November 10th, 2018

The Moly Saga — Why Moly-Coating Has Fallen from Favor

Glen Zediker Molybdenum Moly bullets moly-coated Top Grade Ammo book Handloading Competition

Moly — yay or nay? Moly bullet-coating was all the rage in 1998 yet is all but dead in 2018. Glen Zediker, who has considerable experience with moly, provides some reasons why moly coating has fallen from favor.

The Pros and Cons of Moly Coating for Bullets

by Glen Zediker
In a way, I guess nothing really happened to molybdenum-disulfide-coated bullets (“moly-coated”). They’re still for sale, as are means to make up your own. What I mean is why didn’t they attain the sustained popularity they started with about 20 years ago, back when many forecasted they would virtually replace bare bullets? Here’s my take, from my experience, on “what happened.”

I don’t know any shooter who tried them and wasn’t excited about results. I sure was!

Performance-wise, moly has a lot of benefits. A lot. The first and most: take two bullets, one coated and one bare, put the same load behind them, then shoot and chronograph. The coated bullet goes slower. How is that a help? The reason it goes slower is because moly drops chamber pressure (into and through the bore easier). And! That velocity loss (at least 50 fps, usually more) is not, proportionately, nearly as much as the accompanying drop in pressure (usually ballpark 4000+ psi). (These figures vary with the cartridge, but all show similar universal influence.) So. The moly-load can be increased beyond previous “maximum” velocity: the idea is to take the coated load up to normal chamber pressure. It works! It’s common to need at the least 1+ grain more propellant to level the coated load with the original bare-bullet load.

Other advantages: Most see improved velocity consistency, evidently resulting from the coating alone. The coated bullets seem to have no limit to the number of rounds that can be fired with no change in accuracy or impact location. Of course there is a limit, but I knew many going beyond 500 rounds between cleanings. And when I say “many,” I’m talking about serious competitive shooters. Another benefit is increased barrel life (less rapid throat erosion), and this is, I think, due to a faster-accelerating bullet getting into and through the throat more quickly (less intense flame). Moly bullets also release easier from the case neck (additional “tension” is recommended).

I “switched.” (The motivation to write this came from a weekend shop-cleaning where I restacked many boxes of coated bullets, and wondered if I’d ever shoot them…)

I got more bullet speed and zero loss of zero — big benefits to an NRA High Power Service Rifle shooter. 88 rounds per day, and 80gr bullets through a 20-inch barrel trying their best to get to 600 yards in close proximity of one another.

Glen Zediker Molybdenum Moly bullets moly-coated Top Grade Ammo book Handloading Competition
Here was my solution to cleaning up after moly: Kroil penetrating oil and abrasive-type bore paste. This combination worked, and my zero didn’t change in the process.

Cleaning Barrels Used for Moly-Coated Bullets
What is bad, then, about moly-coated bullets? Moly itself! It coats the bore with a layer of residue. This layer traps moisture and will, not can, corrode the steel underneath it. More: molybdenum disulfide outgases (outgas is the release of an occluded gas vapor that was part of the compound; a state change, pretty much) at lower than firing temperatures. That creates a chemical that, when mixed with water (including post-firing condensation), becomes, pretty much, sulfuric acid. That meant that the whole “zillion rounds between cleanings” didn’t really work. I know many who “lost” barrels, expensive barrels.

If the barrel is cleaned (correctly) after each use, no problems. But then another advantage is lost because starting with a clean barrel it takes quite a few rounds to return to zero. The layer has to be recreated.

The residue is difficult to remove from the bore. It doesn’t respond to routine means for bore maintenance, mostly meaning brush-and-solvent. The only way I found to get it gone was using micro-penetrating oil in conjunction with an abrasive paste-type cleaner, such as USP Bore Paste or JB Bore Compound.

boron nitride moly coating
Hexagonal Boron Nitride (HBN) bullet coating is an alternative that functions, in my experience, well but with fewer drawbacks. First, BN is “clear”, not as messy. Bullet on the left is HBN coated. Still, though, I think that shooting coated bullets is an “all or nothing” proposition. Good groups are not likely to come “mixing” bare and coated bullets through the same barrel.

Using Coated Bullets Requires Commitment
I no longer use coated bullets. There are other coatings that have fewer disadvantages, such as Hexagonal Boron Nitride (doesn’t outgas). Some of the proprietary baked-on coatings a few major makers (such as Barnes and Winchester) use don’t exhibit the post-firing issues that “conventional” moly-coating creates (which usually was moly powder, followed by wax, which added to the tenacity of the residue).

However, another issue is that accuracy tends to suffer running bare bullets though a residue-coated bore (which results after only a few coated rounds, that are coated with anything). All that means, in short, is that running coated bullets is something that really has to be bought into. It’s a commitment, as I see it, and, as with many such things, pushing the limits on performance requires more attention to detail, more effort. It’s a matter of value.

