Recent content by borbal

How important is the difference in design of the bullet to the final maximum pressure and muzzle velocity? It is a big enough deal that I have identified four different bullet types which will behave significantly differently in terms of shot start pressure and bullet friction and which...

One of the approximations in GRT/QL is that they do not have bullet friction as a separate variable. Instead, they increase the projectile mass by about 4% to mimic the effect of bullet friction. However, this friction loss then goes as the square of the velocity, whereas it should be...

That is not what it is supposed to do and (I just tried it) that is not what happens. You can make as small a change as you like and it will respond accordingly No.... results (for velocity anyway) are usually pretty close to GRT. I have to admit, I don't have an up-to-date version of...

Well, now there is YET ANOTHER German internal ballistics app. Not that I have anything against Germany or Germans, but they seem to be the only people (apart from me - but then I do have a German name) who are interested in creating and providing internal ballistics software for the unwashed...

I think the actual statement indicated we should not expect GRT-NG until 2028 at the earliest...

True. Once you are supersonic (rather than trans-sonic) drag decreases with velocity. But when you are subsonic, drag increases as velocity squared. It turns out that about 900 ft/sec is best. Look around for some good pistol ammo.

Standard factory is 1:10. This is very marginal when shooting 100 grain bullets, which will stabilise in some guns but not in others. The rate of twist for the 6mm Remington was 1:9 which solved this problem for 100 grain bullets. But the 243 Win is what is most popular. So, not the bullet, but...

What is the rate of twist in your 243?

Congratulations on negotiating that without mishap.

Check this out. Page 48 https://deepblue.lib.umich.edu/handle/2027.42/3866

You will find that in necking the case down, the neck gets thicker and you may need to turn the neck to allow the case to chamber.

Was that aimed at me...?

In this case, I am sure, the estate was paying!

Well, you need a muzzle brake of some sort or the gun will tear your shoulder off! There was a very large can on the front as I recall which also acted as a sound moderator.

Loading data for the 7mm Rem Mag is plentiful and it has almost exactly the same case capacity.