If only one could find such powders ;(I would recommend a slower burner that will give better case density like H1000 or IMR 7977, especially if you're loading heavies long.
I know, rough times. H4831SC will definitely work, I just didn't like the case density when loaded long. I don't remember powder charge off the top of my head but I was launching a Berger 168gr VLD at 3,000fps which is where I usually aim to be. In your case utilizing what you have (and what I should have done) I would start with the end of the bearing surface of the bullet right at the shoulder/neck junction, and flirt with extending seating depths from there once you find a velocity node. After reading this article (and many others, but this one is the most data driven with multiple accredited shooters) I've stopped worrying about touching or being within a magical distance from the lands, and started loading where I could optimize multiple aspects of a load. Just my .02, hopefully you can get something to work for ya.If only one could find such powders ;(
If you can get it give H1000 a try. Best I've found with my & Rem Mag.My 7 Mag (Maggie) is a Remington 700 CDL with the 26in barrel. I originally used 4831 with 154gr SST’s cause that’s what we had on hand but I worked all the way up to 68 grains I believe, still not showing pressure signs but only getting about 2850 FPS. I could stack em in one hole but I wasn’t satisfied with the velocity. After months, I got lucky and caught some H1000 online and of course paid a little extra. The very next week at a gun show a guy had a whole case of H1000 for $40 per 1lb. I forget how much, but with the H1000 I’m now pushing a 160gr about 3200 and it’s a mild load.
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What primer did you use?Just came upon this post, I just did load development on a Christiansen arms 7mm. 168 grain Berger, 65 grains of H4831SC brought it in at 3000 FPS. I ended up finding a seating depth node .025-.035 off the lands. Sub .5” moa out to 600 yards.