I'm needing arrows for a 1960 grizzly 43# 62".
I draw 28 1/2".beman.easton,and three river spine charts all recommend a 400 spine for a 30" arrow with 125 grain head. This seems stiffer than what I usually see recommended on forums. Any recommendations?

If you can get one a spine test kit, and at the very least a point weight test kit.
It sounds possible depending on the center cut of the bow and side plate.

For aluminum arrows I would look into 1916's.

My bear Grizzly, 50@28", shoots 2016's cut to 30" with 7" wraps, 4" feathers, and 150 grain heads like bullets.  I have both bareshafted and paper tuned this set up.  2016's are equal to a .500 spine.

Owner of the archery shop shoots 30" Beman's out of his 45# recurve.  He runs 5" feathers and 125gr up front.

Grizzly's are cut to, but not past center if I remember correctly.  With that point weight, and you're probably shooting a dacron string, 400s are too heavy for 43-45#.  Even 500s might be heavy, but that's where I recommend starting.

The bow is cut to center,has a kodiak style strike plate and a feather rest. Part of my original question is are the spine charts typically heavy. They call for 400 but it seems most agree that is too stiff. I don't want to go much shorter than 30. Whatever I get it'll only be a few for now. Thanks

Yes, a lot of folks feel the spine charts are too heavy re trad bows.  500s will be plenty, IMO.  I draw a half-inch less than you do and cut my arrows to 29 inches BOP and shoot 500s out of 45-50# bows with about 250 grains up front.  You may need to go to a slightly heavier point, but start with 125 and see how that shoots. Good luck.

I think I'll try the 500. Centershots. They'll be about 413 grains or 9.58gpp 15.8% F. O. C. according to an online arrow calculator.  Do those numbers sound acceptable for deer out of a 43# recurve.
Thanks

That will work, though you might end up with more point weight to get the arrow tuned properly, and thus a heavier arrow.