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338 Lapua Zero Help

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Unread 01-04-2011, 02:14 PM
Join Date: Mar 2004
Location: Danville, PA
Posts: 1,155
Re: 338 Lapua Zero Help

If the groups are opened at closer range then that amount of damage is done. The groups will not shrink is size, but can in terms of MOA. A gun that shoots 2MOA at 100 yards can be a 1MOA gun at 200 yards if the group doesn't open. But that guns groups will not magically go from 2" at 100 to 1" at 200.
I agree with how you described it. I'm not saying the groups will shrink in size but by moa it may. A 1 1/2" group at 100 yards is terrible, it's 1.5moa group. But the same 1.5" group at 300 yards now a .5moa group, that's not too bad. Who shoots a 338 Lapua under 300 yards anyway?

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Unread 01-04-2011, 02:52 PM
436 436 is offline
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Join Date: Mar 2009
Location: NorthWest
Posts: 648
Re: 338 Lapua Zero Help

I'd say go with rechecking the brake... not just for strikes.. but the design may well not agree with the cartridges pressure curve at the muzzle.. Try it with the brake off, if it's consistent no matter what the group size; then think about another brake design.
just my .02
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Unread 01-04-2011, 04:56 PM
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Join Date: Jul 2007
Location: Arkansas (Home of Record)
Posts: 1,952
Re: 338 Lapua Zero Help

I'm taking a stab in the dark on this but guessing the 3.680 is your max OAL to fit in your magazine...and you are trying to keep it a repeater instead of single loading? If that's the case you might not get your cake and eat it too. I can load the 300smk to fit in my mag but accuracy goes to h@ll. Lots of possibilities being thrown at ya. Have you spoken to the smith that put it together? Did he shoot it at all?
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Unread 01-04-2011, 07:36 PM
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Join Date: Dec 2010
Location: Elizabeth, WV
Posts: 11
Re: 338 Lapua Zero Help

I have to agree with Bravo 4. If you are forced to use a magazine then you may not be able to seat the bullet close enough to the riflings for optimal accuracy. My 338 Lapua AI would only group about 1 inch with the bullets anywhere from touching the riflings to .006 away. Finnally (after wasting lots of powder and bullets), I began seating the bullets .010 from riflings and can consistanly group both 300grn SMK and Bergers in the .2's and .3's. Just a thought.
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Unread 01-04-2011, 09:05 PM
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Join Date: Nov 2009
Posts: 136
Re: 338 Lapua Zero Help

Lots of great advice. I will work through some of it and report back. Talked to Chris as well and he gave me some thoughts. More to follow after the weekend shoot.

As for the COL. To the lands it is 3.786 and I can only get 3.680 due to the mag length. I am going to stack some to the lands and see what I get. If it improves, seekings bottom metal is in order
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Unread 01-04-2011, 11:33 PM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: 338 Lapua Zero Help

I had the same problem with a Weatherby Mark V once. After converting it to Winchester Model 70, it works great. ;-)

Good luck with all the excellent advice above.
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Unread 03-16-2011, 07:59 AM
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Join Date: Nov 2009
Posts: 136
Re: 338 Lapua Zero Help

The good news story here is the problem is solved. It took a trip back to the gun builder for him to rework the gun. "436" was correct on the brake. The brake was reamed too tight. The gun plumber opened the brake up and voilla, problem solved. Went to the range yesterday and shot 5/8" groups at 200 yards with two of the 4 loads I shot. The ES/SD leveled out and muzzle velocities increased (slightly). Needless to say I was estatic.

I almost forgot, I also got a Seekings Precision detachable magazine system put on the gun to help with the bullet length problem. Not so much of a problem now and I can stretch the bullets to the bullet-ogive magic length of 3.005. I will do some more load tweaking [seating depth] to confirm this is the optimum length.

I appreciate all the help and advice everyone gave me in helping solve the problem.
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