30br, moly and barrel life.

C

captbill

Guest
I was surprised at the number of people shooting moly coated bullets from a 30br.I know this is another contraversion one but here goes.
I shot moly coated bullets in other disciplines but stopped because of early throat erosion, this was a decade ago. I was wondering what barrel life you guys are getting with moly in the 30br?
 
Dont think its moly.Think its danzac,but not sure.I was thinking it was moly to but found out other wise.
 
moly on 30br

No this was moly for sure. I spoke with a couple of guys.
 
We didn't like the moly cleaning stories here... So we went for the Danzac at first, then we got some WS2 (same stuff) from Rose mill. Then the next trip was with BN HCPL Grade... They all worked great, BN did the best for us and I imagine we'll stay with it for a while. It also is the least hazardous of the three. In fact the BN is used in cosmetics.

Paul
 
sorry....where did you find facts supporting throat errosion DUE to moly ?

throat errosion is mainly powder burn/temp....nothing to do with moly.

yes i'm a confirmed moly user....every rifle but one get moly.

mike in co
 
30br and moly

I had barrels eroded badly shooting .243. We did it before the heavy weight high bc bullets came out shooting NRA Highpower. You could literally measure the erosion between Matches or practices just by seating depth. They would have to be setback every 1,000 rounds. I went through 3 barrels in 1 summer. But man did they shoot.
 
2nd half

Sorry some how I sent the first one incomplete. Yes actually it was the heat from those hot loads that did it. But you must push moly rounds a littel hotter to get the same velocities.

Barrel life in 30br with moly is realy all I wanted though.
 
moly

Mike I think the score match at fairfax a few weeks ago "actually" was benchrest.
 
I get a lot of mileage out of my .30 BR Barrels. I use the .30 BR for IBS Score (that's real Benchrest) from May to October I compete in usualy 2 yardages per weekend and about 2 to 3 weekends per month. I practice a little at home between those weekends depending on work, and through the winter I work on making sure all the bugs are out of our equipment, shooting a few times a month to test things out. I use a tuner which can cause you to use more ammo. I don't count the rounds that go through my .30 BR barrels, but I count the years that they last I currently am using a barrel that has three seasons on it. I have other barrels for .30 BR that I haven't even fired yet, and I have some that I took off that arent shot out yet to try this one... I guess you could say that by using WS2 or BN we have extended the usable life our barrels.

Dad uses his barrels more than me, He's retired. He not only shoots IBS score but he has more time to practice and he shoots the Postal series Score matches and does quite well. His barrels seem to last a lot of rounds too.

Paul
 
captbill said:
Sorry some how I sent the first one incomplete. Yes actually it was the heat from those hot loads that did it. But you must push moly rounds a littel hotter to get the same velocities.

Barrel life in 30br with moly is realy all I wanted though.
Click to expand...

not true.
you need more powder to get the same velocity, but not more pressure.
the increase in powder is to overcome the larger combustion chamber/time event.
since a moly bullet has less friction, it moves easier. on intial ignition this slight movement means more combustion volume behind the bullet than with a naked bullet. this larger volume means unaltered loads have lower velocity than the naked load...but they also have less pressure. your load increase with moly should only taken you back to your original velocity and PRESSURE.
moly was not the cause of your throat were....shooting a hot 243 was.

dont blame moly for your load choice.

mike in co
 
captbill,

I bought a used Benchrest rifle chambered in a 30BR last winter. It had roughly 5,000 rounds through it. Through load development, practice, and tournaments I put, right at, 1,000 rounds through it. I now have a new barrel on this rig - but the old barrel was still shooting good. So to answer your question, this barrel got 6000 plus more. The bullets were all coated with Danzac = WS2 = Tungsten Disulfide

Stanley
 
so his question was about bbl life in 30br...but slammed moly in the process with a poor reference to an issue with short bbl life in a hot 243 load......well to answer your question...go look on 6mmbr,,,they have a great article on bbl life in the opening story on 30 br......something over 6-7000 rounds and still competitive.

mike in co
 
francis...who you talking to ?

if me, i shoot a 308win br, i gave up on my 6ppc and will go with a 6 beggs....and of course there is the 223...but all moly and all local club br.

have a reciever now for my 30br..but it is a ways down the road still.

go read what randy and the boys have to say about the early life of 30br on the 6mm br site.

mike in co
 
Hey Mike, )chill(

We don't have to read what Randy or Joe or Al or Henry has to say about the .30BR or The Bullets and coatings used, we talk to them at the matches where we compete with them.

I think if someone were asking about the uses and attributes of moly in a .30 BR, they not only would want to know the good points but also the bad points... We have seen both and have also found that there are better alternatives like WS2 and BN (HCPL) Grade. There are better choices than moly, and many BR shooters that use coated bullets or coat their own have switched away from moly. Anyone considering moly should want to know those facts.

Paul
 
For what it's worth, when I was going to start shooting Moly bullets in my 30BR and 6PPC years ago in AZ, I was advised by someone whose opinion I respected and still do, to use a good moly paste in the barrel. The idea was that you could control the amount of moly actually being applied and keep it away from the throat, which resulted in velocity going up for the same powder charge as friction in the barrel was slightly reduced and fouling was reduced. Of course I was told to make absolutely sure the barrel was clean before applying. I did all that and it worked for me, as far as the chronograph was concerned. It did not improve my scores any, but that might have been because of pilot error, well probably was.


Anyway, when I moved to the land of the permanently wet and humid, in the rainforests of SW WA state, people here were horrified to find out I was using Moly....... I heard more tales of woe and throat erosion than I ever had before or since. I did not know what to think until a local gunsmith with a Hawkeye bore scope showed me a barrel that had allegedly been ruined by moly-- I saw it--it had certainly been ruined by something. I stopped using moly since it has not made any difference one way or another in scores for me and not using it is one less thing to do for loading or gun care. I don't know anyone here that is currently using moly.
 
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