JFrank
Member
This is a great thread. I'm dropping in here to follow along. Thanks.
Come on by anytime, there’s always another chair around our camp fire…
This is a great thread. I'm dropping in here to follow along. Thanks.
Nice problem to have.......Obvious problem is they are all so clustered up
In a past life I tuned at 100 and sometimes 200 yards and found that while my groups were not influenced by conditions as much, the results didn’t translate as well to long range targets. Now I train how I fight and to add an example, I had a simple primer test awhile back that suggested fed 205 the winner however when I confirmed those results @ 550 yards the 205’s grouped poorly and the CCI 450& BR-4 stacked like cord wood.btw, those are great groups at 500! but doing load dev or diagnostics at 500 is silly. there's way too much atmosphere to have a reasonable control.
Yes sir it seems to be the magic number, the guy I bought this rifle from won the NBRSA nationals at 2920 ish, ( with a different rifle same caliber) so we’ll see how this plays out but I’m cool with whatever speed as long as it groups small and consistently.The sweet spot for 6BRA is ~2,930 fps. It’s uncanny how often it is shown to be true.
For mine the node is 30.6 - 30.8 of H4896, 108 Berger BT Targets, and you guessed it, 2,930 fps
View attachment 1138331 View attachment 1138332 I decided to weight sort this brass a little bit (nothing to extravagant) and maybe it’ll show a difference in ES and on targets. This is in conjunction with the sorting by FPS that I do.
Any body else sort brass by weight, fps or volume ?
Well thx, the rifle does the work, I just try not to get in the way.I am not as proficient as you are with a rifle, but I do sort by weight the 223/5.56 brass I use for SR competition. I found that 5.56 brass is the most consistent, but it is the hardest to trim. The 223 is all over the place.
Well thx, the rifle does the work, I just try not to get in the way.
How wide of a weight spread do you find gives you the results you can read on a chrono or see on the target? I’m currently sorting low med and high weights and watching for a correlation between the two.
View attachment 1140750 I might be right about a half grain as well..I was fire forming this new brass awhile back and noted higher FPS with a red stripe, green blob for mid and blue for the slowest, my case capacity haven’t evened out yet so I won’t hang my hat on anything but when I reviewed the weight the red striped brass weighed the most. (I interpret that as less capacity= higher pressure higher speed) imo too early to be certain but lately my small sample ES is single digits.
I’ve heard that about the 223 and wonder if it’s the same for bolt action or the just the AR type or cartridge design etc. I’m not versed in that caliber at all.
This article by Jason Baney is a bit lengthy but a very good read.
Enjoy..
https://www.accurateshooter.com/technical-articles/long-range-load-development/
I need to re-read the whole thing again myself, I sometimes experiment while tuning and sometimes loose my way, sometimes I get lucky and learn something new but that’s the fun part I suppose.just read it! good stuff.
View attachment 1141616 View attachment 1141617 I made it back out to my 500 yard spot today, the objective is to compare the brass lot number 1 vs #2 with a short charge ladder.
Looks like 30.9 on both sets will shoot pretty steady and this seating depth of 1.806 ( .026 jump ) has shown no reason for change.
ES of zero is pretty good also..