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Those websites are very reckless with their load data as far as I can tell. My 6mm AR can't even get close to the velocitys that they claim without running into very flat primers and ejector marks!
I have lot's of hand written data that would be tedious to post....You can use the loads that you've found online......just back them off a few grains! That's exactly what I did and the outcome was as expected.....Superb accuracy from an AR platform!Last edited by Zeus; 03-21-2020, 11:46 PM. -
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L97, there is data at the Hogdon web site for 107's in the 6PPC. The velocity data from your other thread matches pretty well. As it lists chamber pressure it should be of help getting started.Comment
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That's probably because when the 6 PPC was a popular bench rest cartridge, the only bullets used were light ones. Barrels and chambers were cut and twisted for the lighter bullets.
May not produce real high velocities with the 107 but if you have a chamber cut for them and the barrel twisted fast enough, they will shoot and probably shoot real well. Just not real fast.
I would think with this cartridge that if you used 6 AR loads you would be fine.
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I too concur with the load data on the 6mmAR website is way too hot for my taste. I start with some 6 PPC max and work up from there. My bullet choice is 95 SMKComment
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One of the issues with the 6mmAR website is at the time Lapua made Alexander Arms brass, now Hornady does, and there is a 0.5+ grains of water difference. Loads that might be okay in Lapua are hot in the smaller capacity Hornady. And Federal is even smaller capacity than Hornady.Comment
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I am having good success with RL-17 in longer barrels. It tends to give a later, lower peak pressure while producing higher velocities. 1/2 MOA is attainable with the 108 grain ELD loaded 0.020" off the lands while running 2600+ fps out of a 22" barrel. I am comfortable using 28.0 grains as a starting point in that a compressed load does not show signs of pressure in my rifles. I will be trying magazine length loads in the next few weeks.Comment
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Bolt gun is substantially more & each gun may require a bit of adjustment. Reason they say start low & work up.
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Yea case dimensions & throat are slightly different from the 6 ARC to the 6 GrendelComment
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Barrel length & powder charge vary quite substantially in this Hornady data from the gas gun vs the bolt gun. Thus max velocity varys substantially.Comment
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Hodgdon Has load data out now for 6ARC 24" barrel velocity's
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