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Load data for 300 Whisper, all with 220-gr bullets. altered 221 Fireball cases and Rem 7 1/2 primers, ALL give sub-sonic speed:
AA5 - 7.5 grs AA7 - 10.5 AA9- 8.5 1680 - 10.3 2015 - 12.0 (I cannot understand the charge weight for AA7, but that powder has always been a conundrum to me - RR) H110 - 9.0 4227 - 9.2 335 - 13.8 Edit to add: Here's the webpage source of this data http://www.quarterbore.com/300whisper/
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