Originally Posted by Eaglet
When Broz gets tired and frustraded using the 0.419 BC7, he should go back to my above figures and he'll be a happy man!!!!!!!
You sound like you know me well.
But here is my take, for what it is worth. I have been shooting this rifle for 3 years now and have close to 800 rounds through it. All this time have been with 300 smk's and I have chronoed it several times. Once on an oehler with a 92.5 gr load of H-1000. I can't remember exactly but I do remember it was lower than my chrono and I dont remember any red flag that day. I mean, if it only showed 2710 velocity I would have been alarmed and surprised. I think I remember 28 something which was par for the course on my exbal program.
In short, I in no way feel that 2710 or less for velocity is accurate and I realize that I do need to get to an accurate chrono (oehler if possible) and see for sure.
Yesterday alone I shot 4 distances all in the same direction. So if this azmuth and coriolis thing really brings something to the table we can use 90* east and lattitude of 46*.
Here is the dope from yesterday.
FC was all the same with the exception of temp I will note that with each shot.
Baro for all was 25.75
700 yards temp 68 10.75 moa needed
995 yards temp 59 20.00 moa needed
1182 yards temp 65 27.25 moa needed
1395 yards temp 61 36.00 moa used, one shot, 2" high
Just for the sake of testing for the 1395 shot I left the windage at zero. It was dead calm both at the gun and target. These perfect conditions prompted me to gather data. With no wind, no spin drift added I hit dead center. Sure it was only one cold bore shot but I feel confident I could have shot two more and held 1/2 moa or very close.
Guys, I am sorry, but I am slipping away here. The LB on my pda takes sooo long to give answers. I have to page back and forth to data tabs, wind tabs, drift tabs, environment tabs and shoot tabs. Some pages take 30 seconds or more to open. I feel this all is great for at home work but not for hunting and this concerns me.
Late last night I loaded Bryans new G1 BC of .818 in my Nightforce exbal program. This with a velocity of 2795 gives me spot on elevation corrections for all the above listed distances and conditions I shot yesterday. Right down to the 1395 it calls for 35.75 moa.
I am feeling that my time will be better spent learning my rifle and what it needs for windage to be effective at long distances. The simplicity ond the much faster results from Exbal keeps pulling me back.
Like I said before, maybe my lack of computer skills and math is the problem and I need to accept that.
The great news is I feel I have gained a very reliable and consistent load with the 300 gr Bergers. I am confident I can hold 1/2 moa groups at very long distances. That is worth a ton to me.