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April 19th, 2022

Wind Speed or Wind Direction — What Counts Most?

Wind reading bryan litz speed direction

Wind-Reading Lesson from Bryan Litz

Q: What’s more important — wind speed, or direction?

A: Obviously they both matter, but they do trade dominance based on direction. For example, a 10 mph wind between 2:30 and 3:30 is only changing its value from 9.7 to 10 to 9.7 mph (bracket of 0.3 mph). However a 10 mph wind between 11:30 and 12:30 is changing its cross wind component value from 2.6 mph left to zero to 2.6 mph right (bracket of 5.2 mph). There is the same 30° change in direction, but this results in a massively different bracket.

Point being, in this case, a direction change is far more critical if it’s near 6 or 12 o’clock. A small direction change when it’s close to 3 or 9 o’clock is negligible.

On the contrary, a change in wind SPEED when it’s near 3 or 9 affects your crosswind component directly. But for a near head or tail wind, a fluctuation in wind speed only causes a small fraction of a change to the crosswind component.

SUMMARY: If you’re in a near full-value wind, pay more attention to wind SPEED. If you’re closer to a head- or tail-wind, nailing the exact DIRECTION will be more important.

Get More Tips on Bryan Litz Ballistics Facebook Page
This post is from the new Bryan Litz Ballistics Facebook Page. FB users should check that page regularly for more tips from Bryan, American’s leading ballistics expert and founder of Applied Ballistics LLC.

READ MORE TIPS HERE: www.Facebook.com/BryanLitzBallitics

Bryan Litz coaching Team USA in Canada using a WIND PLOT.

BIG NEWS Coming Soon: Bryan Litz and Applied Ballistics will make a Major Announcement tonight, April 19, 2022. The Announcement will be featured on Facebook and other Social Media, and we’ll have a report in tomorrow’s Daily Bulletin.

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April 19th, 2022

Bullet Stability and Barrel Twist Rates — What You Need to Know

gunwerks bullet stability barrel twist rate video animation

Are you curious about bullet stabilization? Do you understand why bullets can tumble or become unstable if the velocity gets too low or if the twist rate is inadequate. Here is an excellent video from Gunwerks that explains Bullet Stabilization.

This animated video starts by showing the design/shape differences between an older-style rifle bullet and a newer VLD-style bullet with higher BCs (Ballistic Coefficients). Generally speaking, the longer a bullet gets relative to diameter, the more RPM is required for stability. And to achieve that higher RPM you need more barrel twist and/or more RPM. The video illustrates where the Center of Gravity and the Center of Pressure are located. These are farther apart (in relative terms) for a VLD or Hybrid-style, long-nose bullet.

gunwerks bullet stability barrel twist rate video animation

When the bullet is in flight there is an angle of attack. This is exaggerated in the animation for illustration purposes, but it is important to understand the the attack angle affect stability. The rotation rate (Revolutions Per Minute) is a function of bullet velocity as it leaves the muzzle and the twist rate of the barrel. Since long VLD-style bullets need more stability, the barrel twist rate needs to be higher than with shorter, fatter bullets. This is pretty much try for all calibers.

The importance of adequate barrel twist rates for bullet stabilization is further discussed in this next video featuring Bryan Litz of Applied Ballistics:

Bullet Stability and Twist Rates

In this video, Bryan Litz talks about bullet in-flight stability and how to calculate barrel twist-rate requirements for long-range bullets. Bryan explains that bullet stability (for conventional projectiles) is basically provided by the spinning of the bullet. But this spin rate is a function of BOTH the nominal twist rate of the barrel AND the velocity of the projectile. Thus, when shooting the same bullet, a very high-speed cartridge may work with a slower barrel twist rate than is required for a lower-speed (less powerful) cartridge. For match bullets, shot at ranges to 1000 yards and beyond, Bryan recommends a twist rate that offers good stability.

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April 19th, 2022

Shipping Long Guns Via the U.S. Postal Service — Rules and Regs

U.S. postal service mailing rifle shotgun handgun FFL regulations

The United States Postal Service allows shipment of long-barreled rifles and shotguns via the U.S. Mail. However, regular citizens who do not possess an FFL are NOT allowed to mail handguns at all.* You must use UPS for handguns (or ship via an FFL). While the USPS allows rifle and shotgun mailing there ARE many rules and regulations with which long gun shippers must comply. Here are key USPS Gun Shipping Rules from the official USPS website. CLICK HERE to Read All Gun Shipping Rules.

