Possible RP-3 SAP rocket body's. Found at a WWII firing range used by Beaufighters

[saul]

Hi All
Found these at a WWII firing range used by Beaufighters, thinking they might be RP-3 SAP rocket body's? Ends seem to be split apart by explosion and one contains what might be unspent solid fuel??
Lots of 20mm projectiles also found at same site.
Cheers
Saul

 

[MiTasol]

Good find
You will find some good cutaways at 3\" 60Lb S.A.P. rocket , British, WW2