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@Regal
A lockring will fit but not really do anything, I don't think. Apart from look neater. (Must admit I did that on an old bike when I replaced the cup & cone BB with a cartridge job.)
The best way to fit a BB is with a torque wrench like the Park beam-type one, and just torque it correctly from the start. If it's popping when you force it tighter, I'd be worried that the threads were damaged. You might have over-tightened it.