Carneyman,
You didn't mention what powder you want to use, so here are three good suggestions for the 160 gr Flex-Tip bullet:
Varget....30 grs.
IMR-3031...27 grs.
H-4895....28 grs.
These are mild loads for your old rifle. If the action doesn't cycle properly add up to a full grain until you get good cycling. (These load suggestions are at least 2 grains under max load suggestions in the manual). Have fun.