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#6898492 - 09/25/17 03:14 PM Tight in chamber after neck sizing...
Walker_clint Offline
Green Horn

Registered: 08/22/17
Posts: 6
Loc: Mount Pleasant
New to the forum, but not necessarily reloading. Question is, I have been fire forming some .338 lapua brass (Lapua headstamp), and after the first neck size and trim, some of the cases seem awfully tight when chambering, and I'm no where near touching the lands, is that normal? Do I need to get some bump dies and bump the shoulder, or will it hurt to fire them tight? They extracted fine, just a little tight, but not like an over pressure tight.

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#6898495 - 09/25/17 03:17 PM Re: Tight in chamber after neck sizing... [Re: Walker_clint]
redchevy Offline
THF Celebrity

Registered: 10/25/04
Posts: 26282
Loc: Texas
Were they all fired in your rifle previously?
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#6898506 - 09/25/17 03:25 PM Re: Tight in chamber after neck sizing... [Re: Walker_clint]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11492
Loc: Lewisville, TX
That's the risk you take neck sizing. In theory, once the brass is "fire formed" to your chamber, the brass is perfect and all you need is a neck size to hold the bullet in place. In reality, you will have cases that will chamber tight or not chamber at all when neck only sizing. If you neck only size, you will want to chamber check each piece of brass to make sure they chamber properly. If they don't, you will need to size the case body and shoulder some. You can FL size them, or do a partial shoulder bump of about .002"-.004" and this will solve your tight chamber issues. Just chamber check the brass after sizing to make sure they go in without resistance.
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#6898513 - 09/25/17 03:37 PM Re: Tight in chamber after neck sizing... [Re: Walker_clint]
Walker_clint Offline
Green Horn

Registered: 08/22/17
Posts: 6
Loc: Mount Pleasant
Can a I just back a FL die off to bump the shoulder back a couple thousandths? Or do I need a bump die specifically?

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#6898526 - 09/25/17 03:46 PM Re: Tight in chamber after neck sizing... [Re: Walker_clint]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11492
Loc: Lewisville, TX
Originally Posted By: Walker_clint
Can a I just back a FL die off to bump the shoulder back a couple thousandths?


^^^ Yes, that should work. But you have to measure the head space of the shoulder to know how much you are bumping it. In doing this, you are sizing the brass short. You can also have chamber issues related to the case web area being to wide at some point. After sizing, you need to chamber check the brass in your rifle to make sure it is working and not a tight fit.
_________________________

Custom and Precision Ammunition!!
www.DallasReloads.com
Type 01 and Type 06 FFL

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#6898568 - 09/25/17 04:32 PM Re: Tight in chamber after neck sizing... [Re: ChadTRG42]
Walker_clint Offline
Green Horn

Registered: 08/22/17
Posts: 6
Loc: Mount Pleasant
Is it worth neck sizing as compared to FL? My load I've developed was shooting under Moa@200 yards, groups at 600 are around 4-5"....

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#6898631 - 09/25/17 05:27 PM Re: Tight in chamber after neck sizing... [Re: Walker_clint]
colt45 Offline
THF Trophy Hunter

Registered: 08/19/06
Posts: 7338
Loc: bastrop county
welcome, you can get all the info you need here, some you may not want.
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