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Skydiver, the "best" comment is the start of a never ending argument. There are 1:48 proponents and others for all other twists. Caliber and your intended use are factors in what twist you might choose. The popular thinking (and there are those who will debate this) is a 1:66 is a bit more forgiving of load variations than 1:48 and will handle heavier hunting charges better than a faster twist. OTOH, you may have to use heavier loads to get the accuracy you want. You will eventually meet people who will tell you 1:36/48/56/66/72/80/etc is the "best".
You need to shoot more, learn more then make your own choice.
BTW, I shoot 1:48 and 1:66 in .45 cal. for target and some hunting. My .54 for hunting is 1:72. I also use for target but it consumes a lot of powder, makes a lot of noise and has noticable recoil.
Everything is a trade off. Learn then make your choice.
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