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which .338??

 
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  #1  
Old 11-21-2001, 05:23 PM
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Join Date: May 2001
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which .338??

Darryl has already given me some advice but I thought maybe the rest of you could offer an opinion. This spring I will be building a 338 caliber, heavy rifle for ultra long range hunting. My goal is to achieve a MINIMUM of 3,100 fps. with the 300 MK. I want to use a beltless case and do not want to fireform. As far as I know, this limits me to the 338 Ultra mag, 338 lapua, and 338 Excalibur. I know the Excalibur would give me the performance but it's an exotic and brass may be hard to come by. I am leaning towards the Lapua but want to make sure I could get the velocity without too much trouble. I will use a barrel of 36 to 38 inches long and a Hall action. Any input would be appreciated.
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  #2  
Old 11-21-2001, 06:15 PM
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Re: which .338??

I had similar discussions with DC ( the guys knows his $hit doesn't he) Correct me if I'm wrong but arn't the 338 Lapua and 338 RUM just about the same thing???? I almost went with the 338 but later decided I didn't want the pounding. I had narrowed it down to the RUM because the brass will be cheaper and the the same performance as the lapua. It will only be a matter of time before better brass than rem. will be available.
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Old 11-22-2001, 08:09 AM
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Re: which .338??

I believe 338 Lapua holds more powder than 338 RUM because 338 Lapua uses 416 Rigby case while 338 RUM uses .404 Jeffery case. Am I correct?
P.S. I don't think you can acheive 3100fps with 300gr MK,probably closer to 2900. Am I correct again?
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  #4  
Old 11-22-2001, 08:25 AM
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Re: which .338??

The Lapua is based on the 416 Rigby only shortened a bit. The Ultra is the 404 as you said. The Excalibur is a new case, .580 at the head and actually holds a bit more powder than the 378 Weatherby. I would be using a 36 to 38 inch barrel to hopefully obtain the velocity needed. I'm leaning towards the Lapua because of the quality of brass.
Thanks for the responses.
Anyone else have a thought?
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  #5  
Old 11-22-2001, 08:43 AM
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Posts: 180
Re: which .338??

PT,

I own a 338 Lapua and have owned a 338RUM. Personnally I like the Lapua better, for the reason you stated of brass quality. Both cartidges are very accurate. You should be able to get the velocity you desire out of both rounds with the barrel length you stated. If Winchester or Federal would make 338 RUM brass, I probably will have another, but until then I'll stick with the Lapua. My two cents for what it's worth, hope this helps.

Jim
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  #6  
Old 11-22-2001, 08:51 AM
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Re: which .338??

Prime

Using the 338/416 Rigby Imp Case, I can get 3300 FPS with a 37" barrel and 122.5 grs of WC-872 powder, if I don't care about loading my brass more then 2X.

Slowing it down to 3100 to 3200 FPS (which is really all you need with that bullet) and the brass survives several loadings. 117.5 to 118.5 Grs works just fine and will repeat shot after shot and saves brass.

Any case with the powder capacity of 117 to 122 Grs of WC872 powder (like H870) of powder with a very slow burning rate, will get that speed when you use at least a 36 to 40" barrel and using the 300 gr Sierra MK.

I stay clear of powder such as 5010 (large stick powder) because of the barrel eating charteristics I have seen done to 30/378s using that stuff. I've seen barrels shot out (lands gone 6" up the barrel) after 600 rounds using it.

I know of two fellows shooting the 338/378 and 300 gr bullets with a 36" barrels maintaining 3155 FPS and I believe they are using RL25 in the one and WC872 in the other.

With barrels that long, it is not to hard to run the 300 gr bullet at 3100 FPS--Plus.

One fellow at Williamsport ran his with a 40" barrel to 3350 fps. and had no extraction problems what so ever. His was on the BAT action. I was there when he shot it over the Oehler Chronagraph and even raised the bolt on one of the fired cases to see if it was sticky at all. There were NO problems and it was about 75 degrees that day.
Same group of guys that got their elk at 2890 yards the year before with another 338/416 Rig. Imp.====You may know who I'm talking about. Beat the hell out of my 2100 yard elk shot that I had got two years before that.

My 338/416 Rigby IMP has the Hall "G" action, a Jewell trigger and a 37" K&P barrel. It has always worked fine for me.

Good luck in your project.
Darryl Cassel
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  #7  
Old 11-23-2001, 07:52 AM
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Join Date: Nov 2001
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Re: which .338??

DC and 338 Lapua, you are both correct about the velocity that be reached at 3100. I guess I was thinking of 24-26 inch barrel. Gonna read carefully next time. I'll order a 30" or 32" barrel in 6-8 months. At that length, I would say it would give around 2900 to 3000? (with 300 MK). I'm a little worried about fitting it in the travel case. Something like Pelican 1750 Travel Vault. It's dimension is 50.75x13.5x5. Do you create homemade carrying case?
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