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6.5/.284 die - brass question

 
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  #1  
Old 04-05-2004, 01:20 PM
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6.5/.284 die - brass question

Hi. I recently got my stick back from rebareling and I have a question about a load. Off the bat I tried some 142 MKs over 46.0 RE19 out of Lapua brass. I usually run new brass through sizer to make sure it's to spec. but this time I tried some out of box. The rifle shot in low .2s and even .1s with no brass prep at all, and those were 4 and 5 shot groups at 100 yd. After running the brass through full sizer and reloading, I can't get it to hold under 1" at 100. I switched bullets, powder, primers, went up and down the charge scale, but to no avail. Checked the rifle all out, it seems fine and tight. Dies are Hornady Custom New Dimension. Rifle has Douglas 28" match barell on a pre-64 M70 in a H-S stock with Leupold on top. After I loaded some unsized brass from the box, groups went back to one hole. What gives...? BTW I'm no benchrest or tactical shooter, just like to shoot some groundhogs.
TX in advance.
Z [img]images/icons/confused.gif[/img]
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  #2  
Old 04-05-2004, 07:58 PM
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Re: 6.5/.284 die - brass question

It sounds like your resizing dies are causing a concentricity problem. I'd check for case neck run out on unfired cases, then on fired cases before and after resizing. This should help you isolate the problem.

VH
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Old 04-05-2004, 08:26 PM
NUN NUN is offline
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Re: 6.5/.284 die - brass question

Zinger

I like Hornady sizing dies but the seating dies suck. Get a Forester Ultra seater (cheapest of the inline, micrometer seaters) and your troubles will be over. While you're at it get a Redding full length bushing sizer, mic a case with a seated bullet and get a bushing about 0.003" smaller so you won't be oversizing your brass.

If you like spending money get a Forester neck turner and just clean up the case neck. If you use Hornady brass you won't have to take more than 0.0005" of the neck to clean it up, then mic and get another bushing to fit the turned necks. Makes a lot of difference in group sizes. If you want to get into this sport more than just passing, get a case checker also, take your pick of the better names or make one if you're inclined. I have an early Sinclair, and two I made from mostly scrap stuff. They all work great and tell me at a glance when something is amiss. Enjoy
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  #4  
Old 04-05-2004, 09:48 PM
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Re: 6.5/.284 die - brass question

Sound like neck tension differences to me. If it will shoot better with unsized brass git out there and shooter'. You'll be fire forming your brass and getting bragging size groups to boot.
Seriously, your resizing die may be giving you too much neck tension. Measure the inside neck diameter of an unsized case and then measure inside dia. of a resized case and see what ya have. Will be looking for your post. Johnny K.
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  #5  
Old 04-06-2004, 06:22 AM
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Re: 6.5/.284 die - brass question

Zinger

the Forester BR seater is the best seater for the money. Forester also makes a BR sizing die that is very good. I send mine off to JLC precision (jlcprec@netins.net) and that is Jim Carstenson. He makes very good custom dies and for $35 he will convert any die to bushing, either Redding or Wilson. That is best way to go. Will solve concentricity problem on necks and using an inline seater that should cure it.

You either have a very big problem with concnetricity or neck tension. Either way, that will cure it.

As for neck turning best neck turner is the K&M. I have the Forester and it is a pain in the butt compared to the KM.

BH
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  #6  
Old 04-06-2004, 07:26 AM
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Join Date: Apr 2004
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Re: 6.5/.284 die - brass question

Guys, thanks for replies. Johnny, I got to get another batch of brass to measure. I had 50 and fired them all during this ordeal so I have no inside dia. on new stuff. I'm getting more, will let you know. Talked to smith, he says might have thick necks and to try sliding bullets in after firing. I did and they go in relatively easy. Varmint H., is there another way to check runout? I have no runout gauge.
I also thought sizing die might be the culprit. I'm getting a Forester seater, and probably a Redding sizer. Should I only go with neck sizer? I've no experience with bushing dies. Thanks again VH, BH, BT and JK.
zinger
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  #7  
Old 04-06-2004, 01:45 PM
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Join Date: Apr 2004
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Re: 6.5/.284 die - brass question

Johnny K. here's some numbers I come up with. New brass ID .252".
Once fired ID .268".
Sized case ID .262".
Loaded round OD .295".
From the advice I got sounds like I need a bushing for size .292". Will be ordering dies tomorrow.
zinger
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