![]() ![]() Pressure is measured at the case mouth or from inside the case according to the CIP.ĭO NOT ATTEMPT ANY EXTRAPOLATIONS. These test methods have been deemed to be safe throughout the world. The listed maximum loads have been determined according to the respective CIP/SAAMI maximum pressure specification, whichever is lower. The data given here were obtained in laboratory conditions following strictly the CIP (Commission International Permanente) Jand Novemrules. We wish you successful reloading with Vihtavuori premium rifle powders! DisclaimerĪll of this reloading information has been provided by Nammo Lapua Oy and Nammo Vihtavuori Oy. Please note that due to safety regulations, we can’t suggest or recommend loads or bullets that are not available on this site. ![]() The listed maximum loads should never be exceeded. All the rifle loads on these pages are pressure tested according to the C.I.P. charge weight in grams and grains as well as muzzle velocity in meters and feet per second. For flexible usage, we provide our reloading data in metric and imperial dimension systems, i.e. On the list below, you can find all the rifle reloading data we have currently available. ![]() Good luck if you test this load data and let me know how it works for you.Rifle reloading – handloading data for rifle calibers The Alliant powder seemed a little quieter than the IMR powder. There is still a lot of gas coming out of the ejection port. These loads were not particularly quiet suppressed. I needed to load these rounds with a COL of 2.260”. Also, before you test any load shoot it on paper to make sure your rounds are not keyholding without a suppressor. You need the extra pressure the suppressor provides. Note, you must use a suppressor to get the bolt lock open. I suspect this load will produce somewhere around a 1.5 – 2 MOA grouping. I did a quick 4-shot test to take a look at the accuracy. Here’s the grouping of the IMR load from 25 yards. Note, you will probably have to tweak the load data to your specific firearm. This is the AR I used with a Mystic X suppressor. The standard Gas Hole Diameter of 0.070” works fine. You will need a 1:7 twist barrel at least 16” long with a carbine gas port. I was able to get both Alliant 2000-MR and IMR 4227 working. Outlaw State Bullets recommended a load using IMR 4227 for a cycling AR subsonic round. They make a hollow point bullet that will expand at low velocities. That was the only place I found that manufactured anything over 100 grains. 224 bullets from Outlaw State Bullets LLC. The powder in the Atomic load looked very similar to Alliant 2000-MR, so that’s where I started. The bullet is 112 grains and the primer looked like a Winchester small rifle primer. I took apart the cartridge and what I found was they are using 15.6 grains of a fine flattened ball powder. Obviously you need a heavy bullet for cycling an AR 223. The clue the Atomic ammo gave me was they figured out how to get enough pressure at low velocities to cycle the bolt. The Atomic sub ammo gave me around 1150 FPS from the 10.5” barrel and around 1500 FPS from the 16” barrel. The ammo cycled and locked the bolt open in both the 10.5” and 16” barrels. I could not get the Atomic subs to stabilize with my fast twist 1:7 10.5” or 16” 5.56 NATO barrels. I had high hopes for the sub ammo, but it didn’t work. I ended up purchasing some Atomic Tactical Cycling 5.56 NATO Subsonic Ammunition from Midway at $60 for a box of 50. Some of the load data posted that claimed to cycle an unmodified AR did not work for me. It seems a few others have tried this and ended up not having much luck either. I tried to find some load data but had no luck. 223 subsonic load working with a standard AR15 platform that cycles. For the past 7 months I have been trying to get a. ![]()
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