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Strange day on the ladder test

 
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  #36  
Old 02-27-2006, 10:07 AM
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Re: Strange day on the ladder test

Either will give you an idea, but I like a 5 shot group. Just let the bbl cool between shots.

Let us know how it does. Either I'm going to look smart or like a dumb@ss!!! I'm leaning towords the latter. [img]/ubbthreads/images/graemlins/blush.gif[/img]
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  #37  
Old 02-27-2006, 10:40 AM
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Re: Strange day on the ladder test

Sean, I appreciate you looking at the OCW webpage. If you don't want to read through the theory, just go right to the OCW load development instructions on page one, print them off and do a round robin test. Here is a piece I wrote on the "scatter group," and its significance during OCW load development--and also the effect of the scatter group on a conventional ladder test: http://snipersparadise.com/snipercha...howtopic=13860
Also, I think if you'll read over some of the posts and look at the target photos in the Handloading and OCW section here--> http://practicalrifler.6.forumer.com/ ...things will begin to make more sense.

Roy, thanks for the encouragement. [img]/ubbthreads/images/graemlins/smile.gif[/img] And by the way, the front of my Chrony looks just like yours! I did that with RL22 in a 6.5 x 55 Swede... the chronograph was ten feet from the muzzle. I asked the Chrony folks about the issue and they advised me to place the chronograph 15 feet from the muzzle for cartridges which exceed 3000 fps (true, the Swede wasn't going anywhere near 3000)... just an inefficient powder burn...
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  #38  
Old 02-27-2006, 01:39 PM
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Re: Strange day on the ladder test

srhaggerty, If the guys are done argueing I'll read your test.

The 75gr load 1st target.

Shots number 15,16,17 shot into about .5" at 300 yards with a velocity spread of only 21 fps. This is so obvious don't let it bite you in the *****. [img]/ubbthreads/images/graemlins/grin.gif[/img] Load up with 58.8 grains and shoot some groups.

The second target

Shots 8,9,10 look to be about 1/2 MOA. But the velocity spread is 85fps. Ignore that velocity for now load up 49.7 grains. Shoot and record your velocity and check group size. If this load groups well and velocity is a little inconsistant do one of 2 things; change your seating deapth slightly "experiment", Or change your primer. Do one or the other not both at the same time.

When I load a promising looking load I make at least 10 rounds, that way I shoot them on 2 different days. Sometimes I just have a difficult day concentrating or whatever and reshoot the load another day.

I hope this helps.
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  #39  
Old 02-27-2006, 04:48 PM
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Re: Strange day on the ladder test

Coyboy,

I can't argue with your logic on the first target. 58.8 grains might be where to be... It will be interesting to see if the recipe repeats. There should have been at least two accuracy nodes in that string, however.

On the second target (125 grain bullet) it may be that the barrel just isn't going to get along with that bullet. I don't see anything to hang a hope on there...

Dan
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  #40  
Old 02-27-2006, 07:33 PM
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Re: Strange day on the ladder test

Hey Green ,

Your remark on the 125 bullet just not cutting it with this bbl could be the deal. However he could change the seat depth radically in one direction or the other and find a load that will shot this bullet .

Just a thought , Jim B.
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  #41  
Old 02-27-2006, 08:17 PM
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Re: Strange day on the ladder test

Jimm,

The only published data I have on the 25/284 is in the Hodgdon Annual Manual. It shows their max of H4831 at 49.0 grains with the 120 grain Nosler Partition. From a 26" barrel, they were getting 2978 fps at max pressure with the 120 grain bullet.

I'm thinking that slowing the 125 grain bullet down and going to a slower powder with better case fill (but lower pressure) might get that bullet looking better.

3000 fps for the 125 grain bullet would sound about right--I would think.

I would try 4831, either Hodgdon or IMR. They're not really slower than RL22, but may end up working better here. The RL22 does not appear to be promising with the 125--but it could simply be that the charge weight range and velocity are too high...

Dan
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  #42  
Old 02-28-2006, 07:56 AM
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Re: Strange day on the ladder test

green 788, The 125 vld load does not look real good, but he may be able to salvage something from it. If not an accurate load then maybe a little experience. I also agree if he continues to have trouble with Rel 22 and that bullet he should try a different powder. Don't over look H-1000
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