Thoughts: 6.5 RPM, 270 Win, or 280AI for re-barrel?

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David Hoback said:
Not a fan of rebated rims. They are just… WEIRD! The 280AI is nice. My choice would be a 6.5-284 in a long action. Can throat it & run run the very heaviest 150gr+, with OVER .700 BC now, and will easily reach out past a mile. But that’s me.

What is your plan with this? It’s main purpose. I’m a for fun target shooter, hence why I would go 6.5-284. I like to have the ability for mile performance, but I’m not worrying about it taking game at extreme distance, & I can do without any extra recoil, powder usage, etc.

Another I’d choose over the RPM is the
6.5-06AI. My good friend in Arizona had his Winchester 70 rebuilt into an 6.5-06AI. He actually doesn’t shoot it much because he got bored of it. He enjoys working up loads for his rifles. He loaded the first rounds for it & it cloverleafed.. FIRST time out. Tried other bullets, other powders. Every group a cloverleaf! No fun for him, LOL. But.. he’s a strange bird anyway:rofl: Most would love that performance.

So, what is your intention with this one?
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Still just intended as a hunting round. I’ve pondered the 6.5 Gibbs, basically a 6.5-06, and I have plenty of 270 brass to neck down. Just not sure I get anything over a faster twisted (1x8) 270 spitting out 150gr ABLR ?
 
Random 8 said:
I'm a practical kind of guy. You're already deeply invested in .270. You have a great deal of experience with the round. It works for you, and you have only a new interest in stretching it's legs. Get the .270 barrel with a faster twist. It should still do well with 140 cup and cores for shorter range deer work. I'd actually download it a few grains as I do with my .280 Rem as I prefer eating venison to spreading it about the woods. You'll get the most out of some of the more exotic heavy bullet offerings as well. Brass will be abundant for the forseeable future. You'd be all set.

The .280 AI has some cool factor, but with heavies I'm not sure you'd be gaining much over the parent round .280 Rem. If larger Western game is in your menu, it does up the ante just a bit, getting closer to the vaunted 7RM in terms of raw kinetic energy downrange. That said, I don't think a critter will know the difference when you smack him with a 175 partition. The 28s do gain a bit in terms of bullet mass and selection for what it's worth.
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Couldn’t agree with you more. The reason I posed the question in the first place was to solicit some alternative options and maybe a solid argument to try something *other* than a 270. Bottom line, the 270 just works. It’s served me very well over the last twenty years or so, and were I to go to Alaska I’d probably just load a good 150 at 2900fps and be content.
 
Anchorite said:
PRC is a magnum bolt face too, and the 270 recoil is just so nice. I’m not interested (as I age) in thumping myself more than what I get with the current platform.
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my 6.5 prc kicks less then my last two 270s they hold about the same about of powder, very close Actually. And if shooting the same weight bullet there similar, pressure is the same to. But you want a 3006 rim size.
 
270 Winchester 150 gr. Accubond
.500 BC
Max published velocity 2918.
24" barrel.
Drop at 500 yds: 32.9
Velocity at 500 yds: 2165
Energy at 500 yds: 1561

280 Ackly Improved 150 gr. Accubond
.493 BC
Max Published Velocity 26" Barrel: 3107
Drop at 500 yds: 28.7
Velocity at 500 yds: 2313
Energy at 500 yds: 1782

6.5 Weatherby RPM 140 gr. Accubond
.509 BC
Max Published Velocity : 3075, barrel?
Drop at 500 yds: 29.1
Velocity at 500 yds: 2309
Energy at 500 yds: 1658
 
Anchorite said:
Couldn’t agree with you more. The reason I posed the question in the first place was to solicit some alternative options and maybe a solid argument to try something *other* than a 270. Bottom line, the 270 just works. It’s served me very well over the last twenty years or so, and were I to go to Alaska I’d probably just load a good 150 at 2900fps and be content.
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IMHO I'd question if any small gain would be worth the investment of new dies.
With a 8 or 8.5 twist you could run the 165gr ABLR in 270 and be GTG in North America.
 
Anchorite said:
solid argument to try something *other* than a 270
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In my opinion, we're really splitting hairs, especially talking about hunting cartridges. As such, really the only reason to try something different is because you want to..... And that's also the best reason I can think of considering the cartridge similarities.

If you actually NEED something different, you either need to be looking farther up or down in caliber and/or capacity.
 
mavracer said:
IMHO I'd question if any small gain would be worth the investment of new dies.
With a 8 or 8.5 twist you could run the 165gr ABLR in 270 and be GTG in North America.
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Yep. I am leaning heavily in this direction. Plus I am already set up with dies, brass, etc. As compelling as a 280AI may look on paper, I suspect real-world differences are negligible. I’m not discounting the 280AI, just my observation that much may be in the eye of the beholder.
 
LoonWulf said:
In my opinion, we're really splitting hairs, especially talking about hunting cartridges. As such, really the only reason to try something different is because you want to..... And that's also the best reason I can think of considering the cartridge similarities.

If you actually NEED something different, you either need to be looking farther up or down in caliber and/or capacity.
Click to expand...

Point well taken and couldn’t agree more with you (and the other loonies on THR!)
 
If you have the brass, dies, shell holders, etc, stay with the 270 Win. Going to a faster twist does not mean all your old 130's and 150's have to go in the trash can. I would be curious to know just what velocities can be achieved with the heavier bullets, given that manufacturer data is grossly optimistic. A poster here copied data that 150's can be pushed to 2900 fps in a 270 Win. In my recently rebarreled pre 64 M70, with a barrel length of 24 inches, I can't push 150 grain bullets near 2800 fps or I get blown primers. My barrel is tight, and so is the chamber. I don't think I every pushed a 150 at 2900 in my FN Deluxe, and that barrel has a lot of free bore.

I would stick with cases that are similar to the 270 Win, as going to shorter, or fatter, or cases with different shoulder angles can result in feed issues. My pre 64 M70 NM fed like a champ with 30-06 rounds. When I burned that barrel out, I decided to go 308 Win, and it would not reliably feed 308 cartridges until I purchased the short action parts, such as extended bolt stop and the short magazine conversion. Lucky me those were available. Have not seen those parts in a while.

Of course, if you are really enamored with heavier bullets, I have heard of this new, revolutionary cartridge, based on the 270 Win case, that will use bullets heavier than 170's. I think it is called the thirty 06. :D From the rumors out there, it can use 220 grains bullets. Might be the ticket if you are really bored with the 270 Win. I believe it could be a real winner. :rofl:
 
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