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Flatness of trajectory
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<blockquote data-quote="Dave King" data-source="post: 11296" data-attributes="member: 3"><p>Newbie_71</p><p></p><p> Your question:</p><p></p><p><strong>"Do you consider "Danger Space" of much relevance at all to civilian long range shooting? Do you know if it of much significance in regards to sniping?"</strong></p><p></p><p> Because most folks aren't worried about being shot (or shot at) by the critters they hunt there often isn't a tremendous amount of concern about a first round hit. That's not to say that there isn't a group of us that are first round hit hunters but we do have the luxury of making a second shot in most cases. In sniping (in the military manner) it's of considerable importance IMHO.</p><p> We have the luxury of ranging our target(s) but there is some error in the system(s). Lasers that range background objects vice the actual critter are a problem, MilDot ranging on critters of estimated size also introduces an error in range. Once the range error exceeds the danger space things get a little dicey.</p><p></p><p> For example: That 308 round at 2580fps, 175 (.498 BC) @ STP. Use a 12 inch kill zone size (two dimensional target) and we have a continuous danger space (MPBR) of 340 yards with a 290 yard zero. (Pretty good so far.) BUT move that critter to 500 yards and you now have a danger space 55 yards deep (470 to 525). Now well head out to 650 yards (my max range) and the danger space is down to 30 yards deep (635 to 665). 1000 yards and well have just under 16 yards of danger space (991 to 1007) (for comparison a military sniper would have about 46 yards of danger space for a 36" torso hit).</p><p></p><p> The error rate for laser ranging 1000 yards is +-1 yard for instrument (as stated by manufacturer I believe). Making sure we've collimated our laser and are actually ranging the critter at 1000 yards is another matter but we only have about 15 yards to play with, 7.5 in front and 7.5 behind, pretty close measurement for 1000 yards. What does this mean??? It's pretty difficult to keep this in mind when shooting and it's just a little too much info for most folks. I guess it's like walking a tight rope, we don't care what's on the sides or how far down it is as long as we stay on the rope. </p><p> </p><p> Little side note: If we push that same bullet to 3150fps the 1000 yard danger space opens up to about 26 yards...this is a good sell for a magnum chambering.</p><p></p><p></p><p><strong>"What I'm mostly been thinking about is which rounds will allow for the most tolerance in regards to distance approximation errors. For example, if the target is 500 yards away, what rounds will "forgive" the most in terms of how far away the approximation is. I've noticed that there are instances where a round with more actual flight time (and correspondingly more bullet drop) will actually allow for more error while still maintaining shot placement in the specified kill zone (even though this usually means you will have to crank your scope a little more) and whether or not others consider this to be as significant as total bullet drop and/or the number of click adjustments one must make on his scope."</strong></p><p></p><p> For any given BC the faster you push the bullet the greater the danger space you'll have. If it's dissimilar bullets you'll need to run the numbers but no matter the muzzle speed of the lower BC bullet the greater BC bullet at lower speed (within reason) will eventually beat it out in danger space.</p></blockquote><p></p>
[QUOTE="Dave King, post: 11296, member: 3"] Newbie_71 Your question: [B]"Do you consider "Danger Space" of much relevance at all to civilian long range shooting? Do you know if it of much significance in regards to sniping?"[/B] Because most folks aren't worried about being shot (or shot at) by the critters they hunt there often isn't a tremendous amount of concern about a first round hit. That's not to say that there isn't a group of us that are first round hit hunters but we do have the luxury of making a second shot in most cases. In sniping (in the military manner) it's of considerable importance IMHO. We have the luxury of ranging our target(s) but there is some error in the system(s). Lasers that range background objects vice the actual critter are a problem, MilDot ranging on critters of estimated size also introduces an error in range. Once the range error exceeds the danger space things get a little dicey. For example: That 308 round at 2580fps, 175 (.498 BC) @ STP. Use a 12 inch kill zone size (two dimensional target) and we have a continuous danger space (MPBR) of 340 yards with a 290 yard zero. (Pretty good so far.) BUT move that critter to 500 yards and you now have a danger space 55 yards deep (470 to 525). Now well head out to 650 yards (my max range) and the danger space is down to 30 yards deep (635 to 665). 1000 yards and well have just under 16 yards of danger space (991 to 1007) (for comparison a military sniper would have about 46 yards of danger space for a 36" torso hit). The error rate for laser ranging 1000 yards is +-1 yard for instrument (as stated by manufacturer I believe). Making sure we've collimated our laser and are actually ranging the critter at 1000 yards is another matter but we only have about 15 yards to play with, 7.5 in front and 7.5 behind, pretty close measurement for 1000 yards. What does this mean??? It's pretty difficult to keep this in mind when shooting and it's just a little too much info for most folks. I guess it's like walking a tight rope, we don't care what's on the sides or how far down it is as long as we stay on the rope. Little side note: If we push that same bullet to 3150fps the 1000 yard danger space opens up to about 26 yards...this is a good sell for a magnum chambering. [B]"What I'm mostly been thinking about is which rounds will allow for the most tolerance in regards to distance approximation errors. For example, if the target is 500 yards away, what rounds will "forgive" the most in terms of how far away the approximation is. I've noticed that there are instances where a round with more actual flight time (and correspondingly more bullet drop) will actually allow for more error while still maintaining shot placement in the specified kill zone (even though this usually means you will have to crank your scope a little more) and whether or not others consider this to be as significant as total bullet drop and/or the number of click adjustments one must make on his scope."[/B] For any given BC the faster you push the bullet the greater the danger space you'll have. If it's dissimilar bullets you'll need to run the numbers but no matter the muzzle speed of the lower BC bullet the greater BC bullet at lower speed (within reason) will eventually beat it out in danger space. [/QUOTE]
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