Originally Posted by winmag
What kind of 270, and load, gets 3650 fps with a 150gr?
A hot load for a 300WBY and 150's only gets you around 3500ish(+or-) and a 7mmWBY gets around 3300ish(+or-).
Did you neck down a 7mmRUM to 277? Confused......but very intrigued........
As a matter of fact it is a 270x300Rum, so yes it's a 7mm Rum necked down. I had it built after the 300rum came out but just before the 7mm was introduced.
With a 30" barrel and some H-50BMG I was able to push the 150grainers to over 3650fps, but decided that was far enough. With WC872 I was able to achieve right at 3900fps with 135gr Matchkings, but never really like using them because seating bullets out to the lands only left about .150" of bullet shank in the case neck.
I agree, it was very intriguing but not very practical. Barrel life was less than short. If I had it all to do over again I would have built a 338x300Rum or a 338 Tomahawk.