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Bryan never described specific cause/affect aspects of BTO.
He also did not state that he sorts on BTO......... snip...........
Bryan never described specific cause/affect aspects of BTO.
He also did not state that he sorts on BTO........ snip...........
VERY significant if you shoot 1000 BR.
After 10 matches the final 10 match group aggregate came down to .0024 difference between winning and second place. I believe in 1000 yard BR the little things matter more. Matt
There is a purpose in it - to win.
That said, I can't justify BTO measurements. I do some sorting because it is easier than trying to make everything the same.
Even with the sorting I do, I had my first significant flyer at long range this weekend- a good 2.5 feet from the group. That is one bullet out of about 8000 Bergers that I've fired.
Smithcollector
I believe the photo below is related to your question. This is a result of a bearing surface sort of 1000 bullets from the same manufacturer and all are the same lot. There is a .008 difference between these bullets. On a previous lot of these same bullets I had a .014 bearing surface variance out of a box of 500. I did a test on those bullets at 1000yds. Shot groups with all things being equal other than a .014 bearing surface difference and the groups printed 4" apart from each other vertically.
IMO, bearing surface, BTO, and seating stem to ogive measurements must be consistent for small groups. I use to measure weight and overall length but stopped since my testing showed these steps didn't prove to be worth the effort. Others may have a different opinion. Remember that information gained from other shooters may be very helpful but you should verify the results yourself before treating it as gospel.
View attachment 991384
What makes you think this? Which of potential tension, load density, bullet BC, has your testing ruled out? Was your only difference bearing length, or bullet attributes affecting bearing measure? Or was it BTO measure?The difference in friction from a longer (or shorter BS) caused a different point of impact.
This is never true.The good news is, it does not matter why
GolfMike, what discipline do you shoot?.. jim
Smithcollector
I believe the photo below is related to your question. This is a result of a bearing surface sort of 1000 bullets from the same manufacturer and all are the same lot. There is a .008 difference between these bullets. On a previous lot of these same bullets I had a .014 bearing surface variance out of a box of 500. I did a test on those bullets at 1000yds. Shot groups with all things being equal other than a .014 bearing surface difference and the groups printed 4" apart from each other vertically.
IMO, bearing surface, BTO, and seating stem to ogive measurements must be consistent for small groups. I use to measure weight and overall length but stopped since my testing showed these steps didn't prove to be worth the effort. Others may have a different opinion. Remember that information gained from other shooters may be very helpful but you should verify the results yourself before treating it as gospel.
View attachment 991384