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Buddy of mine has or had a Remington M700 factory chambered in .300 WTBY mag. He told me it put 200gr. Noslers out using Speer data for IMR7828, at just over 3,200fps. I said B-ll-Sh--, in my usually soft manner.
Well, I did get to chronograph it, little finger bolt lift and 3,230fps or so - 200gr. Nosler Partition. It was almost 200fps faster than the book. Who'd have thought?
The data was out of #8 or #9 Speer Manual I think & that load or data in not in the current books.

If I remember correctly, it was 82.0gr. IMR7828 with Fed. 215 primer.

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HA...usually soft manner??

For years out of my RUM I was shooting 180 A-Frames at 3370fps... now using 200gr A-Frames around 3175..no big signs of pressure..so, I would believe that..

Do you know if the barrel was set up with the customary "weatherby freebore"??

I know Rem for years was showing the 180 Rem Factory loads at around 3200fps..which was way under what it is capable of ..while testing on my chrono I hit the 3400fps mark with the 180's.. definite pressure signs however..