November 12th, 2019

CMP & NRA 2020 Nat’l Matches at Camp Perry, Camp Atterbury

national matches cmp nra 2020 calendar

Good news — the NRA and the CMP are coordinating the schedules of their respective pistol and rifle National Match and Championship events at Camp Perry (CMP) and Camp Atterbury (NRA) in 2020. This should allow competitors to shoot ALL their favorite events, without conflict. Coordinating CMP/NRA event schedules will also help competitors save on travel time and expense.

CMP’s Programs Chief, Christie Sewell and NRA’s Cole McCulloch, Director of Competitive Shooting, said jointly: “It’s important that competitors of both organizations have the opportunity to shoot matches of their choice without conflicting dates, by event.”

Key 2020 National Matches Dates:
NRA National Matches First Shot Ceremony — July 1, 2020
NRA National Matches Pistol Championships — July 1-5, 2020
CMP National Matches First Shot Ceremony — July 7, 2020
CMP National Matches Pistol Championships — July 7-12, 2020
CMP Smallbore Championships — July 14-22, 2020
CMP High Power Rifle Championships — July 21-31, 2020
CMP National Games Events — July 30 – August 3, 2020
CMP Long Range Matches Camp Perry — August 4-8, 2020
NRA Smallbore Championships — July 23 – August 5, 2020
NRA High Power Rifle Championships — August 9-15, 2020
NRA Mid-Range Rifle Championships — August 16-20, 2020
NRA Long Range Rifle Championships — August 21-25, 2020

national matches cmp nra 2020 calendar

CLICK HERE for Full-Size 2020 Nat’l Match Calendar PDF »

CMP National Matches Program 2020 at Camp Perry
The CMP will open the National Matches at Camp Perry with its First Shot Ceremony and pistol matches on Tuesday, July 7. CMP pistol events will run through Sunday, July 12. CMP Smallbore rifle check-in and practice will commence on Tuesday, July 14 and matches will run for a week with championships and prone awards on Wednesday, July 22. CMP’s Rimfire Sporter Match and CMP Junior Smallbore camp will also be completed during that period.

CMP Cup High Power Rifle matches begin Tuesday, July 21 and will conclude with a CMP Cup awards ceremony on July 23. CMP Rifle Clinics will begin July 24 and conclude July 26. CMP’s National Trophy Rifle Matches will begin July 27 – July 31, with CMP National Games Events July 30 – August 3. CMP Long Range matches open on Tuesday, August 4 and conclude with the CMP Palma Rifle match and Long Range awards on Saturday, August 8. All CMP events will continue to be held at Camp Perry in Port Clinton, Ohio.

NRA National Matches Program 2020 at Camp Atterbury
The NRA Pistol Championships run July 1-5, 2020. NRA Smallbore 3P Rifle begins on Thursday, July 23 and concludes Tuesday, August 4 with a final awards ceremony. NRA High Power Rifle commences on Monday, August 9 and concludes with an awards ceremony on Saturday, August 15. NRA Mid-Range Rifle opens on Sunday, August 16 and closes on Thursday, August 20 with an awards ceremony. NRA Long Range Rifle begins Friday, August 21 and concludes Tuesday, August 25 with the final awards ceremony.

For more information CLICK these links:

CMP National Matches at Camp Perry | NRA National Matches at Camp Atterbury

NRA CMP matches map indiana camp perry atterbury

Permalink Competition, News 1 Comment »
November 12th, 2019

Bullet RPM and Drag — How BC Changes with Bullet Spin Rates

Bryan Litz bullet rpm BC Drag ballistics coefficient twist rate

You may not realize it… but to get the optimum BC from your bullets (i.e. the lowest aerodynamic drag), you must spin the bullets fast enough. Bullet drag increases (as expressed by lower BC) if the bullet spins too slowly. Bryan Litz of Applied Ballistics explains how BC changes with twist rates…

More Spin, Less Drag
In this article, we look at how twist rate and stability affect the Ballistic Coefficient (BC) of a bullet. Again, this topic is covered in detail in the Modern Advancements book. Through our testing, we’ve learned that adequate spin-stabilization is important to achieving the best BC (and lowest drag). In other words, if you don’t spin your bullets fast enough (with sufficient twist rate), the BC of your bullets may be less than optimal. That means, in practical terms, that your bullets drop more quickly and deflect more in the wind (other factors being equal). Spin your bullets faster, and you can optimize your BC for best performance.

