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Posted: 8/8/2012 1:13:57 PM EDT
I placed this here since HP shooters may have more of the answer.

I have some 80 gr. AMAX bullet that I will load for the 600(single) Have the Stoney Point OAL gauge to measure.

Question is, How far off the lands should I start and in what increments should I go during testing?

I more or less wanted a second opinion on my approach. I was told to start .005 off, go back(shorter) in .005 increments for 4-5 different lengths with the medium suggested powder charge. Once I find the most accurate length, tweak the powder charge to a safe/desired level.

Plan on using Varget with CCI BR4 primers and LC cases, any suggest charge weights?

I certainly appreciate the advice. If it matters, Wylde chamber.

Mark
Link Posted: 8/8/2012 10:37:43 PM EDT
I caught your post in the reloading section too, I linked you to the NJ Highpower page.

If you have the Stoney Pointe tool, you could sample several bullets and get an idea of you cartridge length to touch lands with several bullet designs.
Then you could see which ones give you a decent seating depth and case fill volume relationship for your particular chamber reamer.
Some VLD designs have a very different ogive and you could find that different brands and designs are very different in terms of seating to the lands.

You shouldn't have too much trouble finding the recipe for performance if you do a work-up carefully.

Here is another link you may find helpful in addition to the one from NJ Highpower.

http://www.whiteoakprecision.com/info-reloading.htm

Link Posted: 8/10/2012 5:18:49 PM EDT
I like to just kiss the rifling. Most rec .020 off.

John
Link Posted: 8/11/2012 3:20:01 AM EDT
Sounds great, anyone try the ARcomp or 2000 MR powder yet?

http://www.alliantpowder.com/products/powder/ar_comp.aspx

http://www.alliantpowder.com/products/powder/power_pro_2000.aspx

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=31&cartridge=46

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=35&cartridge=46
Link Posted: 8/11/2012 8:02:40 AM EDT
Quoted:
Sounds great, anyone try the ARcomp or 2000 MR powder yet?

http://www.alliantpowder.com/products/powder/ar_comp.aspx

http://www.alliantpowder.com/products/powder/power_pro_2000.aspx

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=31&cartridge=46

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=35&cartridge=46


I know one person who has tried AR comp and got poor results.

No reason to use anything other than Varget or RE-15. Pick about 24 grains of either one, seat a Sierra 77 or 80 and practice. There's your load development.
Link Posted: 8/12/2012 12:32:53 PM EDT
True, but doesn't hurt to ask to see if others have used it and if it worked well or not. My understanding is that the two are supposed to be product improved versions of the R15.
Link Posted: 8/12/2012 12:53:35 PM EDT
It might be –– buy a pound of each and try it.

I've shot three or four 8-pounders of Varget and like it better than Reloader 15, VV N135, and Tac.  I've had friends who shot 4895 and 4064, but it seems Varget is the "Go-to" powder.

24 is about the middle I shoot with 73s, 75s, and 77s.  I shoot 24.5 with a Tubb Carrier Weight, and have used up to 25 with 80-grainers for the 600.
Link Posted: 8/12/2012 3:42:54 PM EDT
Quoted:
It might be –– buy a pound of each and try it.

I've shot three or four 8-pounders of Varget and like it better than Reloader 15, VV N135, and Tac.  I've had friends who shot 4895 and 4064, but it seems Varget is the "Go-to" powder.

24 is about the middle I shoot with 73s, 75s, and 77s.  I shoot 24.5 with a Tubb Carrier Weight, and have used up to 25 with 80-grainers for the 600.


What cases did or do you use? I have once fired LC cases that I have ready for the 600. I'll have to start a bit lower and work them up. I really don't want to "hot rod" the loads.

My bullets should be in Tuesday, so I can start working on these soon. I have a match on the 25th and will use some 77's that a buddy gave me to get running.

Mark
Link Posted: 8/12/2012 3:53:48 PM EDT
Lake City for the short lines, Winchester commercial for 600.  The commercials have just a tiny bit more capacity, plus I can sort them easier.
Link Posted: 8/14/2012 12:43:08 PM EDT
Quoted:
Lake City for the short lines, Winchester commercial for 600.  The commercials have just a tiny bit more capacity, plus I can sort them easier.


Sounds great! I have some work to do now.
Link Posted: 8/14/2012 6:52:12 PM EDT
Do not spend too much time on load development.  Hone every aspect of your prone position and wind reading.  I have seen AMU team members shoot 197 on a windy day with Black Hills ammo with 77 SMK.
Link Posted: 8/15/2012 3:54:31 PM EDT
Quoted:
Do not spend too much time on load development.  Hone every aspect of your prone position and wind reading.  I have seen AMU team members shoot 197 on a windy day with Black Hills ammo with 77 SMK.


Copy, sound advice.
Link Posted: 8/18/2012 3:51:27 AM EDT
I called Hornady for their data on the 80 AMAX and R15 20.4-23.5, 2300-2650 velocity bracket. .020 was the suggested jump. I loaded 22, 22.5, 23 and 23.5, 23.5 was the most accurate at an average of 2614. No pressure signs and counting a called shot(5) group was 1.7, without .985. I might load up another set of 23.5 and possible 23.8, a buddy has that load and has no issues.

Tested rested on a pack, irons of course.

Now if I could hit on the standing off hand!
Link Posted: 8/18/2012 8:51:41 AM EDT
RR 24"
LC69 cases
24 grs RL15 thrown
80 gr a-Max Jumped .025
10 shot group @ 300

Link Posted: 8/18/2012 12:39:17 PM EDT
Pretty good, some wind and a scope I presume?
Link Posted: 8/18/2012 1:30:53 PM EDT
Thats a 300 yard reduced 600 F Class target
Florida mirage
Scope was Weaver T36
That was 2K rounds ago
With over 4K down te tube she will not do that any more
She will still shoot a low 140 something with a 15 rd string
Link Posted: 8/20/2012 12:00:06 AM EDT
Quoted:
I called Hornady for their data on the 80 AMAX and R15 20.4-23.5, 2300-2650 velocity bracket. .020 was the suggested jump. I loaded 22, 22.5, 23 and 23.5, 23.5 was the most accurate at an average of 2614. No pressure signs and counting a called shot(5) group was 1.7, without .985. I might load up another set of 23.5 and possible 23.8, a buddy has that load and has no issues.

Tested rested on a pack, irons of course.

Now if I could hit on the standing off hand!


A common load is 24.0 RE15 for 75-80.  With the loads you mentioned, I'm not the least surprised there were no pressure signs.  I'm sure Hornady's data is at their OAL for the 80 AMAX, not a measured one.  


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