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#1
06-13-2017, 11:13 PM
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6mm wildcat
I am starting to work with a 6mm wildcat based on .243 Lapua brass. It has a longer neck, sharper shoulder and less body taper. The designer calls it the 6SBR (Super BR) and he felt like it's capacity was reduced from the .243, but he never actually tested it. I measured capacity of water between the wildcat and a regular .243 case and found that it was only 2.5% less capacity, which surprised me as the shoulder is pushed back quite a bit. With that little capacity difference, would it be safe to assume that .243 load data would be relevant to the 6SBR? Thanks.
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#2
06-17-2017, 12:25 AM
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Another idea for your 6mm Wildcat idea.
I have been shooting the 6.5 Grendel for several years now and enjoy the caliber in both an AR15 and bolt gun configuration. I found an article on the 6mmAR and found it to be a 6.5 Grendel necked down to a 6mm (.243). Columbia River Arms makes a .243lbc, which is the same as the 6mmAR. They built a barrel for me that goes in an AR15 and shoots extremely accurately. CRA is the parent company of Black Hole Weaponry and they have their own website and you can get a ton of great information on the .243lbc. It uses less powder, has great ballistics, less recoil and the brass is easy to make using the parent brass, 6.5 G or from the 7.62X39mm AK and SKS ammo. Amazing accuracy out to 600 yards and at shorter ranges 100-300 yards it will hold it's own with the 6mmPPC. They make barrels for both the AR15 and bolt guns.
An article on the cartridge: bhttp://www.msrhunt.com/post/6mm-ar-6mm-grendel-243lbc-7114424allistics Another article: http://www.ar15.com/forums/t_3_121/5..._6mmAR___.html Website: http://6mmar.com/ Food for thought, good luck with your build.
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#3
06-17-2017, 07:36 PM
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I would think a starting.243 load would be a safe place to start. Possibly.5 grain less and work up.
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#4
06-17-2017, 10:52 PM
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Quote:
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