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The 245 Spitfires (and all Buffalo SSBs) have been measuring under .450. I have around 260 SSBs in 285 grain.... yet to find one that measures over .449.... most are .448. I have recently purchased a thicker Hornady plastic sabot for these. The MMP HPH-12s that came with the Buffalos fit too loose - yet these are the thickest sabots MMP offers. The thinnest sabot MMP has (HPH-24s) still do not load as easy as the Harvesters. MMP uses a different composition to retard high temperatures than Harvester. As a result, they tend to be "bore wall stickier."