To cause cancer, birth defects or other reproductive harm. So to be safe for the long 300gr bullets you would want a 1in8 twist barrel, no matter which cartridge you choose.WARNING: The products offered for sale on this website can expose you to chemicals which are known to the State of California As you can see, if you have a 1in9 twist 338 barrel shooting subsonics in winter, you might get some unstable bullets (keyholes), with the Lapua Scenar or Berger Hybrid. I did all the above for you, because you want a minimum stability of 1.500. Sierra 338, 300gr Match King = 1.700" stability= 1.554(1in9), =1.967(1in8) Item Name: FT 338 Spectre upper Location: Macon Item is for: Trade Only Trade Value or Items Looking For: Quality AR pistols, handguns etc Caliber: 338 Spectre Willing to Ship: Yes Bill of Sale Required: No Item Description: Considering trading off my new unfired 338 Spectre upper. Using worst case temperature of 0F, 1050 fps. Use the following bullet lengths for the calculator above.
The same high quality you have come to expect from McGowen Precision Barrels. Custom twist rate, length, contour, chambering, threading and finishing all delivered directly to you. The higher you are away from the ocean (sea level), the more bullet stability you get. Replacement Barrel for your Savage, Remington and Remage rifle. Worst case bullet stability is temperature of 0F at sea level, and 100F at sea is much better stability. (free JBM Miller Stability Calculator online) However, that is overkill and a 1 in 8 twist is sufficient for the long 300 grain bullets in 338, at 1050 fps, no matter whether you choose 338 Spectre, 338 Whisper, or 338 Federal. I had the barrel made with a 1 in 7 twist to be safe for the 300 grain bullets.
To get good supersonic performance along with subsonic in 338, then you would want either the 338 Whisper or 338 Federal.Įdited to add on 4/13: I built my 338 Federal subsonic bolt rifle some years ago, when the Miller Stability Calculator was not available widely yet. The question is, do you want to use this solely for subsonic? If so, then the 338 Spectre may be best to use on an AR-15 platform or a bolt rifle. The 338 Federal is made to use with the DPMS 308 or AR-10 platform. 338 seems to have capped out at 300gr or so. Upper PartsCryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Assembly. Lots of development into heavy match bullets in smaller and larger calibers, but. 338 bore, both OTM/HPBT type for accuracy, and expanding bullets (ala selous) for hunting. The 338 Spectre is made to use with the AR-15 platform. For my part, I'm looking forward to potential research into super heavy subsonic pills for the. It also has slightly more H2O capacity for the brass than either 338 Spectre or 338 Whisper.ģ38 Federal, 57.5gr capacity, 2.800" COALģ38 Whisper, 43.0gr capacity, 2.650" COALģ38 Spectre, 28.8gr capacity, 2.310" COAL Making 338 Federal brass is simple too, just run 308 brass through the die and expand it and resize in one step. I could also build a new upper for my DPMS 308B or just get a 338 Federal barrel for it and have a semi-auto subsonic rifle. I have been using the 338 Federal for a number of years as a subsonic platform, using a bolt rifle (1in7 twist barrel).
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