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Ten 3-shot groups with each load tested at 300 yards: A. Smallest is 3 inches, average is 5 inches, largest is 7 inches. B. Smallest is 1 inch, average is 5 inches, largest is 9 inches.

Rest a rifle whose sight is zeroed for its ammo at 100 yards on bags. Position the rifle so its sight is centered on target 100 yards away. Don't touch or hold the rifle. Somehow, remotely fire the rifle without disturbing its point of aim. Where does it shoot bullets relative to point of aim?

Interesting information: https://www.shootingsoftware.com/ftp/psicuparticle2.pdf

This is often mentioned and the popular reason seems to be we all "look through" or "see" the sight(s) differently. Fact? Fiction?

Their ball powders are used in lots of commercial ammo as well as the Lake City Army Ammo Plant. This page has a pdf file to download listing powder numbers, burn rate speeds and military ammo it's used in: http://www.gd-ots.com/ballpowder_military.html Picture herein shows commercial ammo...

Came across this site then decided to check it out. Did this one first: http://www.redding-reloading.com/tech-line-a-tips-faqs/145-dealing-with-headspace Almost barfed when I read: That's "head clearance." If it's zero or less and binds, bolt heads don't twist back into battery the same for...

Interesting data on 22 to 50 caliber stuff. Most accuracy specs are stated in inches that is the mean radius of many shots from test group center; extreme spread will be 4 to 5 times mean radius. 7.62 M118 LR accuracy spec is maximum spread vertical and horizontal...

Do any competition or match grade rifle bullet seating dies have case mouth crimping features? If so, which ones?

That's the force that's needed to push a bullet out of a case mouth. It's caused by how tight the case neck grips the bullet along with the friction coefficient between casse neck and bullet that's caused by the force they're against each other, the area that force is applied and the lubricity...

Ten 5-shot groups fired with each: A. 2" to 4" group sizes. B. 1" to 5" group sizes. Both 50-shot composites' mean radius' are the same.

What about a match that's scored by miss distance from target center? Target would be a black round bullseye 5 MOA at all sorts of ranges. No scoring rings. Both rifle and pistol. All sorts of shooting positions. Artificial (bench, bag, pod) support and/or slings may or may not allowed...

Mounting scopes for left handed rifles and shooters. See post #23 and #24 in: https://www.thehighroad.org/index.php?threads/left-hand-rifle-right-handed.814509/#post-10427094

A few days ago calculating two Weaver Model T target scope's objective lens focal length, I had zeroed those windage (W) and elevation (E) adjustments to mechanical centering of the inner tube in the main outside tube so it's on the optical as well as mechanical center of the scopes. Then I...

Searched for Hatcher's Notebook hoping to find a site that had a free one to download. Found it in https://murdercube.com/files/Firearms/ and listed these books listed by title: Firearm Manuals/ Law (re Firearms)/ Machine Guns/ Marksmanship and Sniping/ 9mm Pistol - B-GL-385-003-PT-001.pdf A...

Took my two Weaver Model T’s to lay in mounts with loosened top clamps, then spun them until reticule’s stayed at the same place on target at short range; that’s mechanical and optical zero (M/O zero) for the scope as the erector tube’s optics are centered in the scope tube. Both started out...

Used Sierra Bullets data for two cartridges to calculate how much average muzzle velocity would change for a 1/10th grain change in powder charge weights. A mid-range velocity's powder is listed in order of high to low for fps changes; those either side will be close, but there are some...

http://www.foxnews.com/tech/2015/12/07/american-sniper-widow-taya-kyle-outshoots-nra-champion.html Three cheers for Taya who used: http://www.foxnews.com/tech/2015/11/10/taking-fight-to-isis-heres-free-rifle.html

Where does the rifle barrel point when the firing pin slams into the primer before it burns the powder and bullet starts to move out of the case mouth? A. Above the aiming point equal to bullet drop at target range. B. Above the aiming point equal to bullet drop at target range plus sight...

Where does the rifle barrel point when it’s zeroed for some ammo at 200 yards at the time the bullet exits the barrel? A. Above the aiming point equal to bullet drop at target range. B. Above the aiming point equal to bullet drop at target range plus sight height above bore axis. C. Above the...