sutherpride59
06-17-2018, 12:15 AM
So the data first, I have an AR in 300 AAC with 16” barrel. Using Lake city converted brass H110 powder, Winchester small rifle primers, trimmed to 1.360” with a Lee 312-155-2r projectile has checked and lubed with Felix lube at 22bhn using 17lbs pure lead, 2lbs super hard and .8ounces pewter...oops on that more than I meant to lol.
So I was working up a load in .5grn increments, I started with 14 grns and worked my way all the way up to 17grains. By 16.5 I noticed light cratering and a slight impression on the brass from the ejector. So I fired one 17 gen and I noticed slight cratering, flattened primer but slight impression from the ejector. Here’s the problem, 16 grns is the last load that didn’t show high pressure signs but my groups didn’t show any improvement till I hit 17 grns. That load shot a .78” group at 50 yards. The rest were at 1.78” at 50 was the secon best at 14grns, probably a fluke. These were all 5 round groups.
My question is with 300AAC being such a low pressure round yet creating these high pressure signs should I lower the load to 16grns and just cast like 18bhn rounds. Also at 16 grns I was averaging 2013fps, at 17grns I was averaging 2104fps.
I based my data off of hogdons website for jacketed data.
So I was working up a load in .5grn increments, I started with 14 grns and worked my way all the way up to 17grains. By 16.5 I noticed light cratering and a slight impression on the brass from the ejector. So I fired one 17 gen and I noticed slight cratering, flattened primer but slight impression from the ejector. Here’s the problem, 16 grns is the last load that didn’t show high pressure signs but my groups didn’t show any improvement till I hit 17 grns. That load shot a .78” group at 50 yards. The rest were at 1.78” at 50 was the secon best at 14grns, probably a fluke. These were all 5 round groups.
My question is with 300AAC being such a low pressure round yet creating these high pressure signs should I lower the load to 16grns and just cast like 18bhn rounds. Also at 16 grns I was averaging 2013fps, at 17grns I was averaging 2104fps.
I based my data off of hogdons website for jacketed data.