Just loosen the two clamp screws and do what you need to do. Watch the video below to see Robert shoot the gun. To prepare the brass, all you need is a .223 Rem bushing die with .233" and .225" bushings, plus a 20 Cal decapping rod assembly, Redding part #14206, priced about $15. The 3"-wide front "sled" attaches to the threaded anchor for the sling swivel stud, while the rear bag-rider mounts in place of the standard metal rear sling loop. First remove the .223 Rem decapping assembly and replace it with the 20 Cal decapping rod assembly (the same assembly used with Redding .204 Ruger dies). Robert reports that the accuracy of the first 20 Practical AR15 was no fluke. To my surprise I could feel the patch hit a tight spot in the bore right where the set screw for the gas block was placed. No mechanical mods are required to your AR, other than a barrel change. However, for our intended purpose, namely shooting prairie dogs and other small varmints, the 20 Practical chambering offers a significant advantage. Rigid is the way to go if you want accuracy in an AR. Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. I did not test a wide variety of other loads because the rifle was to be sold so we wanted to keep the round count down. The 20-Cal Blitz-King's BC is 46% better than the equivalent .224 bullet. that was too hot for me ,,I went with 23.5 grs of aa2015 , if gives about 3800-3900 in CBI barrel 1-12 twist. We review 20 Practical ballistics in a sidebar below. Because of the promising results on the 700 action, I am currently building an AR-15 upper in 20 practical and can't wait to shoot that. EGW produced a great system consisting of front and rear Delrin blocks. Accuracy came easy with the 20 Practical. I won't comment on the 223ai because I don't know enough about that round. Design and Gunsmithing of the Upper Receiver by Robert Whitley Robert reports: "This rifle is a real shooter, as the video demonstrates. Some time ago, I attached a slip-on gas block with a set screw on a rifle. … The load was with 26.0 grains of H335, CCI BR-4 Primers, Winchester brass, and the Berger 40-grainers going right around 3750 fps.". That’s three shots in 0.375″ edge-to-edge, at 100 yards. www.PDHcenter.com PDH Course M196 www.PDHonline.org Page 1 of 79 HVAC Made Easy: A Guide to Heating & Cooling Load … But we wanted the bag-riding components to be removable so the gun could be easily returned to standard configuration for shooting with sling or bipod. AccurateShooter.com forum member ‘Dennis in VA’ recently put together his own 20 Practical AR with all-premium components. (The 20 Practical cartridge is simply the .223 Rem necked down to 20 caliber — you can use standard .223 brass and load with standard.223 Rem dies. Machined from billet by American Precision Arms, it is fitted with with a RRA LPK and a Geissele trigger. If you move your head far enough back to get correct eye relief, it's nearly impossible to shoulder the gun properly, particularly in the prone position. Just swap in a smaller expander and use smaller neck bushings.) That's superb accuracy for any varmint rifle, much less a semi-automatic. You can start with .223 Rem brass, and use .223 Rem dies with minor modifications. The upper also features a clamp-on gas block, custom-made to our specifications. To learn more about the 20 Practical cartridge for AR rifles, visit Robert Whitley’s 20 Practical Webpage. For example, the BC of the .204-diameter 40gr Sierra Blitz-King is 0.287, while the BC of the .224-diameter 40gr Sierra Blitz-King is 0.196. To allow proper eye relief AND a comfortable shooting position we needed to move the scope well forward, with the turrets slightly ahead of the front of the receiver. You can seat bullets using a regular Redding .223 Rem competition seating die with no mods. *Hodgdon's Reloading Data Center lists 3601 fps as the velocity for a "Max Load" of H4198 and Nosler 40gr bullet in the .223 Remington. Our 20 Practical AR is an extremely low-recoiling varminter. Of course, if you speed up the .224 40gr bullet, some of that gap is made up, but we've used typical max velocities* for these cartridges. There is nothing wrong with the .223 Rem. To make that longer neck a costly die set and a step or two more is needed to form the brass, and move the … Give us a call: (503) 410-5583 | sales@columbiariverarms. It features a heavy billet upper receiver (with side charging handle), fitted with a 24″ PacNor SS Super Match 11-twist barrel. This is simply the .223 Remington necked down to .204. The lower is equally exotic. Oct 16, 2012 #1 R. robbobsam Well-Known Member. Great caliber. The “20 Practical” is a great little cartridge created by simply necking down the .223 Remington to 20 caliber. Dennis took his impressive new gun to the range yesterday, and it looks to be a tack-driver. The rigidity of the receiver and hand guard also help. Robert Whitley (AR-X Enterprises, LLC.) No mechanical mods are required to your AR, other than a barrel change. Without any special load development, the gun has proved very accurate, putting 5 rapid-fire shots in a dime-sized group at 100 yards. I did virtually no load development, yet the rifle produced 'instant accuracy' with H335 and Berger 40gr BTHP bullets loaded about .010" off the lands (about 2.228" OAL). In the accompanying video, Robert Whitley shows how to neck down .223 Rem brass using two bushings in sequence. Y. Yondering OP. Riding on top is a Nightforce 5.5-22X50 NP-R1 scope in Nightforce ultra-light rings. The first propellant I chose to load is Ramshot TAC. The tan, adjustable stock is a Magpul PRS model (Gen II). As with all uppers we build, the receiver face was specially trued and the barrel extension was bonded into the upper receiver with Loctite (in addition to being held in place by the barrel nut). In the beginning when we first started building uppers, we experimented with hand guards made from some composites and other materials. I shoot them from my .204 with a 1:9 Shilen, but what it leaves me with is an auto-ejecting, manual loading, single shot rifle. Of course we wanted something innovative, but the key reason is that the 20 Practical offers better ballistics than the .223 Rem with light bullets, and the 20 Practical shares few, if any, of the drawbacks of a typical "wildcat" cartridge. The 20 Practical is accurate, flat-shooting, and has almost no recoil. Using a Hornady Lock-N-Load OAL tool, Robert measured the distance to the lands for Berger 40gr BTHP bullets. Questions? Shooting from a Caldwell Fire Control Rest supplied by Battenfeld Technologies, the accuracy was remarkable, even in rapid-fire. Magnus Bullhead Broadhead Product Review – The Perfect Turkey Broadhead. Using 25.3 grs I’ll check that I necked the brass correctly and fire formed. From the chart above, starting with a 200-yard zero, a 20-Cal 40-grainer launched at 3850 fps will drop 7.82" at 350 yards, while a .224-Cal 40-grainer (launched at 3600 fps) will drop 11.55" at 350 yards. The 20 Practical AR Cartridge is a .223 Rem necked down to 20 cal. That’s three shots in 0.375″ edge-to-edge, at 100 yards. Quarter-MOA from an AR? Plus the 20 Practical, by all indications, appears to be an inherently accurate cartridge that “wants to shoot”. When Robert really concentrated, on his last 5-shot string (photo right), he posted a .257" group. Your cases through for a load in my AR-15 LC brass Remington 7 1/2 br Hornady. 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