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Posted: 9/17/2010 11:53:38 PM EDT
| Are "Moly Coated" bullets better than plain copper? I have read on the internet that they can cause corrosion problems in the gas system of semi auto rifles and that moly can build up in the barrel and damage it. Thank You |
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From my limited experience, I've seen not increase in accuracy with moly bullets.
When I was dialing in a cartridge for a BM varminter, I tried some BH moly rounds but didn't see any increase in accuracy over the same load with a copper bullet. Wasn't worth the extra money for me. YMMV |
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Moly only works if you pre-coat the bore with it manually first.  Care to explain?
Starting with a well-cleaned and dry bore, put some dry Moly powder on a snug patch. Burnish the bore with this patch, then run one clean/dry patch down the bore. Shoot moly-coated bullets. You'll see MUCH less fouling, allowing you to shoot longer strings between cleaning. This is a HUGE benefit when on an active Prairie Rat town. The benefits of less fouling are most evident with smooth bores - custom, hand-lapped (or button-rifled) barrels that show less fouling anyway can be shot a bunch before they need cleaning. Rough-as-a-cob factory barrels often show much less benefit from shooting moly. Moly does not build up over time, though it will lay down over old copper fouling. Cleaning can get interesting then! This is one reason why pre-treating with moly is important. Often, you'll see a slight drop in velocity because the bullets are entering the bore under less pressure. If you reload, this allows you to adjust your load to get higher velocity and stay within safe pressure limits. Wheatherby built their guns with lots of freebore to get the same pressure results. |
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Quoted:
Quoted:
Quoted:
Moly only works if you pre-coat the bore with it manually first. Care to explain?
Starting with a well-cleaned and dry bore, put some dry Moly powder on a snug patch. Burnish the bore with this patch, then run one clean/dry patch down the bore. Shoot moly-coated bullets. You'll see MUCH less fouling, allowing you to shoot longer strings between cleaning. This is a HUGE benefit when on an active Prairie Rat town. Moly does not build up over time, though it will lay down over old copper fouling. Often, you'll see a slight drop in velocity because the bullets are entering the bore under less pressure. If you reload, this allows you to adjust your load to get higher velocity and stay within safe pressure limits. Wheatherby built their guns with lots of freebore to get the same pressure results. Benchrest 101, Yes it does build up, thats why no one uses it. Some very easy comin knowledge, if it contacts the barrel it comes off and is deposited. It gets in your rifleing and kills your accuracy, and is much harder to remove. Brass brushes work if you have a little, but chemicals must be used if its a thick coat. If it didn't build up then there is no down side. |
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For starters use this, an overall good artical. http://www.sprinco.com/articles.html When moly came out years and years ago, I had a nice benchrest rifle built and asked Speedy Gonzales if moly is all its cracked up to be. He said don't ever use it, it builds up. That was when there was still an agrument if it did or not, now, everyone knows it builds up. Coming from a hall of fame best benchrest shooter, I believed it then and is proven now.
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Some have NEVER liked moly. Speedy is one; he advised against it from day one.
Shooter's News - the source of your article - didn't survive. I was a subscriber when it first came out and was never impressed with it. It was not technically rigorous enough for most BR shooters. Precision Shooting is where you'd want to look for good technical info that could be defended. Do you have any decent info on moly building up over time? Anything more current than 1999? |
| You don't have to believe me. "Google it" Been around thousands of avid varmint and bench shooters with hundred of thousands of rounds down the bore and rarly if ever see Moly used. No science or anything, think about it. Its on the bullet, it comes off in your grooves(it is a bullet after all), its a chemical that is designed to reduce friction... so if it doesn't cake on your bore then what does it do.......... If you know one thing about bench shooters when they find that barrel, they will never let it go, so they would use moly if it prolonged their barrel life(prolong fouling) without a downside. But their shooting for accuracy, which moly kills. Again, you don't have to believe me. Go to the range, varmint hunt, talk to any gunsmith with a bore scope. I don't have any visual evidence, I didn't want to buy another bore. |
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