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Good advice - IIRC, the US Army has taken this route due to bolt fractures after 3,000 to 10,000 rounds. Why? Cyclic motion + corrosion pits = fatigue tester. See https://www.sciencedirect.com/science/article/pii/S1350630705000221 for a report on this. Note the failure pattern of the bolt is...

Found this while looking up construction of the barrel: http://www.designfax.net/news/archive/10-21-2008/stories/feature-2.asp . Talks some about the manufacturing, and the proof firing (from sample barrels of that production lot, fire a 10 round burst - typical accuracy of 4" at 100 feet)...

Wonderful stuff, MEK. So wonderful, my employer (aerospace manufacturer) refuses to allow mechanics to use it. Apparently, long term effects of breathing MEK fumes include nerve damage. Wear appropriate safety gloves and an appropriate respirator when using the stuff. MSDS for MEK...

Mort, The feed system not only loads live rounds, it also collects spent cases. At 3000 rounds/minute, it's a tall order. Zippy, 1,550 rounds, according to https://en.wikipedia.org/wiki/Phalanx_CIWS#Gun_and_ammunition_handling_system . Even with that many rounds, you are correct that the...

52C has a magazine. Best guess is a 52B or early C.stock.

Mike (and all). "OBA" stands for "Oxygen Breathing Apparatus". In design and function, it is a "rebreather" system, where CO2 is chemically converted to O2. THE OBA unit is (or was) a US Navy system for supplying breathing air to damage control crews aboard ship. Scott Air packs and...

Why do you think the often quoted statistic for snipers is 1 kill per 1.7 shots? :confused: Again, this takes nothing away from the shooter, but it does stress just how difficult connecting with such a shot is.

That line is probably where the 6mm neck ended. Is it a thicker section of brass, or thinner? If thicker, use of a neck reamer will probably remove it. Agree that annealing before necking up is probably a better answer though.

Re: Blackout ammo. Multiple manufacturers load ammo for this caliber. Remington's "low end" 120 grainer actually performs fairly well, though I suggest you stay (far, far, far) away from most 147 or 150 grain full metal jacket loads. (Really, really low end bullets, resulting in less than...

Josh, Most 80 grain .224" bullets are not meant to be magazine loaded, but as single shot rounds only. Have seen 80 loaded for standard magazine length (2.260"), and they're interesting - the ogive to body join is inside the neck, making the cartridge appear as if it has an air intake...

All, For a history on SBRs, machine guns, and suppressors, see the article at https://en.wikipedia.org/wiki/National_Firearms_Act . No, NFA 34 was NOT an attempt to keep civil servants in office.

1. Peaked roofs trap sound. Consider using a roof with a single slope, with the high side facing the range. 2. Put a sound absorber under the ceiling to muffle the boom of firearms. 3. Put a sound absorber (rounded gravel works nicely) ahead of the firing line. 4. It should be a rule...

Since nobody has asked, why is .30 caliber scoring being used? US F-Class uses the "Bullet" Diameter" rule, where the diameter of the bullet (and not a .30 cal plug) determines score. This is probably why finding scoring plugs with a .30 caliber ring is difficult. Have heard no complaints...

Pete, You asked for solvents, but the best method I've seen for cleaning metal fouling from barrels is electrochemical. While Outers discontinued their Foul-Out units (units are still for sale), searches online ("Electrochemical barrel cleaner" or "electronic bore cleaner" are good starting...

Comparing the readings against other chronos is a sound method of checking the calibration of the electronics of the various units. However, having a good reference firearm/ammo system is still important. Having said this, guns firing projectiles at the most uniform velocities are not...

Standard twist rate for a 40XC is 1:12". Such barrels will shoot 190 Sierras reasonably well, friends used to use modified Remington Varmint Synthetics (same twist in factory barrels) with 'em to shoot Palma. Have shot 185 Berger VLDs from a VS barrel at 1000 yards, no complaints about...

As noted previously, Dillons are not commonly used for loading benchrest ammo. David Tubb (no "s") uses one for loading good quality ammo for highpower. The US Palma Team has used 550s and 650s for loading practice ammo. Other members of the LR community use progressives for loading their...

The Fifty Caliber Shooter's Association (http://fcsa.org) maintains records for groups fired with .50 BMG rifles. The record in the 1000 yards semiauto category is (IIRC) 12 inches for 5 shots, think the rifle was a Barrett M82. Understand both rifle and ammo were heavily modified to obtain...

If you shoot indoors - make sure you have a really good backstop. Apparently, the late Skip Talbot ran some tests with "pseudo houses". (Wooden structures with the equivalent of a house's worth of material for the bullet to pass through.) Bullets (non AP?) went through six of them in a row...

No on experience, but from http://www.snipercentral.com/fnh-special-police-rifle-spr-a3g-precision-bolt-rifle/ : "FN is a part of a larger conglomerate known as FN Herstal (FNH) which actually owns FN, Browning and Winchester firearms, the latter being purchased after Winchester went bankrupt...