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260 w/130g VLD load developement

 
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  #15  
Old 12-02-2013, 07:40 PM
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Location: NSW, Australia
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Re: 260 w/130g VLD load developement

Yeah, from what I've heard and read they can be frustrating until you find the sweet spot. I fired some test groups of loads varying from 44.5g to 46g and they open up the higher the charge. I've got the bullet approx. .010 off the lands. I was surprised how open the groups were. The best was 44.5g at 1.6" (155 meters). Others were out to 3"!! That is from a bipod (not loading it...should I be??) and no rear bag). I think my form on the day had a bit to do with it so I'm going to load some 44.5g at varying depths (.010 in, 0, .010 off, .020 off and .040 off) to see what that tells me......
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  #16  
Old 12-03-2013, 12:33 PM
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Location: Meridian, Idaho
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Re: 260 w/130g VLD load developement

I would personally not get too excited about the group until you find the max charge weight. If you at max and back off a little I would then try for some seating depth testing. I tend to start with a seating depth around .02 to .05 to keep pressure at lower level then .010 or to the lands. That way I find the max safe pressure first. If I get luck and find accuracy then that is a bonus.

A couple weeks ago I got lucky with a 7mm08. Used .020 as a depth to start and incremented powder up 1 grain from min to find the max. The rifle was very accurate toward the max charges and at that seating depth. I am hoping further testing proves easy.
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  #17  
Old 12-03-2013, 02:22 PM
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Re: 260 w/130g VLD load developement

Hi Brent
Whats your deffinition of 'max charge'? I am at 44.5g of AR2209 (H4350) which is above the book max. I have tested to 46g with no issues in regard to pressure but accuracy seemed to be suffering. That being said, 46g was not the max capacity of my case and I suspect I could load up to around 48.5g based on cartige capacity before the loads become compressed. I didn't see any point going above 46g when the groups were increasing with charge, is that a rookie error? Is it possible that the groups could come back in as I approach a charge closer to the cartige capacity?
Cheers mate
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  #18  
Old 12-03-2013, 02:56 PM
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Re: 260 w/130g VLD load developement

Quote:
Originally Posted by zane243 View Post
Hi Brent
Whats your deffinition of 'max charge'? I am at 44.5g of AR2209 (H4350) which is above the book max. I have tested to 46g with no issues in regard to pressure but accuracy seemed to be suffering. That being said, 46g was not the max capacity of my case and I suspect I could load up to around 48.5g based on cartige capacity before the loads become compressed. I didn't see any point going above 46g when the groups were increasing with charge, is that a rookie error? Is it possible that the groups could come back in as I approach a charge closer to the cartige capacity?
Cheers mate
There is book max and there is cartridge max. I never exceed book max unless the case and action of the rifle are telling me everything is safe. I read primers, case head marks from the extractor, and bolt lift. I also chrono loads to see if speed increases or remains the same with increases in powder. On the other end of things I have had cases indicate book max is not achievable as I get pressure signs before I reach said max. For example, cratered primers, extractor marks, and sticky bolt lift. This is a NO GO area for me.

So if you are above max and not getting accuracy then my guess is you should back off as well and play with seating depth. .010 is nice place to start. My LR rifle likes .075 to .100 off the lands with Berger VLD Hunting bullets and 160 Matrix. It likes .010 to .015 with Match bullets, which have a shorter bearing surface. Just saying you never know what your rifle might like. Don't be affraid to jump that bullet though. You might be very surprised at the results. My 204 likes .100 as well. It shoots .15 MOA at .100 and .150 off. Crazy.
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  #19  
Old 12-16-2013, 01:29 PM
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Re: 260 w/130g VLD load developement

Nice looking rifle you have there

I ended up with this for my 260 w/ berger 130 hunting vlds

OAL 2.875, no feeding issues in AI mag
44 gr Hodgons H4350
Federal 210M primers
2790 FPS, 20" tube
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  #20  
Old 12-22-2013, 07:33 PM
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Re: 260 w/130g VLD load developement

Without looking at my notes, I think I was using 43.6 or 44.3 gr H4350 with 130 hunting VLDs depending on brass brand. My throat was cut so that I could put them in the lands at mag length, but I still jumped them .030. They shot great.
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  #21  
Old 12-26-2013, 10:51 AM
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Re: 260 w/130g VLD load developement

You seems to be in a safe range. I use the same basic range and even a bit more with 140s so you should be ok but please watch for pressure. When I start out I find where I want to be seated for vlds it's usually into the lands as this will give max pressure for a given powder charge generally then I load 10 or so rounds building up from very conservative to not so conservative in small increments looking for the first sign of pressure (usuallyejector marks then primer flattening. I then back off the first pressure sign by about .5 grains for a cartridge like the 260 and use that as my max charge then go down from there in 5-9 increments of .3-.5 grains and shoot for groups you should find prob at least 2 accuracy nodes in there then chrono the good ones and take your pick. You can also kill two birds with one stone on the pressure test part by doing a ladder test simultaneously at 300+ yds which will likely help you find a good vertical node that you can recon firm with groups. Then play with seating depth to fine tune it and again in most cases if you start into the lands seating the bullet further into the case will decrease pressure. As for into vs off the lands there is a great thhread about getting the vlds to shoot well off the lands here on this site.
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