Army Aviation,
If you can find old German loads using their old R5 powder and similar bullet weight to the one you want to use, H4895 and VN140 seem to be close to the burning rate of R5. By reducing the charge weight and working back up carefully by chronographing the loads and stopping at or near the factory velocity, you should have satisfactory results. Bullets in .318" diameter are not overly abundant. You should be able to use any diameter bullet, over that size, that will freely slip into the neck of a case fired in your rifle and not sized. I have never seen your rifle or loading equipment/components, so you will have to follow your own judgement in loading your ammo.
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