There was a dip in interest for a while, but lately I see a renewal in manufactures offering finished guns and barrels for custom builds. 6.8 SPC – Another case with a long and windy road.While still experimenting with this round, I have not been able to reach the advertised performance. A whole host of issues have slowed the adoption of this cartridge by rifle manufactures. This cartridge again requires a special bolt and magazine. Based on the 220 Russian case that has been used for many other wildcat rounds through the years. 6.5 Gendel (I will include in this the variations to avoid the Alexander Arms copyright – 6.5 LBC, 6.5 CSS, etc).Negatives include: switching to a 6.8 bolt and magazines, can only handle up to 87gr bullets at magazine length, cases cannot be formed from any readily available case. The advantage of this design is the added case volume vs the 6×45. See Creedmoor Sports for more information. 6 mm Hagar – A recent design to meet the needs of cross the course shooters.In recent times, this case has been overshadowed as bullet manufacturers developed 69gr and even 77gr bullets that could be loaded magazine length in the 223. So the 6mm offered a selection of heavier bullets, delivering better ballistic performance. At the time the 223 was still using the slower twist with 55gr bullets. It is simply the 223 Remington case necked up to accept a 243/6mm bullet. 6×45 (6mm/223) – This was the first wildcat I remember people adapting to the AR 15 platform.For the casual user, make sure what you gun is chambered to handle: 223 rem,223 wilde, or 5.56 Each has an advantage depending on your use. Loaded ammunition is widely available, again with a mind numbing array of choices. The choice of barrels/contours/twists should meet any need. With all the work done by the manufactures, hard to beat for the casual shooter. 204 Ruger – Bullets are too small for me to pick up! I don’t see the advantage of this caliber over a regular 223 loaded with lighter bullets? Just not enough interest for me to give it a try.not every caliber that has ever been offered). Here is an overview of the calibers I have either worked with or explored (ie. These options try to address the specific needs of the user to include: 3 gun, varmint hunter, cross the course, tactical, and just the ‘more power’ crowd. The explosion of calibers available for the AR15 platform over the last 15 years has just been amazing.
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