2 piper
Thanks again for your reply.
I know that Burrard knew what he was talking about. However have a look at the following:
You will have to open it with Adobe reader.
Rottweil Tiger Shotshell Data If you scroll down to page two you will see that it states:
"The Rottweil Tiger is a very versatile usable shotshell. With a case length of 67.5 mm, it is designed for shotguns with the formerly common chamber length of 65.0 mm on the one hand and works very reliably in the critical semi-automatic shotguns on the other hand."
Since it is safe to use in a 65mm = 2 1/2 inch chamber and being a modern CIP shotshell it has a service pressure of 740 bar = 10730 PSI. From this I presume it is usable in the old 2 1/2 inch chambered 3 tons per sq. inch guns, particularly as the blurb refers to "formerly common" chamber lengths, and especially as these guns are very much in use today with British CIP shells of the same pressure standards in the UK.
From this I infer that the if 10730 PSI is safe to use in a 2 1/2 inch chambered 3 tons per square inch service pressure proofed gun then the safe usable pressure (service pressure) in a heavier proofed 3 inch chambered 3 1/2 tons per sq. inch service pressure gun must be substantially higher than 10730 PSI. 3 1/2 tons is 16.67% higher than 3 tons (to state the obvious). Thus I infer that 3 1/2 tons service pressure is higher than 11500 PSI (10730 PSI + 16.67 % of 10730 PSI = 12518.69 PSI)
Surely if CIP proof 2 1/2 inch cartridges aren't meant for the4 older extant 3 tonners then they would say sop on the box. they say the opposite. What say you?
L Brown
I posted the above without reading your post which probably crossed mine.
I agree that 3 1/4 tons is not enough for magnum proof (especially CIP magnum proof at 1370 bar with service pressures of 1050 bar) but it is near 11500. PSI. So 3 1/2 tons must be higher and therefore guns so marked, in proof, with 3 inch chambers should be all right with SAAMI 3 inch cartridges.
All the best
Skeeterbd
