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Thanks Magnetite that makes sense. Out of interest what was the load of AR2209 powder used for the revised barrel length? I assume GRT will show this.
Regards Grandpamac.

So please explain how 2 inches of extra barrel drops the pressure by almost 5,000 PSI? It should be exactly the same.
Grandpamac.

This is what I have gone to recently after neck sizing for years. 0.002 inches allows for free chamberingand removes the possibility of any tight ones. This assumes you are using a competition shell...

Greetings @ Hunterdave,
The Hodgdon data loads have the 162 grain Hornady BTSP at 2.97 inches or 75.4mm which is longer than SAAMI max, Some years ago John Barsness came up with some rules including...

Greetings Hunterdave,
I think I may have an answer. AR2209 was sped up around 2,000 and the Hodgdon/ADI max of 53.5 grains of AR2209 with the 162grain has pressure in CUP which suggests it was for...