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8,326 Posts
When my youngest son was 12-13. he was shooting an Excal Vixen, which is less powerful than the 308 banshee. I set him up with Slick Trick Standard 100 gr. heads. Nothing but pass throughs and quick kills. Not sure about the Spitfires (lots of people use them, they should be fine), but at the speed that bow shoots, you shouldn't have much trouble getting a small fixed head to fly well.