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338 comparisons

 
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  #1  
Old 03-24-2010, 08:04 PM
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338 comparisons

Has there been a post comparing the speeds obtain with the 300SMK in the following pistols:
338 AX
338 EDGE
338 Norma
338 Lapua
338 WM
It would be interesting to see some comparisons on performance.
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  #2  
Old 03-24-2010, 09:24 PM
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Re: 338 comparisons

Im getting just over 2700 fps with the 300g SMK in my 338 Nawakwa (338 lapua IMP) 18" barrel

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Old 03-24-2010, 09:26 PM
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Re: 338 comparisons

Im getting 2700 fps with my 338 Nawakwas (338 lapua IMP) 18" barrel



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Old 03-24-2010, 09:27 PM
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Re: 338 comparisons

dubble post
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Old 03-24-2010, 09:55 PM
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Re: 338 comparisons

I agree: I too would like to see a comparison that is fact based.

All cartridges would have to be shot across the same chrony for one. I personally have two chronographs and one reads 50fps faster than the other regardless of cartridge or caliber. I have a friend with a very expensive Chronograph and I love shooting my stuff across his Chrony because his always reads 100fps faster than my faster Chronograph. All of my published data is from my slower Chronograph because to date and from experience of doing this type of stuff for the past 30 years I just do not think some of the velocities being obtained by me or others are obtainable.

An example of this: my 19" Edge shooting a 225gr Accubond is within 6fps spread at 2957 Average,

Another person comes along with a shorter barrel with slower burning powder and obtains a velocity 150fps faster with the Edge or equal case capacity cartridge to the Edge! Mathematically that is not possible. SO I must presume one of two things. Presuming the first, I change my powder type to what they are publishing and Bam, I instantly lost 100fps.
When I first decided to put the Edge in a handgun I had read all the data from everywhere. Before I built, I gave data to someone I trusted in Canada to project the burn rates of H1000 and H4831 with the above data. It was easy to choose H4831. After firing and reporting here and other places I asked a friend in the midwest to calculate and crunch my data. Neither one till today knows of each other.
They both determined the exact 99.7 burn rate for H4831 in a 19" barrel.

I initually dropped from the 338 X 378 and Improved back down to the Edge because I was not happy with my velocities for the amount of powder I was burning in the shorter barrels. Because of the huge case capacity of the Weatherby I could not use faster burning powders and fill the case to where I did not have such huge velocity differences and pressure issues.

To date the 338 Win Mag and the 338 WSM are in another class something below the big boys. Definitely the larger cases are needed to push the 300SMK at appreciable velocities. They lose ground badly with 250gr bullets.
However the next two weeks I am going to challenge the big boys with a 338 Win Mag and see just how close I can get with a new process.

Neal
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  #6  
Old 03-24-2010, 10:49 PM
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Re: 338 comparisons

add the 338 Big Baer to your mix.

Caution on supposed velocities though. Guns with 10 grains less than the smith listed max have been known to lock the bolts up and at 200 fps less than quoted MV. Bet you do not hear that quoted by the smith.

Each gun is a beast unto its own so that does not mean yours will get that and you can always run MV way up with limited brass life and less than max accuracy. So that gives you a high speed miss!

Very few guns ever get max accuracy at the extreme MV ever quoted.

Take for example the 338 Edge. From what I have seen, it gives decent brass life with phenomonal accuracy at the norm of 2820 fps. Not the fastest, but damn sure one of the most accurate and consistent. So how does that play in to max MV equation?

Anyway my 2 centsZ.

BH
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  #7  
Old 03-25-2010, 12:15 AM
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Re: 338 comparisons

Another difficulty is different length barrels.
Add to that some barrels are faster/slower than others.
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