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.30-378 Wtby Mag vs .30-338 Lapua Mag vs .300 RUM vs .300 Jarrett

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Unread 02-09-2007, 11:41 AM
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Join Date: Feb 2006
Posts: 76
Re: .30-378 Wtby Mag vs .30-338 Lapua Mag vs .300 RUM vs .300 Jarrett

You guys are very informative and now I'm looking into the Allen Magnums. Just so more research.


Your happy with your RUM. That's cool. I have shot one many times and in the beginning it was my first choice, but I slowly come up with other choices to look into. Now that being these Allen Magnums. I guess I need to quit bugging all of you and just start searching the archives.
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Unread 02-10-2007, 10:18 AM
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Join Date: Jan 2007
Location: Great Falls, MT
Posts: 203
Re: .30-378 Wtby Mag vs .30-338 Lapua Mag vs .300 RUM vs .300 Jarrett

Good luck!!! I'm sure I will soon follow in your enviable footsteps.
Genises 27-3: Now therefore take, I pray thee, thy weapons, thy quiver and thy bow, and go out to the field, and take me some venison...
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Unread 12-10-2008, 08:20 PM
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Join Date: Dec 2008
Posts: 2
Re: .30-378 Wtby Mag vs .30-338 Lapua Mag vs .300 RUM vs .300 Jarrett

You may want to start by taking a look and compare Weatherby's TRR chambered in 30-.378 or 338-.378 vs. Sako's TRG-42 chambered in .338 lapua. The WBY 30-.378 actually has a bullet diameter of .308 but also has a larger case capacity then the .338 Lapua. (30-378 Weatherby Magnum | Norma Precision - ammunition) vs.

(338 Lapua Magnum | Norma Precision - ammunition). This may be benificial if the right hand load could be determined, meaning: Very Fast and Flat shooting. However, given its a smaller diameter bullet; cross wind at 1000 yards and beyound could prove to be anoying. This is where the larger .338's are more advantagous in that they are of heavier wieght bullets, typically 200-300gr, thus hold over (or clicks if your a clicker) for cross wind is a lot less.

Despite the fact that the Wby .338-.378 has nearly identical ballistics as the .338 Lapua; your honest best bet is probablly the Sako TRG-42 in .338 Lapua(SAKO TRG-42). On top of the fact that the .338 Lapua has finominal ballistics out to 1500-2000 yards and not to mention is the choice caliber for the US Marine Corp Snipers (excluding .50 cal BMG of course) and the Canadian Black Ops Snipers (Some of our Canadian snipers have confirmed kills at 2000y using the .338 Lapua); the entire gun itself is fully adjustable and has lots of add-ons. It goes for about $3000.00 CAN. Of interest; the Weatherby TRR ( goes for about $2800.00 CAN.

For the extra $200.00 bucks I would definetly go for the Sako TRG-42 .338 Lapua. For what Sako is offering in a factory made rifle $3000.00 is more then a fair price. If you've got deeper pockets then you can always build a rifle for in and around the $6000.00-$9000.00 mark and bare in mind you haven't even put optics on yet!! In regards to features and benifits; Sako really did go all out to give you everything you need to get started in long range shooting.

Hope this helps or least points you in the right direction. Here is another awsome link that answeared a lot of my questions, this should really help you out a lot: PRACTICAL LONG-RANGE RIFLE SHOOTING - PART I: THE RIFLE & GEAR
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Unread 12-10-2008, 10:58 PM
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Join Date: Mar 2007
Location: Montana
Posts: 2,453
Re: .30-378 Wtby Mag vs .30-338 Lapua Mag vs .300 RUM vs .300 Jarrett


When I built my rifle, I like you came here for advice. I wanted to build a 30cal as well. My rifle started out a stock Sako 995 in 30-378. I was going to re barrel the rifle w/ a 30" tube in the same cal. It was suggested to me to make it a 300RUM. I couldn't because my bolt face was too large. Kirby came on and suggested that I chamber it in 30-338lap imp. This is basically a ballistic twin to the 300 Allen Express. Kirby's is slightly bigger. I get a little more out of this rifle than a 300rum, brass lasts considerably longer than the Weatherby brass.

I am currently shooting the 180 E-tip. My barrel is 30" Lilja. MV is 3600fps, 1500yrd vel is 1377fps w/ 757ft lbs energy. 240g SMK out of this rifle will arrive at 1500yrds w/ 1564fps and 1303 ft lbs energy.

If you don't mind the time that has to be spent loading the wild cat, I recommend it. If you go w/ Kirby's 30 cal he can supply you with fire formed head stamped brass, and all you have to do is load. The 30-338 lap imp is the best 30 cal over bore going in my opinion.

If I had it to do over, I would consider a faster twist than the 1-10 that I went with. The new high b.c. bullets and mono metal require a faster twist in order to perform correctly. I believe the mono metal bullets are the wave of the future and should be considered when planning your new rifle. Good luck, and let us know what you decide.

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