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27 RPM reloading dilemma

archeratlrg said:
Bushing dies are being made f


Bushing dies are being made for the 7mm RPM so you could pick up a set along with tge appropriate .277 bushing.
Click to expand...
So does this mean your building a
7mm/284 RPM. WOW
Weatherby needs to pay attention to some of the Threads that have been and are popping up.
25 RPM been done.
26 RPM Factory
27 RPM being considered.
28 RPM being built.
So that leaves 30
33 RPM Factory. 🎅
 
K.E.C. Darkside said:
So does this mean your building a
7mm/284 RPM. WOW
Weatherby needs to pay attention to some of the Threads that have been and are popping up.
25 RPM been done.
26 RPM Factory
27 RPM being considered.
28 RPM being built.
So that leaves 30
33 RPM Factory. 🎅
Click to expand...
I have a 35 RPM, A 8mm RPM, building a 30, and I have the 7 and 270 that I'm in the process of stocking.
 
Barrel twist will be 1:9 as I don't intend to do the long heavy's. I'm of the opinion that anything beyond 150gr and I go to my 7mm's. I did ask for extended throat on the reamer as Manson was suggesting a freebore of .090" which didn't appear nearly enough to accommodate the dummy I made up.
"Why go with a 6.5rpm necked up instead of a 338rpm necked down?" Always easier to neck up than down. I would never even try necking down that far.

Archeratlrg: Where are you seeing 7mmRPM bushing dies? Custom?
 
Last edited:
fmuguira said:
Dang it… that photo makes me drool for a long barreled 6mm RPM to replace my 6-280AI ….😳🤔
Click to expand...

I have a 6mm RPM. 27" Krieger 1:7, left hand Weatherby Mark V. It's quite a bit faster than my 6-270imp.(Catbird)

Tony
 

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My 6-280 AI easily outruns my 240 WB by 150-200 fps… guessing the RPM case might go an additional 75-100 fps over the 6-280; law of diminishing returns though as getting seriously over bore. The 6-280 AI likes R33, US869 with 110 s so guessing coal is about perfect for the 6 rpm!!

Mind sharing your powder/bullet/velocities with that 27" combo??
 
About 11% increase. Using the 1/4 rule then velocity gains would be approximately 3% … thus 100 +/- more fps all else equal….
 

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