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Rifles, Reloading, Optics, Equipment
Reloading
Ladder test question
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<blockquote data-quote="ColoYooper" data-source="post: 1093105" data-attributes="member: 64765"><p>Gatr, at 100 yards, how much variation in shot placement do you expect to see between two shots that differ by 20 fps? With the photos you posted there is NO WAY that difference is outside your 100 yard group size. Performing the ladder test at 100 yards does nothing but wear out your barrel and waste money. The Ladder test needs to be performed at a distance where the variations in velocity can be observed, as well as variations in barrel ring harmonics. YOU WILL OBSERVE NEITHER AT 100 YARDS!!! (yes I'm shouting). Perform the ladder test at 600 yards and the variations in shot placement due to velocity will begin to cluster with variations in barrel harmonics. Then select the center charge for that cluster and you will be happy. I've done dozens of ladder tests and here is the best result I could ever hope for: (see attached) NOTE: There are bands where a faster bullet has left the barrel while the harmonic ring is at the bottom of its period, which groups with a slower bullet that has left the barrel while the harmonic ring is at the top of its period. NOTE2: The picture is rotated to 90 degrees to the left! NOTE3, there were variable winds of 6-12mph from 9:00 on that day, and I chose to just hold the 6 mph MIL setting. NOTE4, In case you've missed it, the Ladder test does NOT concern itself with horizontal dispersion. The purpose of the Ladder Test is to find a "SWEET" charge which will automagically correct itself for a hot charge, by exiting the barrel at the bottom of it's harmonic period, and a light charge, which will exit the barrel at the top of it's harmonic period, and hopefully group in the same VERTICAL position. NOTE5, this is a VERY CUSTOM 300 WM shooting Berger 230 gr Hybrids. I have only seen results this conclusive once...even with this rifle. So don't be discouraged if your results don't match. Most of the time it's like reading tea leaves...but give yourself a chance, and read those tea leaves at 600 yards.</p></blockquote><p></p>
[QUOTE="ColoYooper, post: 1093105, member: 64765"] Gatr, at 100 yards, how much variation in shot placement do you expect to see between two shots that differ by 20 fps? With the photos you posted there is NO WAY that difference is outside your 100 yard group size. Performing the ladder test at 100 yards does nothing but wear out your barrel and waste money. The Ladder test needs to be performed at a distance where the variations in velocity can be observed, as well as variations in barrel ring harmonics. YOU WILL OBSERVE NEITHER AT 100 YARDS!!! (yes I'm shouting). Perform the ladder test at 600 yards and the variations in shot placement due to velocity will begin to cluster with variations in barrel harmonics. Then select the center charge for that cluster and you will be happy. I've done dozens of ladder tests and here is the best result I could ever hope for: (see attached) NOTE: There are bands where a faster bullet has left the barrel while the harmonic ring is at the bottom of its period, which groups with a slower bullet that has left the barrel while the harmonic ring is at the top of its period. NOTE2: The picture is rotated to 90 degrees to the left! NOTE3, there were variable winds of 6-12mph from 9:00 on that day, and I chose to just hold the 6 mph MIL setting. NOTE4, In case you've missed it, the Ladder test does NOT concern itself with horizontal dispersion. The purpose of the Ladder Test is to find a "SWEET" charge which will automagically correct itself for a hot charge, by exiting the barrel at the bottom of it's harmonic period, and a light charge, which will exit the barrel at the top of it's harmonic period, and hopefully group in the same VERTICAL position. NOTE5, this is a VERY CUSTOM 300 WM shooting Berger 230 gr Hybrids. I have only seen results this conclusive once...even with this rifle. So don't be discouraged if your results don't match. Most of the time it's like reading tea leaves...but give yourself a chance, and read those tea leaves at 600 yards. [/QUOTE]
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