Quote:
Originally Posted by B40
Loaded and fired the Lyman load of 4.0 gr at 1.075 and 4.2 gr at 1.100. Neither cycled the action sufficiently to eject cleanly and allow feeding of the next round. Will continue up slowly with N340 and also try the VihatVouri recommended N340 starting load for FMJ/FP of 5.3 gr at 1.142 OAL. Thanks to you all for your advice and to Sieger for the comment on SR4756, which may be the ultimate winner.
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Hi:
The longer 1.142 sounds like a good place to start (always start too long and shorten 0.01 as needed for proper function).
Your N340 (VV) falls right between HS-6 and SR 4756 in buring rate, so it should be just fine. To shorten up your development time, start low and build up in 0.1 grain increments. Load and fire only one of each weight until the hold open works. You then have found the relative range.
With your N340, I'd start at about 4.5 or so. Chances are your most accurate load will be somewhere between 5.0 and 5.5 (my best experienced guess).
Good luck!
Sieger