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Re: disintegrating bullets
Posted: Mon Aug 20, 2012 8:46 am
by John25
ovenpaa wrote:Bryan Litz - Applied Ballistics For Long Range Shooting would be a good one to start with. Look for a used copy of the first edition as opposed to a new copy of the latest edition and you should save yourself about GBP35
I'm with the 'brain hurts' group.
Another book? I'm struggling with Rinkers 'Understanding Firearm Ballistics'. As sums was a hated subject and I never was any good, some of the formuae are quite daunting. Even using his 'skip this' approach, sometimes it is hard work but interesting none the less.
Keep at it Dougan. I can't promise that it will make you shoot any better but it will help you to understand why you do (or don't)
Re: disintegrating bullets
Posted: Mon Aug 20, 2012 10:04 am
by The Cupcake Kid
Dougan wrote:
What are the actual reasons for a bullet to break up, and is it mainly lighter bullets...or can this happen with 140-200 gn bullets?
One of the common reasons is barrel wear/damage. When the barrel gets to the end of its life, small chunks of rifling can break off and this will damage the jacket of the bullet as it makes its way down the barrel. We're talking tiny bits of metal here and you'd need a borescope to see if it's happened.
This can often be the reason why a barrel will seem to suddenly lose accuracy from one round to the next.
Re: disintegrating bullets
Posted: Mon Aug 20, 2012 6:32 pm
by Dougan
ovenpaa wrote:Bryan Litz - Applied Ballistics For Long Range Shooting would be a good one to start with. Look for a used copy of the first edition as opposed to a new copy of the latest edition and you should save yourself about GBP35
I'll add this to the growing list of loading/shooting related books I'm trying to buy second hand... sign92
Re: disintegrating bullets
Posted: Mon Aug 20, 2012 7:06 pm
by John25
Have a trawl of 'tweb for a free pdf.
I have a Hatcher's which I 'found' (after buying one!)
Re: disintegrating bullets
Posted: Tue Aug 21, 2012 6:26 pm
by Dougan
The Cupcake Kid wrote:Dougan wrote:
What are the actual reasons for a bullet to break up, and is it mainly lighter bullets...or can this happen with 140-200 gn bullets?
One of the common reasons is barrel wear/damage.
Thanks Cupcake, but that's not going to be the reason in Christel's rifle - Now I'm starting to get my head round the physics, I can see how it would be harder to get that kind of RMP from a larger heavier bullet anyway...but then a heavier bullet with a larger diameter would generate more centrifugal forces at the edge (?)...this is why I need a book...as I'm sure there's a lot more to it than the RPM equation...
Re: disintegrating bullets
Posted: Tue Aug 21, 2012 7:36 pm
by John25
All you need to do is to persuade someone to do with solid ( brass/bronze) bullets, the level of ricochet testing which has been done over the years with 'normal' ones; get the Defence Lands and NRA Johnnies (after you demolish half of Camberley and surrounding areas) to accept their use, and Robert's yer rellie!
Re: disintegrating bullets
Posted: Tue Aug 21, 2012 7:55 pm
by Dougan
John25 wrote:All you need to do is to persuade someone to do with solid ( brass/bronze) bullets, the level of ricochet testing which has been done over the years with 'normal' ones; get the Defence Lands and NRA Johnnies (after you demolish half of Camberley and surrounding areas) to accept their use, and Robert's yer rellie!
Yes the composition of the bullet is yet another factor...all very interesting...and I'm starting to understand why people try so many variables.
Btw: Thanks for the 'PDF' tip (I thought I'd replied...)