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I don’t want to hi-jack this thread but I do want to thank the OP for his help. I just finished a .30 HRT with a 6.250” barrel and .120 handgun gas port. 225 gr. ELD-M bullets are going 1350 fps and 100% function. Next is to step down to subs with the 225s and supers with 110 TTSX. Your help made start-up a lot easier, thank you.
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Happy to have helped. I get some feedback through the site the articles are published on, but not a lot compared to stuff thats up on social media. Feedback is always appreciated.
Combined with Dr Phil's various ammo minimum velocity expansion threshold data on 300blktalk.com, one can extrapolate what range you can expect expansion at, through such a short barrel. Good info for bullet selection
http://www.300blktalk.com/forum/viewtopic.php?p=986983