Sierra’s new 110gr 6mm MatchKing is so new you won’t even find it on Sierra’s website. But MidwayUSA has it listed as “coming soon”. This new bullet, optimized for a 1:7″-twist barrel, promises class-leading ballistics. The listed G1 Ballistic Coefficient (BC) is an impressive 0.617 (sorry, no G7 BC has been stated). That’s 12.8% higher than the 0.547 G1 BC Sierra claims for its older 107gr MatchKing. That’s a very significant improvement. We attribute the reduced drag of the new 110-grainer to an improved hybrid-ogive bullet shape along with much smaller meplats. Sierra has not yet confirmed that it is pointing the meplats of the new 6mm 110s at the factory, but we expect that may be the case. In this respect the 110-grainers could be like Sierra’s excellent 183gr 7mm MatchKings, which come with tight, pointed tips right out of the box.
G1 vs. G7 and Listed BCs vs. Tested BCs — What You Need to Know
Manufacturer-listed G1 Ballistic Coefficients of 6mm Match Bullets
If you look at the table above you’ll see that Sierra’s claimed 0.617 G1 BC for the new 110gr MK is higher than the 0.536 Berger lists for its 105gr 6mm Hybrid and higher than the 0.536 Hornady lists for the new 108gr 6mm ELD Bullet. We do think Sierra’s 110-grainer will prove to have the highest BC of the bunch, based on recent comparison tests by Sierra.
Let’s explain… Sierra lists a 0.547 G1 BC for its 107-grain MatchKing. Sierra tells us that the the .547 listed BC is for the current lots of 107-grainers which are pointed by Sierra. Sierra’s Matt Reams states that the new 110-grainers definitely have less drag than the current Sierra 107gr MKs or Berger 105gr Hybrids: “We have shot the pointed 107s side by side (raced) in our 300-meter range next to the [Berger] 105s and our pointed 107s had a higher BC between those two lots. In the comparison we did, our lot of new pointed 107s had a slightly higher BC than the [Berger] 105s. The 110s are significantly higher than both.”
In the real world, Sierra’s new 110gr 6mm MatchKing may not have as big an edge over the competition as it seems from Sierra’s claimed 0.617 G1 BC. (The G7 numbers may be closer.) Nonetheless, we do expect that Sierra’s new 110-grainer will be very competitive, and may actually have best-in-class BC. And if the new 110gr SMKs come “tipped” from the factory that will be a very good thing.
Anybody currently shooting a heavy 6mm bullet in competition should look at the new 110gr MatchKing when it becomes available. It could prove to be a winner. NOTE However — Sierra recommends a true 1:7″-twist barrel to stabilize the new 110-grainers.
New Product Tip from Boyd Allen. We welcome reader submissions.
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Stan Pate is the first-ever F-TR competitor to earn International Distinguished Rifleman honors in his discipline. We congratulate Stan for that achievement. As a long-time competitor, Pate has earned numerous honors throughout his shooting career. The International Distinguished Rifleman award is a culmination of decades of hard work and dedication to the shooting sports.
“To earn the International Distinguished Badge, especially as the first F-T/R shooter to do so, is the pinnacle of my competitive shooting career,” Pate said. “I’m honored to share this award with all of those who have supported me, especially Leupold[.]”
The coveted International Distinguished Rifleman Badge is earned by accumulating points at authorized matches. In the USA, this program is overseen by the National Rifle Association. International Distinguished points can only be earned at authorized international competitions. Points can be earned for the International Distinguished award at World Championships, the America Match, and the Australia Match. A total of 30 points must be earned to be recognized as International Distinguished.
“Stan represents the pinnacle of his sport and we’re honored to call him a friend and a partner,” said Rob Morrison, vice president of global marketing for Leupold & Stevens. “His tenacity and perseverance in competition demand that his optics perform at a similar level, which is why he chooses Leupold.”
Watch Video for Tips from Past National F-TR Team Members Mike Miller and Stan Pate
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If you’re shopping for a heavy-duty, single-stage reloading press, there’s a new option you should consider. MEC, noted for its shotshell reloading machines, has just introduced an all-new, cast-iron press, the MEC Marksman press. This new single-stage press has features we really like. First, the beefy, cast-iron frame is strong enough for the toughest reloading jobs. Second, the MEC Marksman features an OPEN front — that smart design makes it easier to insert and remove cartridge cases during the reloading process. It also makes it much easier to place your bullets during the seating stage. This open-front design makes good sense — note that Hornady’s new LNL single-stage press also has an open-front layout for important reasons. Lastly the MEC Marksman has an innovative, self-centering shell-holder. This patent-pending design should help hand-loaders reload more efficiently.
MEC MARKSMAN
Manufacturer’s Product Description
The MEC Marksman is made from ductile cast iron for superior quality and durability. Our patent-pending self-centering shell holder provides greater accuracy and consistency to every reload. The MEC Marksman is compatible with all 7/8-14 thread dies to change calibers quickly. Reload .22 Hornet to .416 Rigby all with one convenient machine. The MEC Marksman single-stage metallic reloader and accessory products are made in the USA in Mayville, Wisconsin.
In addition to the MEC Marksman, MEC’s new Metallic line of products will include reloading accessories. Powder measure, powder trickler, scale, and calipers will be offered. An additional base is available for easy installation and is compatible with the MEC Jig Fixture mounting system. Case prep tools and components are also available.