U.S. Postal Service Rifle and Shotgun Shipping Rules

Source: https://pe.usps.com/text/pub52/pub52c4_009.htm

432.1 General
Mailers must comply with the Gun Control Act of 1968, all of the provisions of postal law in 18 U.S.C. 1715, and all other all federal and state regulations and local ordinances affecting the movement of firearms. The following also applies:

a. The Postal Service may require the mailer to open parcels containing firearms or air guns or give written certification that the weapon is unloaded and not concealable (see note 1).
b. Short-barreled rifles or shotguns that can be concealed on the person are nonmailable.
c. No markings of any kind that indicate the nature of the contents may be placed on the outside wrapper or container of any mailpiece containing firearms.
d. Mailable matter must be properly and securely packaged within the general packaging requirements in DMM 601.1-7.
e. Except for shipments between licensed dealers, manufacturers, or importers, all regulated firearms must be mailed using a USPS product or Extra Service that provides tracking and signature capture at delivery (see note 2).

U.S. postal service mailing rifle shotgun handgun FFL regulations

432.3 Rifles and Shotguns​
Except under 431.2, unloaded rifles and shotguns are mailable. Mailers must comply with the rules and regulations under 27 CFR, Part 478, as well as state and local laws. The mailer may be required by the USPS to establish, by opening the parcel or by written certification, that the rifle or shotgun is unloaded and not ineligible for mailing (see note 1). The following conditions also apply:

a. Subject to state, territory, or district regulations, rifles and shotguns may be mailed without restriction when intended for delivery within the same state of mailing. These items must:

    1. Bear a “Return Service Requested” endorsement.
    2.Be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.

b. A rifle or shotgun owned by a non-FFL may be mailed outside the owner’s state of residence by the owner to himself or herself, in care of another person in the other state where he or she intends to hunt or engage in any other lawful activity. These mailpieces must:

    1. Be addressed to the owner.
    2. Include the “in the care of” endorsement immediately preceding the name of the applicable temporary custodian.
    3. Be opened by the rifle or shotgun owner only.
    4. Be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.

d. Mailing of rifles and shotguns between licensed FFL dealers, manufacturers, or importers are not restricted. The Postal Service recommends that these items be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.

e. Except as described in 432.3a, licensed curio and relic collectors may mail firearms meeting the definition of curios or relics under 27 CFR 478.11 domestically to licensed FFL curio and relic collectors in any state. These items must be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.

f. Firearms meeting the definition of a rifle or shotgun under 431.4 which are certified by the curator of a municipal, state, or federal museum, which exhibits firearms to be curios or relics of museum interest, may be accepted for mailing without restriction when mailed between governmental museums.

g. Air guns (see 431.6) that do not fall within the definition of firearms under 431.1a are mailable. A shipment containing an air gun with a muzzle velocity of 400 or more feet per second (fps) must include an adult signature service under DMM 503.8. Mailers must additionally comply with all applicable state and local regulations.

FOUR TIPS for Safer, More Secure USPS Firearms Shipping

Here are some other helpful suggestions when shipping long guns via USPS:

1. Bring a copy of the destination FFL holder’s license to the Post Office, just in case the staff asks for confirmation.
2. Use a Shipping Mode that Requires Signature on Delivery for confirmation.
3. Ship Priority Mail for faster delivery and BUY INSURANCE to cover complete replacement value of the firearms. Some guns may be damaged, but insurance is needed to cover full gun value with a lost/stolen shipment.
4. Double tape the ends of the box, and put plenty of padding around the muzzle and buttstock INSIDE the box.


* While ordinary (non-FFL) person may never mail handguns, there are some types of handgun mail shipments allowed by manufacturers etc. to Government and U.S. Military recipients:

432.21 Authorized Persons
Subject to 432.22, handguns may be mailed by a licensed manufacturer of firearms, a licensed dealer of firearms, a licensed importer of firearms, or an authorized agent of the federal government or the government of a state, territory, or district, only when addressed to a person in one of the following categories for use in the person’s official duties, and upon filing the required affidavit or certificate:

a. Officers of the Army, Coast Guard, Air Force, Navy, Marine Corps, or Organized Reserve Corps.
b. Officers of the National Guard or militia of a state, territory, or district.
c. Officers of the United States or of a state, territory, or district, whose official duty is to serve warrants of arrest or commitment.
d. USPS employees authorized by the Chief Postal Inspector.
e. Officers and employees of enforcement agencies of the United States.
f. Watchmen engaged in guarding the property of the United States, a state, territory, or district.
g. Purchasing agent or other designated member of agencies employing officers and employees included in 432.21c through e.

432.23 Manufacturers, Dealers, and Importers
Handguns may also be mailed between licensed manufacturers of firearms, licensed dealers of firearms, and licensed importers of firearms in customary trade shipments, or for repairing or replacing parts.

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