Agreed, I have heard about massive compression of early ball powders in the 458 causing ignition problems, probably ww-748, thank god for todays powders, I even use the old H-335 to get a reliable and easy 2150 fps with 500 gr Woodleigh and Partition bullets, same charge under the 450gr BBW #13 solids for better than 2300 fps, that has to be a hell of a penetrator.
