As they come from the factory.... they suck. But if you upgrade the breech plug and do a bolt nose kit modification to the bolt, they're about as good as anything on the market today. Not sure I would bother messing with a 54cal though.

https://www.arrowheadrifles.com/product/700ml-replacement-plug/

https://www.arrowheadrifles.com/product/700ml-bolt-nose-kit/