Quote:
Originally Posted by Eddietruett
The Sierra and XTP both averaged around 1375fps. The Speer averaged 1300fps. The difference of the Sierra and XTP was around 40fps.
Not sure if that's about normal or not...
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The HDY XTP & the Sierra bullets are cup and core bullets; hard copper jacketed bullets. The Speer bullets is essentially a high quality plated (electro-chemically bonded) bullet & are slightly softer giving them a bit more barrel friction thus slightly slower velocities. Ordinary plated (economy) bullets are the slowest of all typical bullet types.
I've read several articles in Handloader magazine that noted ES/SD had little to no effect of grouping/accuracy. In fact in one test (45ACP) I remember the load that had the highest ES, & SD of the handloads tested, had the smallest standard group deviation. (See pink highlighted data below.)
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