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    Space Camo for a Space Gun

    Black 3.0
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    Barrels with choke to increase barrel life and reduced need to clean in long shooting sessions

    Barrel chokes in rifles are an oddity and in some instances are not well understood. They originate with particular calibers of machine gun and seem to benefit most when barrel life is considered when firing AP type ammunition, or exceptionally heavy jacketed projectiles. The accuracy of such...
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    Monolithic solid projectiles in polygonal rifling

    How accurately does the major bore diameter have to match up with the projectile diameter to realize decent accuracy. We are stuck with a predetermined projectile whose tolerances are awful. Any opinion as to is polygonal is more or less forgiving Other reason to ask is that the basis of the...
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    Monolithic solid projectiles in polygonal rifling

    Every now and again work has me delve into a subject where the data is limited. In this instance to look at barrel life and the influence of rifling form when firing what is essentially a solid projectile. As expected muzzle velocities are required to be quite high and the working pressures are...
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    New 6mm Advanced Rifle Cartridge

    Grendel case web was designed to operate at 58,000 psi with worst case internal dimensions and minimum spec case head brass hardness. Feed cone on the rear of the barrel was changed to support the web correctly. Larger chamber mouth diameter and increased distance from cartridge center to OD...
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    Sidearms & Scatterguns Sig P365 owners?

    6000 rounds through a company gun with only a couple of failures to feed. Trigger gets better after 200 rounds and accuracy tightens up as well. Gun does not like 10 in the mag plus one in the breach. Magazine sits perfectly with 9 though.
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    Nemo Arms M210

    Variable ammunition heating from the fired gun has to be accounted for in the move from a bolt gun to a semi and especially as the cartridges grow in size. With a bolt or manual bolt drop the user can chamber the round and maintain a known dwell time. To compensate with a semi, that immediately...
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    Accuracy and Upper Receivers.

    The receiver can be regarded as an open bottom U section with a slot in the side and an end plate on the end the barrel cantilevers on. Think of this like a piece of plastic guttering and you get an idea how it deforms. Barrel and hand guard are attached at the same point on the end wall...
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    Gunsmithing Bee Hive Footin. . .

    Structurally the outer surface contributes most to the stiffness and is where the maximum strain occurs during bending or torsion of a bar/barrel. The inner axis or center does little during loading. Pocket type features will remove more material from closer to the central axis. Thus this method...
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    6.5 Grendel more or less dead?

    Barhaul cartridge who produces the steel case ammunition for Wolf has recently changed the gauge rings for the projectile production to increase the projectile diameter. Previously they had manufactured it per Russian military so excessive production die wear and variations in a fleet of barrels...
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    5.8x42mm Chinese

    Design was focused on penetrating armour from the outset. Little consideration of the wound channel but yaws as expected with no fragmentation or deformation. Still quite nasty. Initially offered as light and heavy loadings, replaced by an intermediate weight load said to improve the ability to...
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    Gunsmithing Ion Bond / DLC coatings and tolerances.

    DLC is a generic term and as with many things the devil is in the details. The coating is applied by PVD (physical vapor deposition) but the way the plasma is generated and how it is moved to the substrate will influence the performance of the applied film. Cathodic arc generally creates a dull...
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    Looking for a tripod setup with multiple uses.

    The Feisol leveling head is well made but certainly lacks the fine adjustment needed to apply varying levels of tension. My fix was to stack 3 wave washers between the threaded handle and locking plate above it. Was surprised how much tension is actually needed and belville washers may yet be...
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    Gunsmithing .338 Muzzle Brakes

    This might sound counter intuitive but my limited experience has shown that it is possible to over brake the 338 Lapua. Producing and testing these rifles leaves me with a certain amount of time to play and experiment with different stuff, from bipods and scopes to slings and muzzle brakes. My...
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