Shooting Long Ranges With 308 Enfield?

I ges I will do that thank you, But would there be stuff that I would need to do to my gun? Like bedding it or just enything?

There is an old tried & tested method for becoming accurate at long range.
Start out at short range!
Seriously start out getting the kinks out of your technique & practice at 100yds.
Once you've done that back of to 200 & see what happens. This will let you find errors too small to have been seen at 100.
Now back of to 300 & repeat.
At this point you have learned to shoot well & "paid your dues", you've also learned a lot more than 95% of shooters will.
Now & only now start looking at what things you need, not "want" to do to the rifle to make it shoot better. We're not talking "looking pretty gizmos" here, but we are talking things like making regulation changes to the bedding.
Whatever you do do NOT start "re-bedding the rifle cuz' it'll shoot better", there are specific tricks & techniques to learn & practice here before you mess something up thru inexperience & impatience.
There are whole books written on how to get better accuracy from an Enfield, till you have read them all you'll be needing to just absorb knowledge.

As for ammo the post earlier is dead right. There are 2 ways to get a load your rifle likes.
Method 1 reload for it.
(This can be surprisingly inexpensive, for example a "Lee Loader" & a rubber hammer will give you amazingly good results for about $30.00.)

Method 2, try every load commercially available till you find the one your exact rifle likes, now buy a huge quantity of it.

(method 1 is faster & less expensive)

The DCRA here in Canada does what you are asking about (well not the 800 meter hunting, not sure anyone up here does that, I live on the prairies and a 300 to 400 yard shots aren't all that common, we try and get closer).

Well, thank you guys for the help. I will see what she can do before I do enything to It I know that much lol. I have a R700p That shoots well out to 900 yards and have dont it many times... I just wanted to know more about the enfield and how she opretates at that ranges. And what round without reloading will do it...But hell I might just start reloding for it too. (If it that cheap)

What Kevin has said is true. Extreme range shots on game animals are inhumane in almost every case.

Lost Roo, would you like to qualify your last?  By long range shots, do you mean 'long range hunting????