i have never shot or loaded bullets that were
moly coated.a few years ago i bought a new tumbler
from cabelas and a moly kit came with it.Last
night i coated some of my bullets and loaded them
in groups of three to find the most accurate load,
Do i need a bore prep or not and will i lose velocity due to the moly.
thanks reloader len

[ 12-04-2002, 04:28: Message edited by: reloader len ]

I don't feel you "need" a "moly prep" for the bore; I think they're just a way for people to make money.

Yes, you'll lose velocity over the same load without moly-coated bullets, but you can up the charge by, typically, two percent to compensate for the loss and without worrying about exceeding pressure restrictions.

As always, if you blow yourself up with any information I gave you, above, I've never heard of you.

Russ

[ 12-04-2002, 05:55: Message edited by: Russell E. Taylor ]

Well...the whole point of molycoating is to reduce friction and eliminate fouling. This is only accomplished if there is a coat of moly covering the entire barrel surface BEFORE the first bullet goes down the tube. You can't accomplish this by simply firing moly coated bullets because the first couple of bullets will lose their coating early in the bore and deposit copper later down the bore. Subsequent firings will leave a layer of moly further down the barrel but also serve to coat over the copper fouling left from earlier firings.
The best article I've read on moly can be found at: http://www.jarheadtop.com/books.shtml scroll to the book titled "Care Cleaning and Sportsmanship" and click on sample chapter 4. It explains all about conditioning your bore. BTW, stay away from all Moly except Laboratory Grade moly... Contrary to some of the posts on this board lab grade moly IS NOT hygroscopic nor does it contain anything that would create acid or corrosive effects on a bore. Again, read the article and stay away from automotive lubes with moly or any other moly based product unless you have a MSDS that fully outlines its contents...

I Would use a Moly Bore Prep before shooting Moly coated Bullets.
You May or May Not Have a Velocity fall off so watch the Loads.I have had some loads that did drop off and others that increased with Moly Coated Bullets.

After dozens of rifles, I finnally got a 1" group [I have now shot a few .6" 5 shot groups at 100m].
I am using Lyman moly bore paste.
I don't know if that is the reason for my sucess or not.
Life is just too short for the individual to sort out all the accuracy varibles with experiments.

[ 12-05-2002, 20:01: Message edited by: Clark ]

Do yourself a favor and forget about using moly coated bullets. You will just end up frustrated and probably with a rusty bore. Moly draws moisture into the bore and it will rust unless you run an oil soaked patch through the bore after every use. The intened purpose of moly is extened bore life and acheiving higher velocites through less friction between bullet and bore. I find moly to be another problem to deal with in my quest for accuracy and would never use the stuff. Most moly users must find out on their own it is waist of time and energy using that black rust producing compund.