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338 Lapua reamer question

 
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  #1  
Old 06-05-2007, 03:09 PM
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Join Date: Mar 2007
Location: MD
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338 Lapua reamer question

I'm trying to decide on the neck size. I don't have a loaded round to measure nor am I sure on how much clearance I should have. Gun will be set up for 300gr MKs. Thanks in advance for any help.
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Old 06-06-2007, 08:55 PM
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Join Date: Jul 2002
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Re: 338 Lapua reamer question

I have a loaded round diagram that another member here posted for me that shows the neck diameter being .372" at the neck shouolder junction and .370" at the case mouth.

I would get the gun chambered with a match quality reamer thats cut to the 338 Lapua specs , this way you will be able to shoot factory ammo if you get in a bind. As for the reamer being made for the 300gr SMK bullet , the throat section can be lengthened to seat the longer bullet out further with a throating reamer and if your gonna have this done you might want to check into what is a better lead angle this will help with pressure and accuracy. I think Kirby Allen did some test with diggerant throat leads with his Allen mag rounds when he was developing them.
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  #3  
Old 06-12-2007, 11:46 AM
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Join Date: Dec 2002
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Re: 338 Lapua reamer question

[ QUOTE ]
I have a loaded round diagram that another member here posted for me that shows the neck diameter being .372" at the neck shouolder junction and .370" at the case mouth.



[/ QUOTE ]

Iīm measuring a factory (Lapua Scenar Moly) round at the moment and it shows .3715 at shoulder and .3695 at the case mouth.

Iīd stick with the factory specs as well.


(I should do something about my TRG-S 338 LM, itīs been "re-stocked , under construction" for all too long. Nothing has happened, there is a carbon fibre stock of some kind but thatīs it. When I finally got a rucksack full of Lapua brass and hundreds of different bullets - my stock broke. I miss it, sort of. It actually worked for a while. [img]/ubbthreads/images/graemlins/confused.gif[/img] )
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