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WTB-338 Lapua Redding Match Type S 3 Die set**Found**

 
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  #8  
Old 04-07-2013, 02:52 PM
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Join Date: Dec 2011
Location: Michigan
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Re: WTB-338 Lapua Redding Match Type S 3 Die set**Found**

In the competition neck sizer dies (no expander) I pay very close attention to this. I have gone to the type S as I don't neck-turn and the expander (in theory) should give me more consistent neck tension.

To make a long story short, it made me lazy. I had no idea how much springback was being built in. Your post got me off the couch to go check.

On my 338 LM set, the expander mics at exactly .336. This should give 2 thou of springback when loading. With the .366 bushing I am definitely engaging the expander (the .367 just barely engages it). In my simple mind, as long as the expander is opening up the neck on the way up, I should be good to go (ie if I sized a few thou tighter, the ball is still going to open it up to the same diameter on the upstroke). I could be wrong on this? In any case, I have had no issues with bullet movement in the magazine.

If you were going to go with no expander, .366 should give you an additional half thou or so of additional tension (assuming your brass = my brass).

Hope that helps.
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  #9  
Old 04-07-2013, 03:10 PM
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Join Date: Dec 2011
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Re: WTB-338 Lapua Redding Match Type S 3 Die set**Found**

FWIW, I have several virgin pieces on Lapua brass yet to be loaded. For giggles, I hand fit the bushings I have onto them:

.367 - slides right on
.366 - I can hand fit it, but tight (had to remove with a rubber grip and spin)
.365 - aint no way I'm pushing it on without a press

It is hard to measure inside neck diameter, but using calipers I was typically getting .335. That appears to be how Lapua ships them (about a thou under what I expect my post-expanded inner neck diameter to be).

Thanks for giving me an excuse to play with my stuff!
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  #10  
Old 04-07-2013, 03:22 PM
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Join Date: Jan 2013
Location: Northern Idaho
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Re: WTB-338 Lapua Redding Match Type S 3 Die set**Found**

Quote:
Originally Posted by varmintH8R View Post
FWIW, I have several virgin pieces on Lapua brass yet to be loaded. For giggles, I hand fit the bushings I have onto them:

.367 - slides right on
.366 - I can hand fit it, but tight (had to remove with a rubber grip and spin)
.365 - aint no way I'm pushing it on without a press

It is hard to measure inside neck diameter, but using calipers I was typically getting .335. That appears to be how Lapua ships them (about a thou under what I expect my post-expanded inner neck diameter to be).

Thanks for giving me an excuse to play with my stuff!
The .365 bushing is on B.O. at Sinclair International, so I'll order a .364 so I can load up some ammo when everything arrives. I don't mind the little extra grip, I wouldn't ever want the recoil to moves the bullets in the case.

Thanks
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