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Nosler recently introduced a new series of high-BC bullets with factory-closed meplats. Bryan Litz’s team at Applied Ballistics is now testing these new Reduced Drag Factor (RDF) projectiles to determine their performance — and specifically to see if the BCs are as high as claimed. Nosler bullet testing is underway this week and Litz hopes to bring the results to the Applied Ballistics Seminar in North Carolina later this week (November 3-4, 2016).
Applied Ballistics Seminar Fall 2016: November 3 – 4, 2016 – Caraway Conference Center
4756 Caraway Mountain Road Sophia, NC 27350; Phone: (336) 629-2374. Seminar Sign-Up.
Bryan notes: “If you live in the Southeast region, this is the last seminar for you for at least a year, possibly longer. We will most likely do the next seminars in regions not yet visited.”
Applied Ballistics Library Update
Bryan Litz is hard at work testing new projectiles: “We are currently in the middle of testing all these new offerings that have recently come out. In fact, the lab is up and running today, with some of the new Nosler RDFs going down range. Bullet measurements have been taken with our state-of-the-art digital comparator which is accurate to within 0.0001″. For example, shown below are the measured dimensions for the new Nosler RDF .308 175 grain projectile. For these new bullets, we will not only have complete BC measurements accurate to ± 1%, but we will have Custom Drag Models (CDMs) coming as well.”
New Data Coming Soon
Bryan hopes to present the new Nosler data at the Seminar this week in North Carolina. In addition, Bryan is developing information for the Hornady ELD bullets, G9 Competition Series solid bullets, some new Sierras, and some other projectiles not currently in the library: “Once we complete testing on all these new offerings, we will then compile the library for the next library update (which will be done across all platforms). We want to make sure that none of these new offerings are left out. For those who want to see some of the early results, come join us at this final seminar of 2016!”
Custom Drag Models
Applied Ballistics has been providing custom drag models for use in trajectory prediction for the past several years. Custom Drag Models (CDMs) for bullets are a more refined way of modeling drag for bullets because you’re not referencing a standard like G1 or G7, rather you’re using the actual measured drag of a specific bullet in a ballistic solver. This results in more accurate trajectory predictions, especially through transonic.
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We are sad to report that long-time Forum member Frank S. (aka fdShuster) passed away last year. Frank was a very knowledgeable shooter who was always willing to help others. Here is one of Frank’s smart inventions. He devised a way to measure the length of a rifle’s chamber using a fired cartridge case. This lets you find your MAX trim-to-length for any chamber. Frank’s system works by cutting a “collar” from part of the case neck. This then slips over a bullet seated in a case loaded without powder or primer. As you chamber the dummy round, the collar will move back to indicate the full length of the chamber. (Make sure the bullet is seated well off the lands so the dummy round can chamber fully.)
The pictured gauge can be home made (for free) with components you already have on hand. Frank explained: “I used a Dremel cut-off wheel to cut the front half of the case neck off. A jewelers needle file to de-burr both rough-cut edges. The cut-off surface does not need to be perfectly square, because you are using the original straight mouth to make contact at the front of the chamber. Seat any old bullet to the approximate normal seating length. Next apply a tiny drop of oil on the ogive of the bullet, and slide the ‘collar’ over the bullet. Then chamber the dummy round and close the bolt. Extract the round slowly and carefully and take the measurement with calipers (see top photo).”
Frank’s DIY chamber length gauge works well. In a related Forum thread, Frank posted: “I’ve compared length dimensions doing it this way and with the chamber length shown on my chambering reamer drawings, and the Sinclair gauge, and they are all within .001″ or so.”
Commercial Chamber Length Gauges May Not Work with Custom Chambers
Frank did use Sinclair chamber-length gauges for some applications. These bullet-shaped gauges slip into a cartridge, but “it’s inconvenient to order that little gauge only… without spending $6 shipping for a $7 item.” Moreover, the Sinclair gauges may not fit a custom chamber with a tighter neck dimension because the diameter of the ring at the end is too large.
As an alternative to commercial gauges, the collar-type, homemade gauge will function properly in a custom chamber. The homemade gauge will work with smaller-than-standard chamber neck dimensions, as long as you use a piece of appropriately-turned fired brass that fits your chamber.
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The election is now just one week away. This is not just about who will become President. With Supreme Court appointments at stake, this election could have significant, long-term consequences for gun owners’ rights under the Second Amendment. We may be at an historic juncture in our nation’s history. If control of the U.S. House and Senate changes, and if anti-Second Amendment Supreme Court Justices are appointed, then things could change in very bad ways for the shooting sports. In the video below, National Shooting Sports Foundation President/CEO Steve Sanetti asks all gun owners to go to the polls armed with the facts. Exercise your right to vote. Remember, every vote counts.
Message from Steve Sanetti:
The lawful commerce in firearms and [your] rights … to enjoy the shooting sports are squarely at issue this year.
And this election is about far more than just the Presidential candidates. Control of both Houses of Congress, the Supreme Court, and all the important appointments and executive orders that the next President can make, are all at stake.
And your State and local elections can also affect your ability to enjoy your rights to manufacture, sell, own, and use firearms.
So please — don’t sit this one out. Your vote, and every vote, counts. Learn where all the candidates stand, talk to your family, your friends and your coworkers, and vote! This election is up to you, and America is counting on you!
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MEC MARKSMAN
Commercial Chamber Length Gauges May Not Work with Custom Chambers
