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Dwh7271":4lomh9go said:I now use it exclusively.
A lot fewer cartridges to find the sweet spot.
Two questions -Dwh7271":2k8nho9e said:I look at max, go down 1.5-2 gr and load every .2 gr .
I get Dwh7271 to do a QL powder run for me for a specific bullet and weight which shows max charge for each powder with that particular bullet from the info I supply him, H2O cap, Barrel length and max SAMMI psi for the cartridge I'm loading. I take the top powder which gives max velocity or one that I have on hand. Subtract 1.5-2.0grs and work up a chart subtracting .2grs till I reach 10 loads. I then shoot them threw the chronograph recording my velocities and looking for pressure signs and a flat spot in velocity. you may see more then one in that 10 shot string. Chose the one that best suits your purpose and work with seating depth till you get the best group.Dr. Vette":1w0g1qkp said:Two questions -Dwh7271":1w0g1qkp said:I look at max, go down 1.5-2 gr and load every .2 gr .
Whose max do you believe, given that Nosler and Hodgdon, for example never seem to match?
0.2 seems like an awfully small change for my 7mm or more 300 Wby Mag. I've usually done 0.5gr with other load development for those. Do you vary by a percentage of the size of the cartridge, or 0.2 no matter if it's a .223 Rem or a 338-378 Wby?
Interesting.tddeangelo":1lghhls4 said:Three rifles of mine responded splendidly to this treatment.
Making a 0.2gr adjustment took my 300WSM from shooting groups that ranged between 0.75 to 1.5 (not a typo) at 100 yards to consisten 0.5-0.75" groups at 100. This type of testing is what showed me that a small dip in the charge weight....from 63.0gr to 62.8gr. My 0.5gr increments and "shoot and try" methods prior missed that node entirely.
Dr. Vette":1okpf20f said:Two questions -Dwh7271":1okpf20f said:I look at max, go down 1.5-2 gr and load every .2 gr .
Whose max do you believe, given that Nosler and Hodgdon, for example never seem to match?
0.2 seems like an awfully small change for my 7mm or more 300 Wby Mag. I've usually done 0.5gr with other load development for those. Do you vary by a percentage of the size of the cartridge, or 0.2 no matter if it's a .223 Rem or a 338-378 Wby?
Dr. Vette":22u2t32w said:OK, thanks for the info.
I wonder if shooting a string 0.5 apart to look for max would be useful for those of us without a QL program? Then, compare to book max and go from there. I've found that real max (based on signs) compared to book max may be a grain or more different, which would affect where one sets up the 1.5-2.0gr starting point.