I’m thinking since I know I’m about .01 in the lands that I should start there and back off .005 for each new group . What do you think?On calibrating anything you adjust coarse, then fine.
Berger's test works for any bullets, as long as you're testing with a charge that allows you to see seating changes as dominate to results. Then go to powder development, or already developed.
Our matches are 300 and 500 yards from bench . No hunting guns . Please tell me what you do for benchrest ?As a load developer, I have found that most of the time, Berger or Hornady "accuracy type" bullets in hunting rifles like around .020" off the lands. This includes Hybrids and VLDs. So I always start at .020" and test powder charges. If I need a small tweak I'll test .015, .020, .025. If I need a big improvement I'll test .025, .050, .075, .100.
What I do for LRBR rifles really only applies to LRBR rifles......
Normally from that, i would pick one of the two and try .005 up and or down. If .130 shot good, id load up .125, .120, maybe .135. Maybe .115. Kind of a fine tune around that .130.I ran their test on Saturday for a hunting rifle. .010 / .050 / .090 / .130 jump six rounds each shooting groups of three just like Berger suggests. The .130 had the smallest group (and aggregate) with .050 in a fairly close second place. .010 jump finished in last place
140gr VLD H
Just for fun I'm going to give .050 and .130 another run to confirm
Our matches are 300 and 500 yards from bench . No hunting guns . Please tell me what you do for benchrest ?
Thx
Mark
Thank you sir ! I will try this .I have a pretty good idea of what will work for my LRBR rifles. I also consult with those I compete with who consistently do well.
In a 6 BRA I first run though the powder in .2 grain increments (.4 for a 300 SI or WSM) with a seating depth that commonly works. Usually +.006 from touch for the 6mm and +.021 for the 30s. There is usually a high node and a low node. Typically, the low node shoots best to 600 and the high node shoots best at 1000, but that still needs to be checked.
When I find the best powder charge I then check seating, and that can take some time. I'll start with the jam and test, then go to the jump and test. I start with .003 increments. Roughly from .021 jam to .021 jump. There will be a couple of seating nodes.
After I find the best seating depth I'll refine the powder charge, checking in .1 grain increments for the 6 and .2 grain increments for the 30.
That is my basic procedure, probably very common in LRBR. It assumes you have all the other stuff sorted out like neck tension. Neck tension is worth testing as well.
Of course, like I found at the last match, sometimes even with the most thorough development process, things can still go sides ways. With BR, EVERYTHING has to be as perfect as possible and we can leave nothing on the table.
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How to Load a Hybrid Bullet
Berger Hybrid Bullets were designed to be easy to load and tune to your rifle. Follow these simple steps to get started.bergerbullets.com
I found it by accident the first time. I just Googled it the second time.Thanks; How did you get there? I still don't see it on the their site.
Ah, found it. Buried pretty well: Main page, Technical Support (at bottom of page), Shooting Knowledge (again at bottom), select article.
My contention is that you calibrate things with coarse adjustments first, before moving to fine adjustments.I’m thinking since I know I’m about .01 in the lands that I should start there and back off .005 for each new group . What do you think?
Everyone HAS, a different approach ! With most of, the Secant Ogive designed Bullets like, Hybrid's, Classic and Elite Hunter, Berger's, and, a LOT of the Sierra & Hornady Bullets that, are Secant Ogive designs,..Ok ! So Berger states that with a target rifle you should start .01 in the lands and then move back .04 , .08 and then .12 ! Holy cow that’s a lot . They state one of those distances will shine over the others . Here’s the confusing part . Erik Cortina shoots Berger’s and he says to start with touching the lands and then move back in .003 increments till you find the sweet spot which he says you will get to within .03 !!!!
So you guys see why I’m scratching my head ! What’s up with this HUMONGOUS DISCREPANCY????
Thx
Mark
Thank you ! Very informative article . I used to use 105 Hybrid and I always jammed it . Maybe that’s why I’m not using it anymore . LolShort Action Customs has a bullet seating
Info on there site
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Bullet Jump Research
Explore bullet jump research for improved accuracy. Insights and resources to enhance your shooting performance.shortactioncustoms.com
I’ll have to try that on next load . I’ve already loaded 50 that are .01 in the lands (newbie mistake) and it’s not a starting load so I would feel much safer moving back .003 at a time till I get to say .025 jump . I think moving back .1 would raise pressure too much .My contention is that you calibrate things with coarse adjustments first, before moving to fine adjustments.
Berger laid this method out for you
That’s amazing ! Now does it repeat ?100 yards. 75 Amax. 223 tube gun 23.0 8208