6.5 RPM Boon or Bust?

MILEPOST

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I heard that Weatherby is coming out with a new cartridge in Sept. It's called the 6.5 RPM. No one is exactly sure of the exact case dimensions as of yet, but it appears to be possibly a stretched 6.5- 284 Norma. The rebated case has a conventional shoulder of around 35 degrees, no belt and a length somewhere around 2.5-2.6 inches. Doing the math the case capacity should be around 82 grains which is the same as a 264 WM.

What I find interesting about the design is that it will work on a standard long action. So if you have an old shot out 270W, 280 Rem or 30/25-06 rifle you could rebarrel it, have magnum performance and be able to use the great selection of new 6.5mm bullets. It should also work well with the slower powders like VV570 and Reloader 33.

IMO - I think this might just make for an awesome light weight goat/sheep rifle.

What do you all think??

 

HARPERC

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Devil's in the details, at worst it works as well as others in that class of cartridge, and merely adds to the clutter.

At best if they build the rifle with enough twist to handle all the bullets out there, and contract for good brass it could be interesting to me.
 

MudRunner2005

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Sounds like more marketing BS, reinventing wheels that have long-been invented, under fancy new names, claiming "groundbreaking" advances... :rolleyes:

Should go over about as well as the 6.5-300 Wby... So... DOA is my guess.
 

B23

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Overbore cartridges are cool and everyone loves speed, I know I do, but they generally need a fair bit more barrel length before they can really start showing their horsepower advantage. Nothing against cartridges like the 26 Nosler or 6.5-300 Wby but IMO they aren't all that impressive until you get at least a 28 inch, or longer, tube on them.

In a 24 - 26 inch barrel shooting the 156's a 6.5-284, at equal pressures, is going to shoot about 70-100fps slower than the much bigger case capacity cartridges and do so with 15-20 grains less powder.

Personally, I think the new 6.5 PRC, 6.5 SAUM, or even 6.5-284 when put in 24 - 26 inch barreled rifle is a much better combo, but if you want a hot rod 6.5 and you don't mind the longer lenght barrels, the big 6.5's could be the better choice.
 

MudRunner2005

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It sounds like a good option if you do have a standard bolt faced long action laying around. Choices are nice, but we do have a lot of choices already.

Jeff
Agreed. I think that at this point, a lot of stuff is getting redundant.

I think we've reached a point where it's going to take something truly groundbreaking to bust the mold and get the ball rolling into true advancements. Things are getting stagnant from ballistic recycling in different cartridges... Basically, you have 10 (just using a generic number) options that all do the exact same thing, but a couple have belts, a couple are LA, a couple are SA, a couple are magnums, etc... Same results, different cartridge. We need some true innovative and creative outside the box thinking to break this current cartridge slump that everyone is in.

Just my personal opinion.
 
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MILEPOST

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Well, I just received the specs on the new 6.5 RPM and it is definitely based off the 284 cartridge.

SPECS: Chamber Print

35 degree shoulder
OAL 2.58"
Length to shoulder 2.155"
Base diameter .501"
Shoulder diameter .475"
Neck length .298"

No SAAMI info yet, but I believe it has a standard throat set at .80"-.85", which is optimal for the 140gr. class bullets loaded into a standard 300 win mag box.


A match version reamer is available from PTG and the throat is set at a 156 gr. Berger friendly length of .188". ( same as a 6.5 PRC )

It should end up with a case capacity of around 82-83gr. That is almost the same as the 264 Win mag and has about 20% more powder capacity over the 6.5-284.

I'm thinking that given some good brass and loaded with VV570 it would have the potential of pushing a 156 pill at 3150-3200fps. IMO...This will make for a damn nice sheep/goat rifle.

Sure is a lot of old 30-06 thru 25-06 rifles gathering dust in safes out there. Plenty of really nice used ones in gun shops and pawn shops too! Nice option for someone looking to economically build a mild custom using grandpa's old rifle that was passed down.
 
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Greg Duley

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I think its might work out to be a very good 6.5 for 1" tenon standard length actions like the T3 etc.
And if Weatherby make a nice job (as in true) of the 6 lug Ti action, their barrel quality is better than it has been, and their new CF stock is actually a laid up/not chopped strand style, it could be a ripper off the shelf mountain rifle/caliber combination. The brass should be Norma so very accurate if not the hardest in the head area. But will easily handle 63,000psi all day long which is all I'd be pushing something like this at anyway.

 

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