Pressure issues, need some help

[dellet]

I will measure when I get back into the reloading room. The throat is past gone in this rifle. I know the 107 smk is seated maybe 2/3 into the neck and doesn’t touch the lands

And that raises another potential problem. If the throat is gone, extremely long jump, what can happen is a huge pressure spike. The bullet starts moving and the pressure behind it builds higher do to the time elapsed to the long jump, then hitting the lands acts like an obstruction and it spikes.

Back to what I said earlier, jump, jam, charge weight changing chamber volume is a balancing act. A bullet that leaves the neck before it hits the lands is a wild card. 296/H110 earned a nasty reputation for blowing up revolvers for this very reason.

Adding that you will want to know where touch is, not just that it is not touching. You need to know how much erosion there is.

 

[Doom]

And that raises another potential problem. If the throat is gone, extremely long jump, what can happen is a huge pressure spike. The bullet starts moving and the pressure behind it builds higher do to the time elapsed to the long jump, then hitting the lands acts like an obstruction and it spikes.

Back to what I said earlier, jump, jam, charge weight changing chamber volume is a balancing act. A bullet that leaves the neck before it hits the lands is a wild card. 296/H110 earned a nasty reputation for blowing up revolvers for this very reason.

Adding that you will want to know where touch is, not just that it is not touching. You need to know how much erosion there is.

Not sure what he means by the throat being gone but for the scenario you mention it would probably be extreme. I don't have personal experience with this but do know it has been hypothesized and it makes sense.

 

[DLT]

And that raises another potential problem. If the throat is gone, extremely long jump, what can happen is a huge pressure spike. The bullet starts moving and the pressure behind it builds higher do to the time elapsed to the long jump, then hitting the lands acts like an obstruction and it spikes.

Back to what I said earlier, jump, jam, charge weight changing chamber volume is a balancing act. A bullet that leaves the neck before it hits the lands is a wild card. 296/H110 earned a nasty reputation for blowing up revolvers for this very reason.

Adding that you will want to know where touch is, not just that it is not touching. You need to know how much erosion there is.

I can get that information. Just not around the bench right now, the bullet is not out of the case before it hits the lands