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.284win neck turn question

 
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  #8  
Old 05-20-2012, 07:00 AM
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Re: .284win neck turn question

Two things that can cause irregular velocity are weak firing pin springs and insufficient firing pin protrusion from the bolt face. I don't know what your action's firing pin spring's rating is supposed to be but firing pins need to stick out .060" to .065" from the bolt face.

You might try IMR4350 powder and see if that helps. Slower powders sometimes have higher velocity spreads in cases the size of a .284.
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  #9  
Old 05-20-2012, 07:18 AM
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Re: .284win neck turn question

I was having a similar problem with my .25-06AI tight neck. Drove me nuts for a while. I finally moved up 1.5 grains in half grain increments and noticed two things. 1 the ES got smaller and 2 the soot ring went away. Not sure that is your problem but it took care of mine. I was using Retumbo powder which is considerably slower so you might not have to go up that much but it will also depend on where your pressure signs show up. Sometimes a faster powder helps too. I also do not like less than .0015 clearance per side either. If you get some soot build up it can actually make it too tight. I will also fire a couple shots through the gun just to get things settled in on a clean bore prior to shooting for group or over the chronograph.
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  #10  
Old 05-22-2012, 07:09 AM
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Re: .284win neck turn question

Your rig is nearly identical to the one my brother built. He and I shoot frequently, so I have shot it a ton. He runs H4831SC, Berger 180 vlds, but uses Fed. 210Ms for primers.

I have no problem with the burn rate of the powder, given how well my brothers runs. Nor do I have a problem with the neck clearance, as my custom chambers run the same 0.0015 per side. I am not a big fan of trying to seat "touching" the lands. For me its either jump them or jam them, no in-between.

Since you didn't post a picture of your fired brass, I'll go ahead and ask - did you turn the necks all the way into the shoulder? if not you have a doughnut on the back end of the neck. If you are seating down into that doughtnut, it will create problems.

+1 - once you settle on a load, then you tweak the seating depth (both in and out) to see if you can hone it even further. For me, with my .313 neck (.310 loaded rounds) 7WSM shooting BErger 180 VLDs, there is a huge accuracy change between "touching" (1+MOA) to 0.015 jammed (bugholes). My brother's .284 reacts the same.

if you've never jammed before, make sure you reduce the load and work up; its a different world.

Jeffvn
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  #11  
Old 05-22-2012, 07:34 AM
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Re: .284win neck turn question

Today, I seated the bullets 20 thou off the lands in brass that had an extra 1 thou turned off the necks (right down into the shoulder). Charge was bumped up to 54gn and the difference was amazing.
The rounds chambered and extracted easy, and the velocity ES was back to normal levels. Speed was 2770 fps and accuracy for 5 shots was 1/2" so one of these things worked.
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  #12  
Old 05-22-2012, 08:01 AM
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Re: .284win neck turn question

Probably a combination of more than one thing. The hair jerker is which one but then why worry as it sounds like the problem has gone away.
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  #13  
Old 05-22-2012, 10:29 AM
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Re: .284win neck turn question

Inconsistent neck wall thickness may contribute to MV ES/SD.

Turn the least amount possible (80-90% cleanup) unless you have a tight necked chamber which you don't have.

Any more than necessary is counter productive.

-- richard
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