Greetings @Steverusty,
The Hodgdon/ ADI data is held to a lower pressure due to perceived weaknesses in the M96 action, mostly the lack of a third safety lug. Whether this is justified is open to discussion. AR2208 is a non temp sensitive powder so it may not have been the hot ammo that gave the hard bolt lift. In any case it is not a good idea to leave ammo lying in the sun at any time. The Hodgdon/ ADI data is held down to around 45,000 CUP and it would be wise to stick to that in a 120 plus year old rifle. 30 years ago I fired some pretty hot loads in my M38 6.5, about 2 grains over max with current data. Would I do it today? No. 2 more grains will give you around 100 fps additional velocity. AR2209 has become faster than it was 30 years ago but I have not heard of any change with AR2208.
Regards Grandpamac.
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