i have some ,318, norma rn bullets 220grn and they do o.k but i mostly shoot 165---175 grns 32-40 plain base with the savage load data ,, very mild loads and a pleasure to shoot .
my go to powders are ,,unique 13grn.
2400 16.5 grns.
and trail boss fill case to shoulder, empty out and weigh and x it by .7 and you have a good starting point for the gew 88.
shoot all day with no bruisers,,,