we are every day using repurposed materials ad substances the idea of paperpatching actually stimulated my mind,what about protecting the base with( in place of poly ethlene plastic,how about Teflon plumbers tape,it is thin,flexible,apparently heat resistant,I originally thought of wrapping it around like paper patch,a 3" double wrap on a .458 Made .459 HOWEVER it's lubricity in a wrap around made me wonder if the bullet would just shoot out of the wrap leaving it behind( maybe in the barrel?)however it occured to me that a cross piece loaded into the case around the bullet would not have this tendency.any thoughts sorry just came to me!