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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
MERC - Maximum Effective Range Calculator
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<blockquote data-quote="entoptics" data-source="post: 1967084" data-attributes="member: 104268"><p>Figured I'd go ahead and give some examples of just how powerful this tool is.</p><p></p><p>For perspective, I've put at least 100 lbs of powder down the tubes of various rifles, and in retrospect, I wish I'd had this puppy a decade ago to help me hone in on my ultimate goal. Hitting what I'm aiming at. I wasted a lot of time, money, and barrel in various experiments that probably could have been far better spent by learning what variables I could control, and what variables I had to <em>learn to deal with</em>.</p><p></p><p>So...A quick comparison of 30-06 and 7mm Rem Mag. All uncertainties are the same, only the bullet and velocity have changed.</p><p></p><p>Shooter/Rifle = 0.5 MOA (I've never owned or been such a thing, but one can dream right?)</p><p>Muzzle V standard deviation = 10 fps (good quality handloads)</p><p>Wind = 10 mph from the right.</p><p>Wind uncertainty = 30% (± 3 mph with a 10 mph nominal wind, good mirage and a kestrel?)</p><p>Wind direction uncertainty = 45° (shooting in some variable terrain across a canyon for instance)</p><p>Range uncertainty = 5 yards (got a pretty good rangefinder reading, but not perfect)</p><p></p><p>This is what you see after you've run your two simulations. Red is 7mm Mag and blue is 30-06 in all the graphs and table headings.</p><p>[ATTACH=full]210659[/ATTACH]</p><p></p><p>To zoom in on the information at hand.</p><p></p><p>1) Note how the groups are not centered around the bullseye (500 yds). This is due to variability in the wind angle and speed. We'll hopefully address this cool insight in another post. The 30-06 with it's slower, lower BC bullet is affected more than the 7mm RM obviously. At 500 yds, it's 8 out of 10 for the '06 vs 9 out of 10 for the 7mm.</p><p></p><p>[ATTACH=full]210660[/ATTACH]</p><p></p><p>2) Will my gun actually get the job done and drop the slavering beast in it's tracks if I make a good hit? We can help answer that with the energy and velocity thresholds you enter. In this scenario, we're asking 1800 fps and 1500 ftlbs of energy on target (you choose values you're comfortable with in the inputs section). The results table will highlight the output in red if it's below this threshold, and there's also a line on the velocity and energy graphs to show this.</p><p></p><p>[ATTACH=full]210661[/ATTACH]</p><p></p><p>[ATTACH=full]210664[/ATTACH]</p><p></p><p>Note that the 7mm Rem (red simulation A) is still carrying plenty of speed/energy to 950 yds. The 30-06 (blue simulation B) with its lower B.C., runs out of steam at only 650 yds.</p><p></p><p>Also note, that despite both rifles having 0.5 MOA precision, the hit percentage drops below "ethuhcul" odds (misspelled to avoid stupid filter) way before the 10" target is half MOA. At 1000 yds (~1 MOA for 10"), it's only 27% even for the superior ballistics of a 7mm Mag. Both rifles run out of accuracy long before they run out of power.</p><p></p><p>In fact, we hit "coin flip" at 650 yds for the 30-06 and 750 yds for the 7mm.</p><p></p><p>3) But what about recoil? Of course a more powerful cartridge can go further, but what price am I paying? We've got you covered...</p><p></p><p>By inputting your rifle's weight (and optionally charge weight for more accurate calculations), MERC will calculate the free recoil, which is displayed on the far right.</p><p></p><p>[ATTACH=full]210663[/ATTACH]</p><p>[ATTACH=full]210662[/ATTACH]</p><p></p><p></p><p>Hope that helps clarify some of what you can do with MERC. We're planning to add some more insight and tips in the coming days.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1967084, member: 104268"] Figured I'd go ahead and give some examples of just how powerful this tool is. For perspective, I've put at least 100 lbs of powder down the tubes of various rifles, and in retrospect, I wish I'd had this puppy a decade ago to help me hone in on my ultimate goal. Hitting what I'm aiming at. I wasted a lot of time, money, and barrel in various experiments that probably could have been far better spent by learning what variables I could control, and what variables I had to [I]learn to deal with[/I]. So...A quick comparison of 30-06 and 7mm Rem Mag. All uncertainties are the same, only the bullet and velocity have changed. Shooter/Rifle = 0.5 MOA (I've never owned or been such a thing, but one can dream right?) Muzzle V standard deviation = 10 fps (good quality handloads) Wind = 10 mph from the right. Wind uncertainty = 30% (± 3 mph with a 10 mph nominal wind, good mirage and a kestrel?) Wind direction uncertainty = 45° (shooting in some variable terrain across a canyon for instance) Range uncertainty = 5 yards (got a pretty good rangefinder reading, but not perfect) This is what you see after you've run your two simulations. Red is 7mm Mag and blue is 30-06 in all the graphs and table headings. [ATTACH type="full"]210659[/ATTACH] To zoom in on the information at hand. 1) Note how the groups are not centered around the bullseye (500 yds). This is due to variability in the wind angle and speed. We'll hopefully address this cool insight in another post. The 30-06 with it's slower, lower BC bullet is affected more than the 7mm RM obviously. At 500 yds, it's 8 out of 10 for the '06 vs 9 out of 10 for the 7mm. [ATTACH type="full"]210660[/ATTACH] 2) Will my gun actually get the job done and drop the slavering beast in it's tracks if I make a good hit? We can help answer that with the energy and velocity thresholds you enter. In this scenario, we're asking 1800 fps and 1500 ftlbs of energy on target (you choose values you're comfortable with in the inputs section). The results table will highlight the output in red if it's below this threshold, and there's also a line on the velocity and energy graphs to show this. [ATTACH type="full"]210661[/ATTACH] [ATTACH type="full"]210664[/ATTACH] Note that the 7mm Rem (red simulation A) is still carrying plenty of speed/energy to 950 yds. The 30-06 (blue simulation B) with its lower B.C., runs out of steam at only 650 yds. Also note, that despite both rifles having 0.5 MOA precision, the hit percentage drops below "ethuhcul" odds (misspelled to avoid stupid filter) way before the 10" target is half MOA. At 1000 yds (~1 MOA for 10"), it's only 27% even for the superior ballistics of a 7mm Mag. Both rifles run out of accuracy long before they run out of power. In fact, we hit "coin flip" at 650 yds for the 30-06 and 750 yds for the 7mm. 3) But what about recoil? Of course a more powerful cartridge can go further, but what price am I paying? We've got you covered... By inputting your rifle's weight (and optionally charge weight for more accurate calculations), MERC will calculate the free recoil, which is displayed on the far right. [ATTACH type="full"]210663[/ATTACH] [ATTACH type="full"]210662[/ATTACH] Hope that helps clarify some of what you can do with MERC. We're planning to add some more insight and tips in the coming days. [/QUOTE]
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MERC - Maximum Effective Range Calculator
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