Wildalaska
member
Started load development for my 6.5x55 M41B sniper rifle...a few issues..
What I am trying to do is duplicate, as close as possible, military trajectory (so I can use the scope camming feature)...I chronoed military loads and the 139 grainers are running about 2550 fps +/-....My ideal load is gonna be in that velocity, I hope..
I am using Sierra 140 Match Kings, Lapua Brass, Fed 210M primers and Reloader 22..All cartrides are OAL 3.150 +/- .002..I ran 50 rounds starting at 39.7 grains and finsihing at 46 grains...
Some intersting things....
The best group of the day (all 3 shotsd) came at 42 grains for av velcotiy of 2419...this group measures about .425...42.2 grains average velocity was 2413, group size .480..going to 42.8 grains gave a velocity of 2488 and a group of .430...
But when I hit 43.2 grains my velocity had jumped to 2525...there was a flyer however that was running 2550....two shots were touching however they were 2506 and 2515...
In the 44s I was averaging about my target velocity groups were opening up,,,this could have been me however..
Question therefore...should I keep working the 44 grainers and try to get may target velcoity..or maybe try some strings of 43.4, 43.5 which is cose to my target velocity and maybe vary seating depth?
WildlookingforthemoreexperiencedguysAlaska
What I am trying to do is duplicate, as close as possible, military trajectory (so I can use the scope camming feature)...I chronoed military loads and the 139 grainers are running about 2550 fps +/-....My ideal load is gonna be in that velocity, I hope..
I am using Sierra 140 Match Kings, Lapua Brass, Fed 210M primers and Reloader 22..All cartrides are OAL 3.150 +/- .002..I ran 50 rounds starting at 39.7 grains and finsihing at 46 grains...
Some intersting things....
The best group of the day (all 3 shotsd) came at 42 grains for av velcotiy of 2419...this group measures about .425...42.2 grains average velocity was 2413, group size .480..going to 42.8 grains gave a velocity of 2488 and a group of .430...
But when I hit 43.2 grains my velocity had jumped to 2525...there was a flyer however that was running 2550....two shots were touching however they were 2506 and 2515...
In the 44s I was averaging about my target velocity groups were opening up,,,this could have been me however..
Question therefore...should I keep working the 44 grainers and try to get may target velcoity..or maybe try some strings of 43.4, 43.5 which is cose to my target velocity and maybe vary seating depth?
WildlookingforthemoreexperiencedguysAlaska