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Load development ladder test

 
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  #1  
Old 10-22-2005, 06:52 PM
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Location: Southwestern Montana
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Load development ladder test

Let me start out with the background.
243 AI, Pacnor super match blued fluted barrel, accurized ruger mod 77 mark II action, bedded in a thumbhole laminate stock. Barrel broken in while fireforming 100 rounds of mid load 4831 and a host of leftover bullets. fireforming was definately sub moa using virgin lapua brass.
Ladder test with IMR 4350 starting at listed max (41.5) for 243 win in nosler book pushing 95 gr ballistic tips. 20 rounds loaded in .2 gr increments and seated 20 thousands off the lands. I had access to a chrony but it went away when my buddy shot it and its not back in business yet.

5 foulers fired from a clean cold barrel and zero set for 300 yds. All remaining shots fired about 3 min apart and 10 min cooldown time between every 5 shots. Barrel never hot to touch.
Next 6 shots marched right up the paper from dead zero to about 3 inches high and 2 inches right.
shots 7 through 19 were all within a 3"x3" block that was very difficult to mark towards the end. There was no deffinate stringing or grouping other than within moa.
shot 18 had sticky bolt lift and 19 left extractor mark so I stopped and did not fire # 20 which was loaded with 45.3 gr powder.
I could not get a definate node so I took shots 7 through 17 and figured about 3/4 way would be #14. loaded up 50 of those babys cause I'm going hunting this week and zeroed for 100 yds.
100 yd target revealed .25" 3 shot groups when I'm doin it right so I guess I'm in business for now.
I'll let you know how I do.
Anyone got a suggestion or comment on how I should have done this test other than use a chrony as confirmation for the load I picked?
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Old 10-22-2005, 07:11 PM
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Location: west of Little Rock ,Ark.
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Re: Load development ladder test

Hey Cowboy !

Where the heck you been ? [img]/ubbthreads/images/graemlins/laugh.gif[/img] And just what in the world is someone going to tell someone thats shooting 2tenths or so at 100 [img]/ubbthreads/images/graemlins/laugh.gif[/img] IU have a load that is shooting bugholes as well and so far has shot 1 " at 300. It is 41.6 grs. H4350 under a 107 smk jumping 25 thou.

the thing is that a chrony would be great for being able to range find with a laser then dial in the moa for whatever distance . I recently got a Swarovski 1500 and that along with a palm pilot with exbal has killed a lot of far away rocks on the first shot [img]/ubbthreads/images/graemlins/cool.gif[/img]

What is your twist ? The 107smks are fantastic if you can stabilize them ( 8 twist or better I think )

Anyway , good to hear from you,

In his service, Jim
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Old 10-22-2005, 07:19 PM
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Re: Load development ladder test

jimm:

I had been wondering if you got your Swarovski and how it was working for you. Sounds like it's doing o.k. Are you happy with the purchase and it's performance?
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Old 10-22-2005, 07:25 PM
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Re: Load development ladder test

I've been real busy lately. I think I have shod every horse in the county except mine for opening day of gen rifle season. I'nm leaving tomorrow evening(opening day) for 4 days of hunting in gods country.
My twist is 1 in 10 so the 107's are to big I think but the 95's seem to work and I know 70's would be smokin. for now I'll stick with the 95 BT's unless I can get my hands on some mk's about the same weight.
Sorry I didn't get any pics of the ladder test target or the zero target. My wife's camera is out of town and I'm getting ready to be out of town. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 10-22-2005, 07:59 PM
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Re: Load development ladder test

Hey guy ,

So far so great [img]/ubbthreads/images/graemlins/laugh.gif[/img] Going on a pd shoot this coming week so will get to wring it out more . Realistically though there is nothing I can imagine that I would have a problem with.
Having said that I need to tell that if you wear glasses your eye to lens relationship is more critical than other lrf 's might be. not a big deal once you learn to adjust for it .

Jim
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Old 10-23-2005, 10:21 PM
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Re: Load development ladder test

Cowboy
In working the ladder test i use the 1% rule on the powder increments.In your case i would use 0.4 grain increments instead of the 0.2 you used and this will keep your target from getting so cluttered up.It sounds like you had around a dozen shots in a cluster and at 0.2 grains that would be roughly 2.5 grains wide.That is about 0.5 grains more than my first guess would have been but it looks pretty good to me.If you had a working chronograph you could now go near the top end of your load and shoot 3-5 shot clusters while watching the extreme spreads.Lower is better in my opinion but if they start to drop then go back up again without ever getting low enough use te powder charge at te lowest point and try different primers.
Lynn
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  #7  
Old 10-24-2005, 09:59 AM
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Join Date: Oct 2005
Location: Collin County Texas
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Re: Load development ladder test

The ladder test doesn't always produce a vertical string with visible nodes. Barrels (with residual stress left in them from manufacturing?) will string both horizontally and vertically and the resulting groups form an elipse. When I did my ladder tests I found I had to fire three shot groups at each load to get a meaningful test result. I looked for the groups that had their centers close to each other on the elipse and also had a shrinking group size.
Have you heard about the optimal barrel timing method of loading? <font color="black"> </font>
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