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.300 Lapua Mag.

 
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  #1  
Old 09-13-2004, 02:02 PM
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.300 Lapua Mag.

I'm playing with this thought.......
Can anybody tell me what to expect from this round, accuracy and velocity -vice?

Comments, please!
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  #2  
Old 09-13-2004, 03:44 PM
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Re: .300 Lapua Mag.

460Wby,

The last 338 Lapua brass I measured for volume held 116 gr of H-BLC2 filled to the case mouth.

The 300 RUM filled the same way held 117 gr of teh same H-BLC2.

If the 338 Lapua is necked down I would imagine its volume would be in the 114-115 gr capacity area.

Unless you improve this round, the full length 300 RUM will be a ballistic twin of the round and much cheaper to load for.

I admit that some brass may be larger in case volume then others, the ones I measured were once fired Lapua hulls.

All in all you would have 300 RUM performance.

Good Shooting!!

Kirby Allen(50)
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  #3  
Old 10-15-2004, 02:07 AM
 
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Re: .300 Lapua Mag.

Yeah, but the Lapua gets that capacity with - what? - 3.72"? If they're both limited to 3.6" COL the Lap may well have the edge.
And If you have the action for it, then why not go ahead and improve the thing? It's got the taper of an assault round for crying out loud!
If you're looking at heavy/long pills, they're going to plunge into that powder room in the RUM case; not so much in the Lap.
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  #4  
Old 10-15-2004, 02:15 AM
 
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Re: .300 Lapua Mag.

According to RCBS.load software, the two cases, loaded to 3.6" COL with a 1.4" long bullet, the RUM case has about 97g of water below; the Lapua has about 103g.
The way I drew the case is by simply necking down, then bringing the top of the shoulder back to the 30* point, leaving the body the same length. Of course, you could move the shoulder forward as well. And you can gain 3.5g simply by taking that "excess " taper out. By doing that, then moving the shoulder to the point of the RUM, you get a little over 116g [img]images/icons/shocked.gif[/img] !
So, it depends on what you want to do.

But to back up a bit, I would look at your rifle, how long a bbl you're thinking of, which bullet you want to shoot, and check out the RUM's ballistics. Their's faster out there, but it is a screamer as-is. And much cheaper than custom reamers, dies, Lapua Mag cases, etc.
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  #5  
Old 10-15-2004, 09:10 AM
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Re: .300 Lapua Mag.

460Wby,

I will be building a 300 Kahn this winter or spring for a customer, what would you think about that round.

Brass is a bit cheaper then the Lapua, they can both be used in the same actions and teh Kahns capacity is totally out of the league of either the RUM or Lapua or Lapua Imp.

I am getting 3100 fps with my 338 Kahn with a 300 gr Wildcat ULD bullet.

I expect the 300 version will get very close to the same with the big 250 gr Wildcat ULD.

Recoil is greatly increased over the smaller rounds though. My 25 lb unbraked 338 Kahn feels alot like my 35 lb 50 BMG with its brake. They are both pretty lively.

Good Shooting!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #6  
Old 10-19-2004, 05:26 AM
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Join Date: Oct 2004
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Re: .300 Lapua Mag.

you can check vitahvuori´s page and there you will see some theorical loads for the 300 lapua mag.
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  #7  
Old 10-20-2004, 04:39 AM
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Re: .300 Lapua Mag.

S1 has created a round called the 300Wolf that is basically a improved 300Lapua its performance with heavy 30 bullets is quite impressive.
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