Glen Zediker Molybdenum Moly bullets moly-coated Top Grade Ammo book Handloading Competition

Here’s an easy way to get bullets coated: Lyman’s Super Moly Kit. Just add a tumbler. The two bowls contain the media, moly, and bullets and then go into a vibratory-type tumbler. The 6 ounces worth of moly powder will coat thousands of bullets. It works well.

Deciding Whether to Use Coated Bullets
Weigh the pros and cons. I honestly cannot, and will not, tell anyone not to use coated bullets. Coating can provide a serious performance increase. I don’t use moly-coating anymore, but that’s because my shooting needs are not so “serious” as they once were. I, yes, have gotten a tad amount lazy. I want to go to the range and enjoy my rifles and not lose sleep over the possibility of creeping corrosion if I didn’t clean up. I also want to be able to shoot different loads, including factory ammo, and maintain accuracy.

CONCLUSION: IF you choose moly, take steps to protect the barrel bore against the potential for damage. At the least, run some petroleum-based oil through the bore after shooting if you can’t clean it soon.

See what Midsouth offers HERE.

This article is adapted from Glen’s books, Handloading For Competition and Top-Grade Ammo, available at Midsouth. For more information about other books by Glen, visit ZedikerPublishing.com.

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Permalink Bullets, Brass, Ammo, Reloading, Tech Tip 4 Comments »
November 10th, 2018

Excellent Selection of Gun Books at Midsouth Shooters Supply

Krause book reloading shooting midsouth resource

It’s the holiday season — there’s no better time to sit in front of a fire and read a good gun book. Midsouth Shooters Supply now carries the full line of shooting and reloading books from Krause Publications at very attractive prices. Looking for reliable reference works on reloading, or a gift for a shooting buddy? You’ll find something worthwhile among the Krause library of gun books, which includes the respected Gun Digest Shooter’s Guides. Match directors also take note — books make great match prizes. Paperback books cost no more than wood plaques but they will provide valuable information for years instead of just gathering dust in a closet. If your club offers training programs, Krause offers many titles that will help new shooters improve their skills.

Midsouth carries Glen Zediker’s excellent books, including Handloading For Competition, the recent Top-Grade Ammo and other titles.

Glen Zediker Handloading for Competition Glen Zediker Top Grade Ammo

Here Are Some of Our favorite Krause Shooting and Reloading Titles:

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Krause book reloading shooting midsouth resource Krause book reloading shooting midsouth resource
Krause book reloading shooting midsouth resource Krause book reloading shooting midsouth resource
Krause book reloading shooting midsouth resource Krause book reloading shooting midsouth resource
Permalink Handguns, Reloading, Shooting Skills 2 Comments »
November 10th, 2018

Enhance Mental Function to Shoot Better Scores

Shooting Sports USA Brain mental game psychology cerebellum

Looking to improve your competition skills? The Shooting Sports USA website has scores of informative articles that can help your score higher at your next shooting tournament. You’ll find articles on wind reading, position shooting, match strategies, and much more.

One great Shooting Sports USA article, Shooting is 90% Mental, was penned by Chip Lohman (SSUSA’s former Editor). With the help of two very smart Ph.D types, Judy Tant and Mike Keyes, Lohman examines the mental processes involved in the shooting sports. Chip’s co-authors have impressive credentials. Dr. Judy Tant is a Clinical Psychologist and National Bullseye Pistol Champion. Dr. Michael J. Keyes, is a licensed Psychiatrist and former physician for the U.S. Shooting Team.

CLICK HERE to Read Full Article in Shooting Sports USA Online Magazine.

Visualization, Brain Function, and Muscle Memory
If you shoot competitively, this is definitely a “must-read” article. The authors examine how the brain functions under stress, how “visualization” can be used to improved performance, how “brain speed” can be enhanced through proper training, and how the brain stores learned routines into “muscle memory.” And that’s just for starters — the article gives many concrete examples of techniques top shooters have employed to improve their “mental game” and shoot higher scores.

Brain Speed and Trigger Control:
Shooting Sports USA Brain mental game psychology cerebellumResearch: Scientists believe that the newer frontal lobe may not be able to keep up with “deep” brain signals that transmit at nearly 300 mph. This is explained when athletes talk about “letting go,” rather than over-thinking the shot. This conscious signal can take up to 0.3 seconds from recognizing the desired sight picture to moving the trigger finger — too long to capture the opportunity for a perfect shot. However, if the signal is initiated spontaneously in the cerebellum where such procedures are thought to be stored through repetition, the reaction speed is much quicker. Signals are processed by the “deep brain” almost twice as fast as the problem-solving frontal lobes.

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