savageshooter86 said:
savageshooter86 said:Oehler 35P w/ 4' rail
I thought that was odd too
43.1-- 2675,2669,2677,2663
43.4-- 2713,2673,2685,2674
43.7-- 2717,2702,2717
44.0-- 2735,2744,2743
AlanPF said:I have a question, and sincerely hope that hasn't already been answered on the 88 pagesof this topic.
If you use this method at 100 yards to tune loads for 1000, surely you would need to also test at 1000 to confirm? Because there are some sources of long range inaccuracy that will not be detectable at 100 yards. One is bullet uniformity, or more particularly BC consistency. BCs can vary by several %. Bryan Litz quoted a figure of 8% improvement in BC with a Whidden pointing die. Let's say two projectiles vary by 4% in BC, with one having a G7 BC of 0.300 and the other 0.312, and identical muzzle velocities of 3000 fps. I calculate the difference in bullet drop at 100 yards to be 0.003" which is undetectable, but at 1000 yards the difference is nearly 6 inches, enough to put you out of the 10 ring.
Erik Cortina said:You can not tune a gun to compensate for bad bullets. Get your gun properly tuned at 100 yards and get your bullets sorted to minimize BC differences and it will shoot at 1,000 yards.
jsthntn247 said:I have a question about load testing at 100 yards when trying to keep everything in mag length. When seated to 2.800 I am jumping the bullet .140 in my 308. I can tell I'm in a node but the seating depth is not best. Would you still back off 2.800 in .003 increments or use something like .010 increments since you are sooooo far off the lands to start??
jsthntn247 said:I have a question about load testing at 100 yards when trying to keep everything in mag length. When seated to 2.800 I am jumping the bullet .140 in my 308. I can tell I'm in a node but the seating depth is not best. Would you still back off 2.800 in .003 increments or use something like .010 increments since you are sooooo far off the lands to start??
Wow! 61 views and not one feedback.. Must be really bad or really good! ;Djlow said:Did an OCW with my 24†AI AT 308 today and here are the results: Berger 185 Juggernaut, Varget, Lapua brass, Tula LRP. Bullets seated to 0.010†jump. Conditions: 46 degree, 80 humidity, pressure at 29.23. Powder range 44.0 to 44.8 grains at 0.2 grain interval – no pressure signs. QL predicted OCW at 44.5 grains.
Top right 3 rounds fouler done with cheap Win brass/175 SMK/42 grain Varget so ignore.
Plotted average POI using OT data with red dots and arrows showing movement. Looks like average POI for the 5 groups did not change much within powder range tested. Probably the most movement outside group was the first charge i.e. 44.0 grains.
MV captured with Ohler 36p. Average MV linear within powder range. All groups had single digit SDEV.
First question is what’s next? Since the average POI did not move much and group size was small, should I still try to optimize with seating depth adjustment?
jlow said:Wow! 61 views and not one feedback.. Must be really bad or really good! ;Djlow said:Did an OCW with my 24†AI AT 308 today
brians356 said:jlow said:Wow! 61 views and not one feedback.. Must be really bad or really good! ;Djlow said:Did an OCW with my 24†AI AT 308 today
I think we're all waiting for Erik to comment - I know I am. It's his thread, and his methodology.
(Not sure why you refer to "OCW" however, that's a quite different methodology than what's happening here.)
jlow said:Did an OCW with my 24†AI AT 308 today and here are the results: Berger 185 Juggernaut, Varget, Lapua brass, Tula LRP. Bullets seated to 0.010†jump. Conditions: 46 degree, 80 humidity, pressure at 29.23. Powder range 44.0 to 44.8 grains at 0.2 grain interval – no pressure signs. QL predicted OCW at 44.5 grains.
Top right 3 rounds fouler done with cheap Win brass/175 SMK/42 grain Varget so ignore.
Plotted average POI using OT data with red dots and arrows showing movement. Looks like average POI for the 5 groups did not change much within powder range tested. Probably the most movement outside group was the first charge i.e. 44.0 grains.
MV captured with Ohler 36p. Average MV linear within powder range. All groups had single digit SDEV.
First question is what’s next? Since the average POI did not move much and group size was small, should I still try to optimize with seating depth adjustment?