As an Amazon Associate, this site earns a commission from Amazon sales.











November 9th, 2018

Snakeskin Shooter for Santiago — Reptilian Eliseo R1 Rig

Santiago Tubegun Eliseo R1 Snakeskin Hydro-dip

Santiago Tubegun Eliseo R1 Snakeskin Hydro-dip

Santiago Tubegun Eliseo R1 Snakeskin Hydro-dipA 7mm Snake for Santiago
Our friend Dennis Santiago has a reptilian rig in his arsenal. It’s actually an Eliseo R1 single-shot tubegun chambered in .284 Winchester. The eye-catching aspect of Santiago’s .284 bolt-gun is the snakeskin dip job on the exterior. This really creates a distinctive look. Dennis tells us: “It was Gary Eliseo’s idea to try a water-transfer printing finish for this rifle. There are many patterns to choose from — this is the WTP-260 Snakeskin Illusion-Fall Copper from WaterTransferPrinting.com. For a single shot LR gun, I figured something on the bright side would be interesting and pick up less heat from the sun in the summer.”

Dennis uses this eye-catching rifle in prone matches, where a single shot works fine. He says: “Underneath the hood, it’s a Rem 700 Long Action, chambered in .284 Win. Yes it’s a single shot! I don’t need anything else for a prone gun. Nothing to get in the way of building the perfect position.”

Dennis says: “Length of pull, offset and cast initially set the same as my similar RTS .308. My gun, my body dimensions.”
Santiago Tubegun Eliseo R1 Snakeskin Hydro-dip

R1 Testing with Advanced Electronic Shot-Plotting System
Now that winter is here, Dennis plans to do some serious load development with this rifle: “I acquired a new ShotMarker electronic target system. I’ll be using that to test a variety of powders and bullets.” Dennis has previously loaded his .284 Win R1 with Hodgdon H4831 powder, but he hopes to test alternatives from Alliant and IMR as well. There are many interesting 7mm bullet options, such as Sierra’s impressive, factory-pointed 183gr MatchKing with 0.707 G1 BC, and Berger’s new 184gr F-Open Target Hybrid with 0.695 G1 BC.

Shot-Marker shotmarker electronic target system acoustic target

The ShotMarker is a unique 8-sensor acoustic electronic target that instantly plots shot locations and transmits the data via WiFi to a mobile device. Dennis is eager to try his new Shot-Marker. The system can measure group size, velocity, and SD. The Shot-Marker App can then store your strings for later review, add notes to the target, and export data to spreadsheets.

Shot-Marker shotmarker electronic target system acoustic target

A FFP 6-24x50mm Sightron Rides on Top
The optic is a Sightron 6-24x50mm, FFP MOA-2. Dennis reports: “I looked at many scopes (within my determined price range), and this is the one that had the best combination of features for for this gun’s particular application. The sight line sits about 3 inches above bore line on these guns. It’s been leveled, bore-sighted and pre-dialed for a 200-yard estimated zero for the ammo I plan to use. Those are Gen II A.R.M.S. rings. Super easy to tailor to different rail widths. Same rock-steady steel performance.”

Santiago Tubegun Eliseo R1 Snakeskin Hydro-dip

Santiago Tubegun Eliseo R1 Snakeskin Hydro-dip

Permalink Bullets, Brass, Ammo, Gear Review No Comments »
August 3rd, 2017

7mm MatchKings for the F-Class World Championships

Sierra MatchKing 183gr 183 Grain Bullet BC Long Range F-Class

The F-Class World Championships (FCWC) in Canada are just one week away. This August 11-17, the world’s top F-Class shooters will gather at the Connaught Ranges outside Ottawa, Ontario. The vast majority of F-Open shooters will be running some kind of 7mm (.284 Caliber) cartridge, with the .284 Winchester, .284 Win Improveds, and 7mm RSAUMs being popular.

7mm .284 Winchester F-Class Bullet

For those of you who plan to compete but who haven’t loaded your ammo yet, you may want to consider a very good 7mm match bullet from Sierra, 183 grain MatchKing (item #1983). We have found the 183gr MK, which comes “pointed” from the factory, to be very consistent in weight and base-to ogive measurement. Top F-Open shooters have told us that these bullets shoot exceptionally well, with minimal vertical dispersion at 1000. “Holding waterline” at long range is a reliable indicator that the BC is very uniform from bullet to bullet.

Sierra’s popular 7mm 183 grain MatchKing boasts an impressive 0.707 G1 Ballistic Coefficient (BC) at 2300+ fps. These bullets also have very consistent bullet-to-bullet BC, thanks to very uniform jackets and the tips being “pointed” at the factory. Sierra explains: “A final meplat-reducing operation (pointing) provides an increased ballistic coefficient for optimal wind resistance and velocity retention.”

Insight Into Sierra’s New 7mm MatchKing®
by Sierra Product Development Manager Mark Walker

In late 2015, Sierra introduced a new 7mm MatchKing® bullet with a different type of ogive. As part of the introduction, I had the opportunity to use them at the F-Class Nationals held in Phoenix with very good results. While at the match, several people had questions about what exactly was different about the ogive on this bullet as opposed to our tried and true blended tangent ogive. So with that in mind, hopefully this blog will answer those questions.

In the past, Sierra has typically used a tangent radius ogive design on our MatchKing® bullets. This is one of the most forgiving ogive designs due to its ability to shoot extremely accurately when jumped, as well as, jammed into the rifling. On rare occasions, some of our MatchKing® bullets have used a secant ogive due to design constraints. However, this ogive is much more sensitive to changes in seating depth than the tangent ogive so we tend to shy away from it. When we decided to work on this new bullet, we wanted to see if we could improve on the accuracy of even our best shooting tangent ogive bullets.

Sierra MatchKing 183gr 183 Grain Bullet BC Long Range F-Class

One of the main factors of what makes an accurate shooting bullet is how it aligns itself with the bore when fired. If a bullet is slightly crooked when entering the bore, it will cause inaccuracy on the target. We set out trying to think of ways to make sure that the bullet has no choice but to align itself with the bore perfectly.

The first part of the barrel to encounter the bullet is the leade in the chamber. The leade is an angle that is cut into the leading edge of the rifling which helps to guide the bullet into the bore. To illustrate how current bullets fit into the leade, picture a cone (leade) with a ball (bullet) sitting inside it. The ball can be rotated in all directions and the cone cannot force the ball to orientate itself in any particular direction. When a bullet with a radius encounters the leade, it behaves in a similar way. Now this of course is a very simple example and of course advanced shooters use tight necks and brass that is perfectly formed to the chamber to make sure the bullet is aligned as perfect as possible. However, there is always a small element of misalignment that is possible even with all this precise preparation.

This brings us to the ogive on the new 7mm MatchKing®. We thought instead of using the typical ogive radius that can allow slight misalignment, why not use the same straight angle that is used in the chamber leade on the bullet ogive to force itself to always align with the bore? Imagine the same cone as above (leade) with an identical cone (bullet) sitting inside of it. The cone inside has no choice but to align itself perfectly with the cone that it is sitting in every time. With that in mind, we designed the area of the bullet which contacts the leade in front of the bearing surface using a straight 1 1/2 degree angle instead of the typical radius. Once past that area, we use a traditional high caliber ogive radius to provide a very sleek, high BC bullet.

I hope that explains our thought process behind this new bullet. In our testing, it is one of the most forgiving high-BC bullets we have ever made.

Permalink Bullets, Brass, Ammo, Gear Review 3 Comments »