Just got my first chronograph in 3 decades of handloading and having a little trouble understanding the data. Seems quite a bit of difference in the strings (series as Magnetospeed calls it) and wondering whats up! Same loads, same brass, same primers, same bullets, same powder and charge, all shot 15 minutes apart on same gun! Wondering how the SD and ES can be so different. Groups were pretty much the same except series 2 was a bit better.
I use a Chargermaster 1500 to trickle and weigh each load, Forster sizing and seating dies, RCBS Rock Chucker press, new Starline brass, GM205m match primers, 55 grain Nosler Ballistic tip bullets (although factory seconds) and LT-32 powder. Just can't understand why each series is so different. Am I asking to much to expect SD's and ES's to be very close to each other or is this about as good as it gets? All three are accurate enough to put down varmints of a fairly small size but I was hoping to get a little better results with this combination of goodies! Seems you almost have to shoot many groups to get an average of SD and ES. I could see passing up what might be a good load by only shooting one group!
Whats you experience with your loads? Is this one good? Am I asking to much to want something a little better or maybe more consistent would be a better word?
Series 1 Shots: 5 AR 223 55 nbt LT-32 21.7
Min 2695 Max 2739 Avg 2715 S-D 15.8 ES 44
Series Shot Speed 1 1 2739 ft/s 1 2 2713 ft/s 1 3 2719 ft/s 1 4 2712 ft/s 1 5 2695 ft/s
Series 2 Shots: 5 AR 223 55 nbt LT-32 21.7
Min 2717 Max 2736 Avg 2726 S-D 8.7 ES 19
Series Shot Speed 2 1 2719 ft/s 2 2 2735 ft/s 2 3 2717 ft/s 2 4 2736 ft/s 2 5 2726 ft/s
Series 3 Shots: 5 AR 223 55 nbt LT-32 21.7
Min 2707 Max 2735 Avg 2722 S-D 11.2 ES 28
Series Shot Speed 3 1 2714 ft/s 3 2 2727 ft/s 3 3 2707 ft/s 3 4 2735 ft/s 3 5 2727 ft/s