Any test that’s designed to study BC effects has to be carefully controlled in the sense that the variables are isolated. To this end, barrels were ordered from a single barrel smith, chambered and headspaced to the same rifle, with the only difference being the twist rate of the barrels. In this test, 3 pairs of barrels were used. In .224 caliber, 1:9” and 1:7” twist. In .243 caliber it was 1:10” and 1:8”, and in .30 caliber it was 1:12” and 1:10”. Other than the twist rates, each pair of barrels was identical in length, contour, and had similar round counts. Here is a barrel rack at the Applied Ballistics Lab:

Applied Ballistics used multiple barrels to study how twist rate affects BC.

stability gyroscopic ballistics coefficient drag twist rate

“The Modern Advancements series is basically a journal of the ongoing R&D efforts of the Applied Ballistics Laboratory. The goal of the series is to share what we’re learning about ballistics so others can benefit.” –Bryan Litz

Barrel twist rate along with velocity, atmospherics, and bullet design all combine to result in a Gyroscopic Stability Factor (SG). It’s the SG that actually correlates to BC. The testing revealed that if you get SG above 1.5, the BC may improve slightly with faster twist (higher SG), but it’s very difficult to see. However, BC drops off very quickly for SGs below 1.5. This can be seen in the figure below from Modern Advancements in Long Range Shooting.

The chart shows that when the Gyroscopic Stability Factor (SG) is above 1.5, BC is mostly constant. But if SG falls below 1.5, BC drops off dramatically.
stability gyroscopic ballistics coefficient drag twist rate

Note that the BC drops by about 3% for every 0.1 that SG falls below 1.5. The data supports a correlation coefficient of 0.87 for this relationship. That means the 3% per 0.1 unit of SG is an accurate trend, but isn’t necessarily exact for every scenario.

It’s a common assumption that if a shooter is seeing great groups and round holes, that he’s seeing the full potential BC of the bullets. These tests did not support that assumption. It’s quite common to shoot very tight groups and have round bullet holes while your BC is compromised by as much as 10% or more. This is probably the most practical and important take-away from this test.

To calculate the SG of your bullets in your rifle, visit the Berger Bullets online stability calculator. This FREE calculator will show you the SG of your bullets, as well as indicate if your BC will be compromised (and by how much) if the SG is below 1.5. With the stated twist rate of your barrel, if your selected bullet shows an SG of 1.5 (or less), the calculator will suggest alternate bullets that will fully stabilize in your rifle. This valuable online resource is based directly on live fire testing. You can use the SG Calculator for free on the web — you don’t need to download software.

(more…)

Permalink Bullets, Brass, Ammo, Tech Tip 2 Comments »
November 12th, 2019

See Bullet Holes at 500+ with White Background Splatter Targets

shoot-n-c sight-in-target white black halo

Do you have trouble seeing your bullet holes (on paper) when shooting past 400 yards? That’s a common issue even with premium ($1600+) high-magnification scopes. Here’s a target that solves that problem. A hit creates a larger black circle that’s much more visible than a plain bullet hole, making this target ideal for use at longer range (500 yards and beyond).

The 12″ square Birchwood Casey white background Sight-In Target displays a black “halo” around each hit (like the yellow circle on a conventional Shoot-N-C). Larger than bullet diameter, the “halos” can be easily seen with a high-magnification scope at long range (see video below). The self-adhesive target features four diamonds with contrasting red box centers. For precise aiming, you can position your cross-hairs to align with the corners of the boxes. Or, you can put a target dot sticker in the middle.

This video shows Black Shot Halos on white background:

White splatter targetWhile we envision using this target with optics at long range, Birchwood Casey says that open sights show up well against the white background, making these targets well-suited for indoor ranges or use in low light conditions.

This white background grid target has five aiming points and a 1-inch grid overlay for quick and easy sight adjustments. It comes with target pasters that allow shooters to cover up bullet holes and continue using the target for added value. The White/Black Shoot-N-C 12″ Sight-In Targets come in packs of five with 75 target pasters for around $7.00 on Amazon. If you prefer circle targets, there is also an even larger 17.5″ Shoot-N-C target with one large bull with red diamond center (photo right).

High-Viz Option — Yellow on Black Grid with Yellow Halos

If you prefer seeing ultra-high-contrast yellow/green “halos” for your hits, Birchwood Casey also makes adhesive grid targets with five yellow-edged diamonds. Red circles provide precise aiming points in the middle of each box. You can quickly estimate group size or dial-in your zero using the hi-viz yellow 1″ grid lines. These yellow-on-black targets are available in three sizes: 8″ square, 12″ square, and 17.5″ square. These yellow-on-black grid targets start at $6.80 for an 8″ five-pack.

shoot-n-c sight-in-target white black halo

Permalink Gear Review, Shooting Skills 1 Comment »