Just wondering about stuff

[skeet]

The old screw machine partitions have a relief cut in the middle of the bullet.You can't miss it. I will try to take a picture and post it. I buy them all the time in small lots in most calibers. They did that to reduce pressures as the partition was a hard bullet and raised pressures pretty badly....esp with the powders available at the time they came out. We don't know how lucky we are nowdays..even with the powders hard to find. Barnes is doing it with the X bullets now. That bullet really raised pressures so they started putting grooves round the bullet. I had some of the older 130 gr X bullets for the 30 cal I could get 3000 ft per second in the 300 Savage. I can get a little better velocities with the new bullets at safer pressures.

[skeet]

I guess I should make it clear that the relief cuts on the bullets just reduced bearing surface in the barrel. less bearing surface in the bore equates to lower pressure I have been told that some of the A frame bullets have been looked at as having too much bearing surface too. Remains to be seen if they are going to use the usual route to reduce pressures. Looking at some of their loading data ...wow.

[Jack]

The relief cut is really obvious on the old Partitions, you won't mistake it for anything else. The old Partitions also did have very light machine marks on the exterior. You might not notice the machine marks unless you are looking for them, but on close examination, it's obvious they were made on a screw machine, if you are familiar with screw machine work.

[Rapier]

Ok, I will take a look at my partition bullets tonight. I have never opened the boxes.
Ed