If the original Shockwaves are a problem loading, then these are a good place to look. I shot two packs of them out of different inlines I own and found no or little difference in accuracy as compared to the standard shockwave. I should mention that standard shockwaves do not load all that hard in my rifles.

As for the strength of the powder charge, I would treat them as I would any other shockwave. Of course the range testing of them will best prove to you what powder charge to use.