Long range load development at 100 yards.

[dmoran]

OCW

+++ 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).

 

[Erik Cortina]

Diego, I like 40.0 - 40.5 as well. You say at 42 speed was perfect, what does that mean?

 

[diego-ted]

Trying to push these around 2525, the 3rd net3d me 2377 and 5th 42 load got me 2530. 215 Berger hybrids.

 

[Erik Cortina]

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.

 

[diego-ted]

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.

I agree and that is usually how i approach development. In this case, Shooters That Have Been Having Success Shooting This Bullet Suggested I Try And Get Them Up Above 2550. I imagine it's to get them to shoot inside the 185 juggers?

 

[jsthntn247]

Diego, my load is at 42 also. Play with seating depth there and see what you can do. 10-20 off seems to shoot best in most.

 

[jsthntn247]

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]

Diego-Ted, how fast was 42.0 gr. load and what was the ES?

 

[diego-ted]

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

 

[ryanjay11]

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.

One of the better posts I've read in awhile. I may have to give QL another look. Thank you sir.

 

[diego-ted]

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

 

[Erik Cortina]

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

I used to use QuickLoad and OBT and it will give you an idea of where you need to be, but you still have to get out and shoot the gun to find the right load.

 

[diego-ted]

No doubt Erik.

 

[jsthntn247]

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.

 

[diego-ted]

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.

Yes I know what is optimum; however, this is an exercise to see if the move is worth while, working with the tools at hand. If I decide this is a load I want to shoot regularly and a load I expect to rely on, I will have a tube cut just for the purpose of the 215. As the comb sits today I am on the border of the donut! :-\

thx

Diego

 

[jcmckinney1]

7mm Rem Mag, H-1000, ocw testing, 26" Heavy bull 1:8.75 twist

What do you think? the F215M loads are all over the place. This is the second time I have done this test with F215M. Erik told me to try cci BR2 but could not find any so used CCI 200's.

Thoughts??

http://i938.photobucket.com/albums/ad228/jcmckinney1/7mm%20Reloading/20140927Targetpics1_zps0affd6cd.jpg



http://i938.photobucket.com/albums/ad228/jcmckinney1/7mm%20Reloading/20140927Targetpics2_zps843b8fa9.jpg

 

[284driver]

Forgive me for asking a question that may or may not have been posed in 85 pages, but do you find a difference in new brass opposed to fire formed brass? My case in question is 6br. I would imagine larger capacity cases could have a slight difference. Thanks

 

[jcmckinney1]

My first round of testing with 2x winchester fired brass with F215M produced similar results to what I just tested again with new unfired Nosler brass. If you go to my photo bucket, the other pics of the first test are on there as well. I did not see a difference.

 

[solaction]

This is a great thread. I'd like to know what your analysis is on this. I'm shooting a 22-250 with 56gr SMK and Varget powder.

 

[Bigguy1951]

I posted more detailed instructions...........
.
.

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]

Why 5 shots in this final test segment instead of 3?