WebFeb 5, 2024 · I then use the method advocated by Eric Cortina to determine seating depth - find the "jam" depth, back off .020, and then start incrementally decreasing the seating depth by .003 to find a range of 2-3 small groups, then load to the higher end of that range. With the JP, groups are so inconsistent that there is no uniformity of results - one ... WebFeb 11, 2024 · Bracket the second interval at +/-0.010" and 0.020" and you'll have a stack of five depths in 0.010" increments around an unjammed load. For the A-Max and Nosler BTs tangent ogive test of starting 0.015" off the lands and backing out in 0.005" intervals, you would get unjammed in the first 4-5 intervals.
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WebI usually start my test .020 out of jam and in .003 increments go to .070. I have a Remington .308 that likes .110 on the SMK 168. There is a good Youtube video by Eric Cortina called Don't chase the lands and here is another article that shows another seating node in the .050-.070 range. Seating Depth Testing WebMar 30, 2024 · Went out and tried a 1000 yard ladder test for seating depth. My goal was to see if I could cover more range with less shot. I used Eric cortina's jam -.020 and loaded 12 rounds .003 apart and shot them at 1000 yards. I had a mild left to right wind at 3mph Seating depths were 1 2.169 2 2.166 3 2.163 4 2.160 5 2.157 6 2.154 7 2.151 8 2.148 9 … english equivalent of hans
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WebEric Cortina has a really good J00Tube video on seating depth, worth a watch if you haven't seen it. Also just FWIW: I run a Tikka CTR 6.5 CM and with most bullets I cannot touch the lands, but I found that if I load the Barnes 127LRX to max mag length they will jam in the lands- so never assume, always check if you try a new bullet. 1 level 2 WebApr 21, 2024 · Others using this technique have likewise had great results, in some cases cutting their long-range vertical in half. While the Ladder Test method is primarily used to divine optimal charge weight, it can also be used to find the best seating depth or brand of primer. Introduction — Benefits of Ladder Testing WebOut of curiosity I measured the distance to the lands with a hornady OAL gauge and got an average length of 2.780" which would normally see me seating at 2.760 for my seating depth. Using the Cortina method I got … english eras in order