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Re: Bullet Coating
Posted: Mon Dec 27, 2010 1:56 am
by woody_rod
The Gun Pimp wrote:Woody,
I've certainly proved to my own satisfaction that moly coated bullets reduce velocity - which is another way of saying 'reduce pressure'.
It's easy enough to test this with a chrono.
Cheers
Vince
Ok, I can test this as well. All of the aspects of the bullet inside the barrel can be explained by principles of physics. Using what I know about physics, chemistry and constants, the idea of "lower MV = lower pressure" just does not add up. Is there any proof of this? Like I said (and no offence) opinion is not fact.
I could probably prove the opposite if I thought coating bullets was a worthwhile subject, which I don't.
Re: Bullet Coating
Posted: Mon Dec 27, 2010 10:23 am
by ovenpaa
Moly is a lubricant so it it a case of reduced friction in the bore which results in reduced pressure, and reduced MV?
Re: Bullet Coating
Posted: Fri Dec 31, 2010 4:17 pm
by FilippoMo
While visiting the US I met the past editor of VHP ,the magazine of the FCSA (Fifty Caliber Shooter Association).He had pressure measuring apparatus and reported about 5000 p.s.i. difference
between coated and bare bullets.He used moly only and coated solid bullets.At this time I use
HBN and I quite like it.The fact that some of the best shot do not use it and win is not
a scientific proof either:they are just too good at what they do that they win anyway.
Some bench rest super shoots have been won with coated bullets.
You must be careful about not overdo your cleaning when using coated bullets.I just pass a few
patches of my cleaning solution and be done with this chore.My sequence is KG 1 a few patches,then
KG 12 and that is usually all that is needed.You must sometimes switch to a faster powder to
get best results,so experimenting is in order,if you do not like this then coating is not for you.
best wishes.
Filippo
Re: Bullet Coating
Posted: Fri Dec 31, 2010 4:31 pm
by Christel
That is exactly the cleaning routine I have as well. Just a few patches down the barrel and yes I do have an endoscope and my barrel looks very nice inside.
I use methylated spirits and gun oil for everyday clean. Ovenpaa thorough cleans it sometimes with something, not sure what or why...LOL
Welcome to the forum FilippoMo.
Re: Bullet Coating
Posted: Fri Dec 31, 2010 4:35 pm
by ovenpaa
Hi Filippo, good to see you found your way to the forum. The 'sometimes and something' Christel refers to is a complete copper strip every 150-200 rounds starting with bore foam followed by a couple of other cleaners until completely cleared, I use an bore scope to check.
How are you getting on with the DAG cases?
David B.
Re: Bullet Coating
Posted: Fri Dec 31, 2010 5:06 pm
by FilippoMo
ovenpaa wrote:Hi Filippo, good to see you found your way to the forum. The 'sometimes and something' Christel refers to is a complete copper strip every 150-200 rounds starting with bore foam followed by a couple of other cleaners until completely cleared, I use an bore scope to check.
If you do not do so accuracy is affected?
How are you getting on with the DAG cases?
I did quite a lot of work some cases are excellent,better than Lapua from dimensional stanpoint,
however we got the best results with the new Lapua Palma with small rifle primers.When I say we it
is me doing all the loadings and my son the shooting.The best group he got was with the small primed cases.This was against my thought but we will follow this up as soon the ranges will open
again next year.It seems that we are going to get some long range facility so we might see what happens to long range.
sincerely
Filippo
David B.
Re: Bullet Coating
Posted: Tue Feb 01, 2011 7:17 pm
by ronboy
Most of the discussion is about moly coating, just to say I shoot mostly Marlin underlevers using hard lead boolits. These have a grease groove around them but I put about 300 in a strong plastic bag, then squirt a small amount of alox in and hold the bag closed with one hand, while rolling the bag with the other hand. When I tip them into a box they are wet and in a few days they are greased and firm with a fine film coating. I have shot around 30K like this with no leading and most times I do not bother to clean the rifle bore for weeks and it still hits the button. Ronboy