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Normally you can substitute a slightly lighter bullet with the load data of a heavier bullet and not have an issue. But the Sierra load data I found (pic below) for 175-200gr FMJs has an unexpectedly huge gap in minimum charges with CFE BLK between the 180gr and 190gr FMJs.
180gr stops at 1400fps with 15gr of CFE BLK but 190gr go all the way down to 1050fps with 11.4gr of CFE BLK
It would stand to reason that the 180gr FMJ has room to go below the 1400fps threshold with lower charges of CFE BLK.....maybe not down to 1050fps, but lower for sure. At least to the same energy as the 190gr with 11.4gr.
Aside from a bolt action versus functioning in a semi auto discussion...... what am I missing? Would 11.4gr to 14.9gr behind the 180gr FMJ cause more pressure than behind the 190gr FMJ? Seems to me 11.4gr should push a 180gr over 1050fps without an issue.
Just curious....
180gr stops at 1400fps with 15gr of CFE BLK but 190gr go all the way down to 1050fps with 11.4gr of CFE BLK
It would stand to reason that the 180gr FMJ has room to go below the 1400fps threshold with lower charges of CFE BLK.....maybe not down to 1050fps, but lower for sure. At least to the same energy as the 190gr with 11.4gr.
Aside from a bolt action versus functioning in a semi auto discussion...... what am I missing? Would 11.4gr to 14.9gr behind the 180gr FMJ cause more pressure than behind the 190gr FMJ? Seems to me 11.4gr should push a 180gr over 1050fps without an issue.
Just curious....