-MR you can get pretty consistent charges which would most likely spread a +/- .2gr range.
The key to accuracy is consistency. That's why precision shooters mainly load on single stage presses and weigh each charge.
More or less any decent 308 bolt gun with glass will be plenty accurate out to 6-900 yrds even with factory bulk ammo. But it comes down to if you want to hit the steel pig or hit the same steel pig's eye.
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