You're going to need a high enough spined arrow that you can probably get there with cedar.  Fir no problem, along with a host of other woods.  Lots of good options posted above already.

The Watco Danish Oil is good stuff, but I found the natural oils in POC result in not a lot of weight gain.  It can add a tremendous amount of weight to some other woods though.

Hickory (or ash). Then spend your evenings getting them straight but it's worth it since they are almost indestructible arrows. I made some short (22-24") hickory arrows that are over 600gr to shoot in my selfbows during the final tillering stages.

I like cedar but I've had problems in the 50-55 spine range getting raw shafts over 350-380gr. I've never had any spruce shafts that were any heavier than cedar.

Ive got 42- 29 in. 3Rivers ramin shafts made in 1996 that that weight 650 gr. w/145 gr. point, are as straight as my aluminums and hit really hard out of my 66# Groves Spitfire Mag I. These are the best heavy wood shafts Ive found so far and they were given to me by a good friend..

Thanks for all the replies. Going to check with a few of the sponsors here to see if they can hook me up.

I can get a 29" POC that heavy with little trouble. Dip, Cap dip (twice, 1st layer white, then pick your color)and crest. The sealant and cap dip adds lots of weight.

i made an arrow out of osage....it is 970 grains with a grizzly broadhead.....i will try to take a pic of it tonite....it is a pretty arrow.  i started with a square piece and knocked the edges off with a hand plane but mostly just scraped it with a pocket knife......

here are the pics of the osage arrow....it is 925 grains with the field point. i am thinking of making a cornstalk point for it.

pretty arrow, Ringo!

ace makes a 200 grain, two blade broadhead...

I would think with the high spine ya need that ya can get there with cedar, but ya do not have to get to the 650 really just close. I mean 99% of guys out there cannot tell a difference in 50 grains at 30 yards. Call around around an dask for a matched set that is 450 or so and ya can get there with a 30" arrow. Shawn

I recently bought 100 Premium cedar shafts 75-80# and 11/32. Only 2 were around 400 grains; 70 were 435-460 grains, and the rest were up to 480. One was 560 grains-go figure!

Any hardwood will get you to that weight pretty easily.  With cedars, should be able to find some 23/64 shafts that will help you reach that weight.  Much more difficult with 11/32 diameter shafts.  You'll need to ask your supplier for his heaviest cedar shafts when you order, in the neighborhood of 475-500 grains or more to start.  Cutting to length and point and nock tapers will take off 50 or more grains off the top.  Most suppliers won't have 11/32 cedars that heavy, or won't have many of them.  By soaking my 11/32 cedars in Watco oil, I can usually add about 50-75 grains, and I start with the heaviest 11/32 shafts I can find.  Cut to about 30 inches, 29 inches BOP, I can just barely reach a 650 grain arrow with a 135 grain point.  Sometimes have to go to a heavier 160 grain broadhead.