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Lapua speed's

 
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  #1  
Old 02-05-2010, 07:47 PM
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Lapua speed's

What will a Lapua shoot for FPS with a 300 gr SMK and a 30 inch barrel with brake?
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  #2  
Old 02-05-2010, 07:52 PM
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Re: Lapua speed's

Roughly 2925 with max loads. We are getting 2960avg with a 32".

Tank
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Old 02-06-2010, 12:05 AM
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Re: Lapua speed's

Quote:
Originally Posted by TheBlackPearl View Post
What will a Lapua shoot for FPS with a 300 gr SMK and a 30 inch barrel with brake?
Mine has a 271/2" barrel and is right at 30" with brake. I get 2850 with ease and My brass is still looking great after
7 firings.

I should add that my chrony says it is just over 2900. But I don't trust cheap chrony's. 2850 is what works for drops with my exbal program and I think that is closer to reality.
Jeff
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Old 02-06-2010, 12:35 AM
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Re: Lapua speed's

I have two 338 Lapuas now and have built several for others. Also a bunch of 338 ultramags and 338-300 ultramags or some call edge on here. All of them are the same with the individual barrels being the difference. You will top out between 2800 and 2900 fps with all three with 30" barrels.
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Old 02-06-2010, 01:44 AM
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Re: Lapua speed's

+1 on what Broz says - my 338 imp Lapua w/ 300SMK and 98 gr Retumbo gets 2925 on Chrony, but 2850 works with exbal on 29in barrel. Haven't tried for more, wanted to stay under pressure as it is built on a700 action.
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  #6  
Old 02-06-2010, 05:05 AM
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Re: Lapua speed's

At school I was always the slow one, looks like same applies here

My chrony average is only 2740 but deadly deadly accurate!

As the saying goes "velocity is something, accuracy is everything!"

My mates Edge humms out the 250gr Senar at a blistering 3300 fps ! easy.

I thinks he did alright at school too

Take everyone who has posted an average and work it out from there, it will be pretty dam close.

For what its worth if I was to build another 338 it would be an 338-300RUM aka an Edge, theyre pretty wicked IMHO.

Regards 300WSMMAD
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  #7  
Old 02-06-2010, 12:56 PM
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Re: Lapua speed's

I shoot a .338 ultra mag, and when doing load developments I was getting an average of 2865fps over three shots with the 300 smk. the load shoots nice groups but I'm wondering if that seems a little on the fast side. I single load so my OAL is 3.830" with 94 grains of Retumbo. temp was 6 degrees Celcius (I have no idea what that is in F) . elevation 2900'. Could it be that I have a fast barrel or is my chrony most likely inaccurate? I was also getting 3390 fps with 210 TTSX's.

Sorry for kinda off point, but it seemed close enough
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