I use 3.2 grains of W 231 with a Remington 148 HBWC in my Model 52, two Model 14s and a Model 67. I think you have been misinformed since this is pretty much a recognized, standard .38 load with the HBWC. I do know you do not want to go too high as there is a danger of blowing the skirt off the HBWC. A more common load in the Model 52 is 2.7 or 2.8 grains of Bullseye. I have used this load successfully in my revolvers as well.

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Pete