Sask has drilled out his Coker rim and reported the weight savings at ~75g: Coker Rim - #44 by saskatchewanian
A year ago I bought a Coker wheel and replaced the hub with a Nimbus 48h ISIS for use in a KH36 frame. When I had everything taken apart I weighed the rim only at 2lbs 9.5oz, which is very close to Sask’s 1175g pre-drilled weight.