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Small primer in 6.5X47 Lapua

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Unread 07-21-2008, 06:43 PM
Silver Member
Join Date: Jan 2008
Location: Missouri
Posts: 175
Small primer in 6.5X47 Lapua

Was curious why the 6.5X47 Lapua uses a small rifle primer. I see, according to the Vhitavouri reloading manual, with a 123 grain bullet, max loads call for 36-40 grains of powder. About the same as a .22-250. Seems like a lot for a small rifle primer. But, I figure the guys at Lapua know a bit more about internal ballistics than I do, so they must've had a good reason. Do most of the BR and PPC cartridges use small primers too?
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Unread 07-21-2008, 08:20 PM
Platinum Member
Join Date: Jan 2007
Location: MS
Posts: 1,652
The PPC and BR both use small rifle primers. I have had no ignition problems at all using 40+ grains of powder in the 6x47 and 6.5x47. I am using winchester primers, a lot of guys are using the cci 450 magnum primers.
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.
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Unread 07-21-2008, 08:30 PM
Junior Member
Join Date: Apr 2008
Location: Glen Oak, NSW Australia
Posts: 6
6.5 x 47 Lapua

I built a hunting rifle on the 6.5x47Lapua cartridge on a weatherby vanguard action and the combination is brilliant, the rifle drops Roos & goats very well out to the 500yds so I reckon they got the ballistics using the small primer spot on. Shane
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Unread 07-22-2008, 12:25 AM
Platinum Member
Join Date: Sep 2004
Location: on the rifle range in Utah
Posts: 2,704
When the lapua x47 was in prototype stage, it was a large rifle primer pocket. Then it was changed to a small and they found it provided better ignition and more consistency which translated to better accuracy as well.

The 6 br also went through similiar changes in it's conception. The 6ppc does also use the small primer.
Find it
Range it
Click it
Pull it
Dump it

If it's not far, it's boring.
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Unread 07-22-2008, 01:13 AM
Silver Member
Join Date: Jan 2006
Location: South Africa
Posts: 422
I don't have enough experience to be commenting from experience :-), but from all I've read, the small primer pocket handles pressure better and takes longer to loosen (i.e. better brass life). That's logical - there's more brass around the hole! Also generally (again hearsay) more consistency and accuracy. Rem made 308 Brass with small primer pockets at one time too for the accuracy nuts as I understand, although I never saw any here in South Africa.

I'm sure the guys who really know from experience will chime in.
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