IMO you really want it to have a nice tight fit. And should be hard to pull out. It also depends on what batteries you are using. All the female bullets aren't the same size. My SMC bullets fit the SMC extremely good. Where the SMC bullets don't fit my Vant batteries at all. They are real loose on those. I've found if the females are on the tight side the SMC is the best. And if its on the bigger side the Schuur Speed male bullets are tuff to beat.