Case Capacity Question
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jwrowland77
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I've shot them at 50, 100, 150, 200. Does it matter?
Wouldn't the same MV be the same MV? And same POI be the same POI?
Wouldn't the same MV be the same MV? And same POI be the same POI?
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Andrew Leigh
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It does matter,
from the moment your bullet leaves the barrel gravity impacts it. It also matters where you set your zero. For the purposes of the exercise your zero would be best at 100yds as this makes measurement easier.
At 100yds with a 150gr bullets I would not expect 50fps to have a measurable change on the POI. This all presupposes that your ability allows you to shoot 0.5MOA in order to see the difference.
The best way is to take 3 shots and to average the vertical displacement and then to repeat with the new loads.
A reloaders friend is a chrony, this is one of the most useful pieces of kit for load development.
from the moment your bullet leaves the barrel gravity impacts it. It also matters where you set your zero. For the purposes of the exercise your zero would be best at 100yds as this makes measurement easier.
At 100yds with a 150gr bullets I would not expect 50fps to have a measurable change on the POI. This all presupposes that your ability allows you to shoot 0.5MOA in order to see the difference.
The best way is to take 3 shots and to average the vertical displacement and then to repeat with the new loads.
A reloaders friend is a chrony, this is one of the most useful pieces of kit for load development.
jwrowland77
Member
Yes my zero is set at 100.
Wouldn't though if I set it my zero for 100, and shoot the load I set my zero with, wouldn't the loads that have slower MV show up lower, like the beginning of the workup? If the were faster than my go to, wouldn't they be higher than my control?
I'm learning new stuff every day.
I do have in the works, to get a chrono. See, my wife and I give ourselves an allowance for our hobbies, and I just haven't saved enough yet to order the chrono I want as of yet.
Wouldn't though if I set it my zero for 100, and shoot the load I set my zero with, wouldn't the loads that have slower MV show up lower, like the beginning of the workup? If the were faster than my go to, wouldn't they be higher than my control?
I'm learning new stuff every day.
I do have in the works, to get a chrono. See, my wife and I give ourselves an allowance for our hobbies, and I just haven't saved enough yet to order the chrono I want as of yet.
At 100 the slower load would prolly print the same. The reason is bullet time on the barrel. The slower bullet would leave the muzzle later and the recoil would have raised the muzzle higher so the slower bullet would exit at a higher plane in relation to the target. This would compensate for the additional bullet drop.
Kerf
Member
Think about it... you do have a reloading manual with a ballistic chart, I trust. Higher velocity bullets will print lower to point of aim.
jwrowland77
Member
Yes, I have 6 manuals.
That's odd, because when I shot my workup this past weekend using PP 2000-mr it was much the opposite.
I sighted in my rifle at 100yds using factory federal 175gr SMK. Just got a 20moa base that I had just put on. Started with the first load of the workup and it grouped low of zero. It wasn't until I got to the top end of the spectrum it finally came up and was matching my zero that I did with factory ammo. I know it wasn't me, as I shot it from a lead sled. I like shooting my workups from my lead sled, that way I can take me, out of the equation, and just see how the ammo likes the rifle.
You don't understand.
At 100 yards you are too close to isolate the "bullet drop due to velocity" variable because there are other variables muddying up the waters. I hope you took note of the obvious POI shift when working up your load and that not only did it shift upward but also to either side. POI does not change in a straight line. POI changes due to velocity and barrel harmonics. When you approach max it is entirely probable the faster load will print lower due to recoil, harmonics, etc. But you would need a pretty accurate rifle and shooting ability to see it.
At 100 yards you are too close to isolate the "bullet drop due to velocity" variable because there are other variables muddying up the waters. I hope you took note of the obvious POI shift when working up your load and that not only did it shift upward but also to either side. POI does not change in a straight line. POI changes due to velocity and barrel harmonics. When you approach max it is entirely probable the faster load will print lower due to recoil, harmonics, etc. But you would need a pretty accurate rifle and shooting ability to see it.
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