![]() I notice my groups open up with this particular rifle when I get heavier than 55 gn, and it too has a 1/9 twist. Ive got a Savage Axis I have gotten to shoot inch or under consistently at 100 yards with 52 and 53 grain HPFB bullets, and several flavors of 55. To compare apples to pears, as oranges are a bit further out. It's just me but I think your 16" barrel will like the faster powders and middle weight (60 to 63 grain) bullets best. Save the BLC2 and CFE for the 70 grain and bullets. For heavier than 64 grains try AA2520, H4895 and IMR4895. Download a burn rate chart from the internet and for 55 to 63 grain bullets try AA2230 and AA2460. The bottom line is your powder choices are too slow for a 55 grain bullet but could do well with heavier bullets. I have tried other fast burning powders in my Mini 14 and they have all been very accurate but since they are so hot (chamber pressure) you take a big hit on velocity. Of all the powders I mentioned the IMR3031 is the fastest burning powder but among the most accurate I have tried. AA has a great internet reloading guide and on line loads. It burns slightly slower than the AA2230. The 24.8 grains of AA2230 is just right at 55,000 psi. They are just over the 55,000 psi threshold. 223 pressure loads except the 25 grains of AA2230. I will use AA2460 for the 63 grain SMP's.Īll of these loads are. I will probably use AA2520 to launch those. I recently got Sierra's 70 grain SMP's but I have not fired any of them yet. If you are looking for a heavier bullet I also like the Sierra 63 grain SMP. Nosler, Hornady, Speer and one more I don't recall are all on sale at Sportsman's this week. They are on sale at Sportsman's Warehouse for 20% off this week. 55 grain hollow point Nosler Varmageddons are a nicely accurate bullet. As a suggestion if you are using 55 grain bullets I would give the Hornady Vmax's a try and Hornady"s 55 grain soft point with 24.8 to 25 grains of AA2230.Īnother suggestion would be 24.6 of IMR3031 with a 55 grain bullet. But, it depends on what bullets you are using and the load you are shooting. I am surprised you are not getting good groups with AA2230. I am finding that the faster the powder the better the accuracy. 223 chamber and a 1/8 twist and it likes 55 grain bullets very well. I tend to think your's is a 1/8 twist but I'm not sure. If you have at least a 1/9 twist you can move up the bullet weight as well. I don't believe you will get the best accuracy from FMJ's either. I don't believe you are going to get the best accuracy from that chamber. I worked up a load using 60 gr Sierra bullets, Sierra used a 20 inch barrel for their tests, with the same powder charge I am getting 100 fps less with 4 inches less barrel which is about right, I am going to stick with that powder charge and see how accurate they shoot.Click to expand.You have the 5.56 chamber on your rifle. I again chronographed those loads in question, same results, they were within 10 fps of the last time I chronographed them. I checked my chronograph with 222 rimfire loads, also fired a few 223 factory rounds, they registered within 7 fps of when I shot them last. The loads themselves appear to be safe.[/QUOTE If you see 1400 to 1500 fps, that would indicate where your problem lies. I'd be inclined to double check the chronograph, possibly light conditions were allowing a high reading, but try it again after you've shot some 22 LR across the screens and have seen *about* 1200 fps with a standard load. Mid 2800s for velocity, 41.1 Kpsi, so pressure is good, as indicated by ejection pattern, and the load is a compressed one at 111% case fill. Throats on 5.56 chambers are on the long side, helps with pressure. Your stated case length looks wrong, should be around 1.750" ![]() Have you checked the chrony with a 22 LR load, they are very consistent at 1200 or so fps, and if you get a good velocity with that, it will eliminate the chrony as a source of error.
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