PCP Only Pellets

The H&N Field Trophy Power .177 is 8.8 gr and the H&N Baracuda Power is 10.65 gr. They are copper-coated lead, and are not that much lighter than lead pellets but are still labeled PCP-only. Is it the weight or is there some other concern about non-lead alloys being harder metals than lead and thus damaging non-PCP rifles? I would have also thought it was the weight, but the "Power" pellets seem to not line up with my logic there.

Here are their spec sheets:
 
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The H&N Field Trophy Power .177 is 8.8 gr and the H&N Baracuda Power is 10.65 gr. They are copper-coated lead, and are not that much lighter than lead pellets but are still labeled PCP-only. Is it the weight or is there some other concern about non-lead alloys being harder metals than lead and thus damaging non-PCP rifles? I would have also thought it was the weight, but the "Power" pellets seem to not line up with my logic there.

Here are their spec sheets:
I ssttiillllll haven't found much of a difference 🤷‍♂️🎩🤙
 
It's all about covering there butts if one gets jammed in the barrel.
Those pellets are harder aloy! And in a low powered springer with a tight choke it is possible that they could jam but not likely.
I have a Diana 38 that I shoot copper Crosman's out of with great accuracy so it's trial and error thing I suppose.