dmoran
Donovan Moran
zfastmalibu said:
+++ 1
The "OCW Method" is what it is..... (with a procedure change <> groups instead of round robin groups).
That need validation at Long Range (in many instances, need re-tuned at a longer distance).
zfastmalibu said:
diego-ted said:Trying to push these around 2525, the 3rd net3d me 2377 and 5th 42 load got me 2530. 215 Berger hybrids.
Erik Cortina said:diego-ted said:Trying to push these around 2525, the 3rd net3d me 2377 and 5th 42 load got me 2530. 215 Berger hybrids.
Why do you have a pre-determined velocity?
I'll take accuracy over speed any day.
jsthntn247 said:Diego, my load is at 42 at 2525 also. Play with seating depth there and see what you can do, mine shoots allot better than me at 1k. 10-20 off seems to shoot best in most.
Erik Cortina said:Diego-Ted, how fast was 42.0 gr. load and what was the ES?
gstaylorg said:diego-ted said:Erik Cortina said:Diego-Ted, how fast was 42.0 gr. load and what was the ES?
Erik, the 42 load was right at 2533 with an ES of 11 for a 5 shot group.
Also, according to Greg, slightly over pressure in my current setup. ???
Ted
Perhaps more importantly, 42 gr is about halfway in between OBT nodes. Whether or not you buy into the OBT theory, the barrel times predicted by QL based on Ted's actual velocity and load data suggest that 40.4 gr should be right on top of an OBT node. That seems to line up reasonably well with the targets, with somewhere between 40.0 and 41.0 gr looking pretty good. Based on the QL prediction, Ted would need somewhere well above 2600 fps to reach the next OBT node, which simply isn't happening with his chamber specs/seating depth and Varget (>>>70K psi predicted).
Having had the opportunity to play with the numbers a bit, my suggestion was to find the center of the charge window, do a seating depth test, and call it a day. Even at a predicted velocity of only 2450 fps or so, the 215s should shoot inside his 185 load by somewhere in the neighborhood of 3/4 MOA at 1000 yd (10 mph full value wind).
For those that may be on the fence about trying Quickload, this is one example of how it can be a useful tool during load development. Running the numbers makes it pretty obvious that there is no need to try anything higher than 42.0 gr, which is very likely already over-pressure. Ted can therefore focus on accurately defining the charge window and optimizing his seating depth. If he wants to reach the next node without going way overpressure, it will require a chamber with significantly more freebore and possibly a different powder.
diego-ted said:Greg is always very through on his analysis of an issue and I can always proceed accordingly based on his take. In this case I think I have a bigger issue with powder choice than with freebore, though I know my .168 freebore is not optimal.
I will refine the load based mostly on seating depth from here on out and re-evaluate getting a new barrel once I have shot this load at distance several times. I really need to look at the OBT along with Quickload based on Greg’s recent experience applying both to load development.
Thanks to all the responded.
Ted
jsthntn247 said:Diego, for the 215's you really need an additional .075 of throat length. Either get get it throated or ditch the 215's and try some 200's which your throat is suited for.
Erik Cortina said:I posted more detailed instructions...........
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10. Final step is to load the new seating depth and load 5 shot groups in 0.1 gr. increments 0.5 gr. on each side of node (if pressure limits are not reached). This will cover an entire grain of powder and you will be able to pinpoint where the powder node starts and ends. In the summer, load towards the low end of the node, and do the opposite in the winter.
HAPPY SHOOTING! [/b]