VIT 140

[Mauserbill]

Hello
I had my first outing with my new vitavouri 140 powder this weekend and loaded to the Vit reloading manual, I found the loadings in my military calibres somewhat fierce, is this powder acceptable for a 10% download from the book figures.

[dromia]

So long as you don't go below a 60% case fill then it should be OK from a combustion point of view.

[billgatese30]

As in 10% down from the max load, or the min published load? Going down on the minimum published load isn't normally recommended as it can cause peculiar pressure spikes in some powders.

[JohanM]

Need more info to give advice. What rifle/calibre, bullet weights and what do you mean by fierce? I have rifles that I load at minimum load but still lick a bit if I do not have good form and because the rifle is light where as I have rifles that Load past max and still feel very easy to shoot because it is heave and long barrel.

[shotgun sam]

So long as you don't go below a 60% case fill then it should be OK from a combustion point of view.

Hi Dromia,
Can you explain why you don’t go below 60% case fill? I have always worked on the principal of if in doubt ask especially where firearms are involved.
Cheers
Sam

[dromia]

Slower a powders burning rate the more difficult it is to ignite.

Faster powders ignite easily, all pistol powders and fast rifle powders up to say N120. So fill density is not an issue but once you get into medium rifle and slower powders then the fill density needs to be sufficient to allow the ignition flash to move through the powder and not over it so as to ensure an immediate burn.

Less than 60% fill with these powders can lead to an incomplete or even worse a delayed burn which causes a catastrophic SEE.

[shotgun sam]

Slower a powders burning rate the more difficult it is to ignite.

Faster powders ignite easily, all pistol powders and fast rifle powders up to say N120. So fill density is not an issue but once you get into medium rifle and slower powders then the fill density needs to be sufficient to allow the ignition flash to move through the powder and not over it so as to ensure an immediate burn.

Less than 60% fill with these powders can lead to an incomplete or even worse a delayed burn which causes a catastrophic SEE.

Dromia,
Thanks for explaining that.
Sam

[DammitMissedAgain]

or even worse a delayed burn which causes a catastrophic SEE.

SEE?

[dromia]

Secondary Explosion Effect

[DammitMissedAgain]

That looks like an intriguing can of worms! Off for a read...!