I made my own bullets on CNC lathe because cost of shipping from USA is hight and Custom papers are worth ( need a licence just to make a shipping for a trial on 10 bullets !!!! ) so I make my own .
I use as tolerance ( for long range bullets ) on drive band diameter +/- 0.005 mm so a total tolerance of 0.01 mm that make a tolerance of 0.000393 inch ( if I am OK with conversion ).
I check my bullet diameter with a MAHR micrometer 0 to 25 mm with a precision of 0.001 mm and check the MAHR micrometer with a gage block grade 1 and the roudness of the bullet with a MAHR gauge ( capacitive gauge ) on a V block MAHR give reading in the 0.0005 mm .
this range of tolerance is quite easy to get on semi mass product parts and on bronze parts ( because bronze have more dilatation that steel I need to keep the bullets in controled temperature room before to check the diameter ( just a too long time contact with my hands warm the bullet and diameter reading increase ).
I agree with Catshooter that the tolerance give on the 408 website is a tolerance of laboratory and at this level even your breath make the reading change .
for my bullet I use bronze alloy without nickel , just regular bronze bearing , what is the improvement of nickel alloy use in LRB bullets . because if you use to hard or too tought alloy you smash the barrel grooves and nickel alloy fouling is worth to remove .
that just a question because share informations in the first way to progress
As far as i can tell the only real thing the 408 has going for it is long range competition. I would doubt the military would pick up such a new round with limited production, availability, extreme cost, and limited applications.
I personally like the idea of the 408, it uses less powder for long range as compared to the 50bmg, it has more precise brass and bullets. For long-range competition i think the round would do well. I just don't think it has a wide spread military application.
I personally would like to get a 408 as well as a 50BMG, but like the military I am a little leery about getting into an expensive rifle whose bullets come from a single manufacturer.
Sorry DANTEC you posted right before me, I was not commenting on your post. I imagine that the 408 would perform fine and I am not a machinist so I cannot comment on the bullet precision thing
I am just looking at it under the cost idea; the military already have the 50bmg in mass production. Wouldn’t it be simpler to produce some “select grade” 50bmg with some good solid bullet to utilize existing parts?
Does the 408 outperform a 50 with comparable bullets? If not why would the military change over?
As some may have read from my previous post, the 50BMG in the hands of some talented Cdn sniper has made a new world record for longest hit. This was over 2400meters (over 2600yds). Took two shots and that was that.
Guarantee you that his ammo was not machine gun fodder. Hopefully, we will get more info as this story gets declassified.
So the long range use of the 50BMG is still solid. However, it will be in specialized rifles shooting ammo to suit. This would not be much different then the 408 or any other design.
However, logistics do dictate that unless there is a wide scale change away from the 50 BMG, any other stand alone cartridge is going to have a very tough fight to be accepted. At the end of the day, when the team is ass deep in a fire fight in the middle of nowhere, having a ready supply of any suitable ammo is very comforting. At least in my opinion.
A 2500yd system is wonderful, but what happens when the fight gets 500yds away and you are out of ammo and nothing else fits?
With globalization affecting the armies of the "western" world, not only would any new cartridge have to be accepted by the US, it would also have to work for other NATO and affiliated countries.
Don't think there are that many armies looking to reinvent the wheel. How much is the 338 lapua used in real combat today, by how many countries? Compare that to the 308, 300win mag.
I belive that any new long range sniper/machine gun cartridge would have to revolutionize the performance of what we have today. Sort of like the change from black powder to smokeless. We just have too much invested in known tech that still works to look at reinventing the wheel.
I am guessing smart 'munitions are going to get further R&D money. Wouldn't a fire and forget bullet be kind of neat?
I said .00005 or one/50 millionth. I did not invent that terminology. It was first used by Mitutoyo in describing their instruments. Whether you want to agree with that is up to you, but the .00005 is accurate.
Please note the tactics of Catshooter, AKA Paul Coburn. He makes a number of erroneous charges. When they are proven to be invalid he finds part of one of the pieces of information that is confusing to attack. By attacking this one piece of information he then expands that the author is shameless and worthless and all his resulting work is of no value.
He has completely ignored the fact that he was blatantly wrong about the bullet's composition. He was blatantly wrong about the expense of the ammunition.
Mr Coburn is not a professional nor is he a gentleman. He is not interested in a discussion. He seems only to be interested in personal attacks and making himself look good at the expense of someone else. Those of you who read a number of forums recognize the tactics and recognize that Mr. Coburn uses these tactics many times over.
Mr. Coburn comments are, more than anything else, a waste of my time and a clear reason why these forums eventually become tiresome.
If I am off-base, let me know, in a private E-mail.
I wait from a proposal from LRB to be able to test and make trials on 408 Cheyenne .
As I say in my posts I am as Saint THOMAS I trust in what I see so just need some help and share from LRB to organise a trial in Europe .
I can get a barrel from BORDER BARREL and one from PAC NOR .
Die can be ''home made'' even neck sizer with bushing .
I need cases ( made in Germany so no problem for import export ) , bullets or bullets drawing if Custom licence make problem and reamer drawing to order one with some loading tables I think I can shoot soon at ultra long range ( 1000 meters / 2000 meters and 3200 meters if needed ) .