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July 2nd, 2015

Use Stub Gauge to Check Shoulder ‘Bump’ and Seating Depth

AccurateShooter stub gauge barrel chamber headspace reloading

Forum member Rich DeSimone uses a handy “Stub Gauge” for setting shoulder “bump” and seating depth. The gauge is made from a section of barrel lopped off when the muzzle is crowned. The chambering reamer is run in about 1/4 of the way, enough to capture the neck and shoulder area of the case. Rich then uses his full-length die to “bump” a master case with the ideal amount of headspace for easy feeding and extraction. He takes that case and sets it in this Stub Gauge, and measures from the front of the gauge to the rim. He can then quickly compare any fired case to a his “master” case with optimal headspace. Since the gauge measures off the shoulder datum, this tells him how much to bump his fired brass.

In addition, the Stub Gauge can be used to set bullet seating-depth. Rich has a channel cut transversely on one side of the gauge, exposing the throat area. Since the interior of the gauge is identical to the chamber in his gun, this lets him see where a seated bullet engages the rifling. He can tinker with bullet seating length until he gets just the right amount of land contact on the bullet, confirmed visually. Then he measures the case OAL and sets his seating dies accordingly. This is much handier than using a Stoney Point Tool to measure distance to the lands. As your barrel’s throat wears, you may seat your bullets out further to “chase the lands”, but the gauge provides a constant land engagement point, in the barrel’s “as new” condition. By measuring the difference between the land contact point on the gauge and the actual contact point on your barrel, you can determine throat “migration”.

Permalink Reloading, Tech Tip 1 Comment »
July 1st, 2015

Nearly a Third of Americans Own Guns

Gun Ownership Study 2015 Columbia Injury Prevention

As an American firearms owner, you’re in good company. A new Columbia University Study indicates that nearly 30% of American adults own at least one gun. As you might expect, state gun ownership rates varied greatly. States with low population density showed a higher percentage of gun owners. The Top Five gun-owning states were: Alaska (61.9%), Arkansas (57.9%), Idaho (56.9%), West Virginia (54.2%), and Wyoming (53.8%). As you’d expect Montana (52.3%) and New Mexico (49.9%) were in the Top Ten, but to our surprise Texas, at 35.5%, was not. Must be those Yuppies in Austin …

Two East Coast micro-states were at the bottom of the scale, with gun ownership rates under 6%. Delaware, at 5.2%, had the lowest percentage of gun owners, followed by Rhode Island (5.8%).

The gun ownership study, published on the Injury Prevention website, showed that 29.1% of Americans over age 18 own firearms. Results were based on a web survey of a representative sample of 4000 persons from all 50 states and the District of Columbia. CLICK HERE to Read Full Study.

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Permalink News 20 Comments »
July 1st, 2015

AR Brass Catcher — Great Accessory for Under Ten Bucks

Caldwell ar16 ar-15 ar brass casing bag net catcher

If you shoot an AR-platform rifle, you could probably use one of these gadgets. A brass-catcher keeps your brass in good shape and saves you the hassle of picking up fired cases. Moreover, nearby shooters no longer have to fear being pelted with your hot brass.

Caldwell ar16 ar-15 ar brass casing bag net catcher

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Permalink Gear Review, Hot Deals 2 Comments »
July 1st, 2015

The 6mm Super LR — .243 Winchester Made Better

6mm Super LR Gun

In our Forum recently, there was a discussion about “improved” cartridges based on the .243 Winchester parent case. One popular such cartridge is the Super LR, a 30° long-necked wildcat. The 6mm Super LR was developed by Robert Whitley, who wanted something similar to the 6XC, but with “more boiler room” to push the 115-grain bullets comfortably at 2950-3050 fps.

To illustrate the Super LR for interested readers, we dug into our archives and found a report on a 6mm Super LR varmint rifle belonging to Barry O. (aka “TheBlueEyedBear”), a long-time AccurateShooter Forum member. A few years back, Barry put together an impressive 6mm Super LR long-range varminter on a BAT SV action. Barry actually sourced many of the components for this rifle through our AccurateShooter Forum Free Classifieds. CLICK HERE to read all about Barry’s Super LR BAT-Actioned varmint rifle, featured in our popular Gun of the Week Series.

CLICK Photo to Read Full Story
BlueEyedBear Gun

The Richard Franklin walnut LowRider stock (above) for Barry’s rifle came from fellow Forum member “Preacher”, who also did most of the metal work. The gun is chambered as a 6mm Super LR.

6mm Super LR .243 Varminter

Super LR Whitley BlueEyedBear

6mm Super LR Cartridge Design and Loading Advice
by Robert Whitley, AR-X Enterprises
Conceptually, the 6mm Super LR is like a long-bodied 6XC (case body about .120″ longer). The Super LR has a long neck (.321″ vs. the .263″ long neck of the parent .243 Winchester case). The Super LR also has a 30° shoulder angle vs. the 20° shoulder angle of the .243 Winchester parent case. The Super LR has about 54 grains of H20 capacity, compared to 55 grains for the .243 Win and 49 grains H20 for the 6XC.

The Super LR has sufficient case capacity to shoot the 115gr 6mm bullets in the 2950 – 3000 fps range without being “on the edge” of maximum pressure. If you do not need to run sustained fire in long strings, you can “hot rod” things more. Testing has shown that the Super LR can run the 115s up around 3100 fps without issues. With the 105-108 grain 6mm bullets, the 6mm Super LR can push them up in the 3150-3200 fps range with the right powders. In addition, if you like to shoot the 105-108 grain bullets close to the lands, or engaging the lands, the Super LR cartridge case neck is long enough to give most of them a good bearing surface purchase, even if the chamber is throated for the 115gr bullets. That gives the 6mm Super LR cartridge great versatility.

The 30° shoulder angle of the 6mm Super LR is another good feature of the Super LR. Not only does it help to avoid the throat-torching effect that people associate with the .243 Winchester (because of the .243’s short neck and 20° shoulder angle), but the 30° shoulder angle has also been a hallmark of some very accurate cartridges such as the 6 PPC, 6mm BR, 6XC, and 6.5 x 47, to name a few.

6mm Super LR Whitley

The 6mm Super LR wildcat is easy to make. Robert Whitley figured out how to reform domestic .243 Win brass with one simple pass through a Redding 6mm Super LR full-length sizing die. Robert has commissioned these dies from Redding. Call Robert at (215) 348-8789 to order.Learn more about the 6mm Super LR on Whitley’s www.6mmAR.com website.

Permalink Bullets, Brass, Ammo, Gunsmithing 10 Comments »