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Folks, went out to the range yesterday and worked on load development. Attached is my target. I need your help and your opinions about where to go from there. To recap, I changed primers to CCI450 and loaded .010" off the lands. Conditions were 50 degrees and wind was 0-3mph. Yes, I used wind flags. Also, my crappy chrony kept erroring out so my velocity data is spotty.
Best groups: 39.4gr @ .366"; 40gr @.374"; 40.3gr @ .387"
38.8 had consistent velocities ERR; 2952, 2963
39.1 ERR; 2963, 2963
39.4 ERR, ERR, ERR
To date my best group is .361 38gr H4350, BR-4, .005" off the lands.
Sorry, I meant .344" 42 grains H4350, BR-4 .005" off the lands. But too fast for PRS shooting.
So what are your thoughts? What is the gun and what is me? Where shall I go from here? Thanks!
41.2/41.3g would be the upper node and I think your first target jives with that as well. Do OAL test at 40.1g and 41.3g and see which one shoots best. Load up and practice.
41.2/41.3g would be the upper node and I think your first target jives with that as well. Do OAL test at 40.1g and 41.3g and see which one shoots best. Load up and practice.
This, ^ I might have missed it but it appears you changed seating and primers, if so I would do one change at a time to isolate results. Looking at what you have I would put $ on it that 41.3 will suck in with seating depth. Let the load tell you not any of us. My 6.5 x 47 shoots Hybrids right where most would rather not have them (just touching) but if I hadn't tried it I would never of known how extremely accurate this combo is.
So, then would I do .005 increments? 020, 015, 010, 005, touch, 005 in, 010 in ?
thanks for the suggestion! I agree, time to settle on a charge and start practicing. I have 175 cases that need fire forming!
Surprised no one has said anything about that saggy rear bag. I'm not a PRS shooter, but I would never use a bag that saggy on a bench set-up and expect good groups. The ears also look like they need more fill. I do not use heavy sand in the ears of my rear bag, play sand seems to work better. dedogsLooking a little saggy.
Surprised no one has said anything about that saggy rear bag. I'm not a PRS shooter, but I would never use a bag that saggy on a bench set-up and expect good groups. The ears also look like they need more fill. I do not use heavy sand in the ears of my rear bag, play sand seems to work better. dedogs
You need to buy a Magneto speed chronograph. Or maybe Adam MacDonald's Two-Box Chrono. If you don't want to spend the money then develop your load based purely on precision and after shoot a group at 1000 to figure out your velocity. After shooting and recording the data required at 1000 use the published Litz BC and adjust the MV in your ballistic computer until it agrees with your proven elevation correction. That is your effective muzzle velocity.
I would not recommend a cheap Chrono. It is just 50% of the money you could and will eventually put in a quality unit.
The Magneto doesn't inhibit load devlopment. It does change most barrels POI and often group size(it actually shrinks the groups of my first 6Dasher barrel). Some do OCW tests with the Chrono on, arguing that the changed POI is consistent so the elevation deviation can still be evaluated. I do not. You can still measure MV increase, SD's, and ES's for the same analysis of node using a MS. Worst case you just can't do it while also shooting for groups.