7 mag accuracy .25 at 200
270 accuracy, .3's at 100, .7's at 200.
7 mag is MORE accurate at 200 and beyond with this bullet.
Just wondering what (Lightly) into the lands ment. I am just now loading 140 Bergers. I haven't started playing with seating depths, but I am found my charge, so before, I just wanted to have an idea of what worked for you exactly
Put that bullet in a dummy case, with no primer or powder, burnish it well with a piece of 0000 wool - start with seater die high, keep moving down until land engraving barely touches the jacket. You should be able to just barely see several lands touching. Measure with a comparator and record that setting. From there you can jump or jam. Read this:
I dont understand when lots of people post about VLD s being finicky to find a seating depth. I gave up on testing seatings depths of the berger VLDs a while ago. I load all 130,140gn 6.5VLDs, 168 and 180gn 7mm VLDs (in 284 and 7mm/300WSM) at .015" jam and the 105gn VLDs at .010" jam. Back when I was experimenting a bit, I came up with these numbers and they are what I have stuck with in 7-8 different barrels used strictly for F Class competition at 300-1000yds (and sometimes longer).
Yes, if the throat started to wear, they wouldnt group very well, until I seated them back into the lands more.
Mike. I didnt bother doing much testing once these barrels were able to hold very very good elevation at long range, with most of these barrels getting very high X counts when I steer them right and get the powder charge right. Most of these barrels have shot X ring possibles or close to it. On some previous occaisions when experimenting with a throating reamer, or trying to clean up a slightly eroded throat, I did experiment with various jumps. I got one 284 to group fairly well at .100" jump, but couldnt get any quite as accurate as jammed. Also, in the limited testing of jumped VLDs, I found I had to experiement with various jumps, while when jammed, .015" jam always worked well.
I have recently played with jumped VLDs and Hybrids in my 6.5WSSM due to a too long throat, but gave up after trying out to .120" jump.