Looking for advice cleaning my 500 Linebaugh BFR. I can?t find pistol bore brushes in 0.510? diameter. I?m using 0.500? brush with Chore Boy copper cleaning pad wrapped around it to build up the diameter. And 0.500? brass jags with doubled up patches. There must be a better solution... I hope! I feel like I?ve exhausted my web search. What are you 500L shooters using?