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Long Range Hunting & Shooting
Berger seating depth.
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<blockquote data-quote="biednick" data-source="post: 2862271" data-attributes="member: 123604"><p>Secant ogive bullets (like VLDs) are more sensitive to seating depth than other ogive styles. They take more work to dial in. Almost every bullet has a fairly wide band where they perform well. Secant ogive bullets are no exception, but the location of that band tends to vary more than other bullets and precision tends to fall off more agressively outside of that band. I switched away from secants for most cartridges when the VLDs I used dried up a couple years ago. They work well once they're dialed in, but in my opinion you don't gain enough to justify the extra effort. </p><p></p><p>I wrote this up for a similar thread a while back. It's the process I use to load secant ogive bullets. </p><p></p><p>0. Decide what I consider acceptable precision for the gun I'm loading for. I'm looking for a load that meets or exceeds that level of precision, not the best load possible. For a hunting gun that's going to be dependant on the range I want to hunt and the size of the game I'm hunting. Be realistic here. Your 7lb 300 Win Mag isn't going to be a .5 MOA gun, and it doesn't need to be for hunting.</p><p></p><p>1. Load up 5 rounds each at mag length or .010 off the lands, -.040, -.080, and -.120. Shoot those into 4 groups.</p><p></p><p>2. Evaluate the groups, and select any that are smaller than what you consider acceptable. Usually I find 1, but sometimes 2.</p><p></p><p>3. Load up 10 rounds at the lengths you selected in step 2, +.010, and -.010. Shoot all those into seperate groups.</p><p></p><p>4. Pick the best, shoot a couple more 10 shot groups at that length to verify, and stop if you meet your goal.</p><p></p><p>5. If the groups from step 4 are unacceptable, repeat step 4 with the next largest group from step 3. Repeat this step until a good load is found, you're out of groups to test, or the smallest group is larger than your goal. If you don't find a good load start over with new components.</p><p></p><p>It takes about 70 rounds to dial it in. I very rarely find more than 1 acceptable group in step 2 and very rarely have to repeat step 4.</p></blockquote><p></p>
[QUOTE="biednick, post: 2862271, member: 123604"] Secant ogive bullets (like VLDs) are more sensitive to seating depth than other ogive styles. They take more work to dial in. Almost every bullet has a fairly wide band where they perform well. Secant ogive bullets are no exception, but the location of that band tends to vary more than other bullets and precision tends to fall off more agressively outside of that band. I switched away from secants for most cartridges when the VLDs I used dried up a couple years ago. They work well once they're dialed in, but in my opinion you don't gain enough to justify the extra effort. I wrote this up for a similar thread a while back. It's the process I use to load secant ogive bullets. 0. Decide what I consider acceptable precision for the gun I'm loading for. I'm looking for a load that meets or exceeds that level of precision, not the best load possible. For a hunting gun that's going to be dependant on the range I want to hunt and the size of the game I'm hunting. Be realistic here. Your 7lb 300 Win Mag isn't going to be a .5 MOA gun, and it doesn't need to be for hunting. 1. Load up 5 rounds each at mag length or .010 off the lands, -.040, -.080, and -.120. Shoot those into 4 groups. 2. Evaluate the groups, and select any that are smaller than what you consider acceptable. Usually I find 1, but sometimes 2. 3. Load up 10 rounds at the lengths you selected in step 2, +.010, and -.010. Shoot all those into seperate groups. 4. Pick the best, shoot a couple more 10 shot groups at that length to verify, and stop if you meet your goal. 5. If the groups from step 4 are unacceptable, repeat step 4 with the next largest group from step 3. Repeat this step until a good load is found, you're out of groups to test, or the smallest group is larger than your goal. If you don't find a good load start over with new components. It takes about 70 rounds to dial it in. I very rarely find more than 1 acceptable group in step 2 and very rarely have to repeat step 4. [/QUOTE]
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