Turnbolt53
Well-Known Member
Default is 10mph. Go nuts
Yeah, I would have zeroed that out too, considering we're only talking 1000 yards
270wsm vs 7 rem mag
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Yeah, I would have zeroed that out too, considering we're only talking 1000 yards
bigngreen
Well-Known Member
The comparison was kept with in a bullet line, completely reasonable way to compare if no one of the best, you can also go for best of the best for each. The best in the 270 is the Berger 170 gr EOL and you can run them mid 3000's to a little more.
Turnbolt53
Well-Known Member
I'll take your word for it, but suspect that's in a long action.
Turtle566
Well-Known Member
Thanks frog4raday for the great information as you have helped me to decide on my next Lr hunting rifle, it's great to see some logic enter all of the different options as it helps people like me that don't know heaps about all the different callibers,
Cheers
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Cheers
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FIGJAM
Well-Known Member
That isn't true - you are discounting the efficiency of the wsm case. Not all powder capacities are created equal. Short and fat is more efficient than long and thin when it comes to how that powder is used and the velocities it generates.
The only way the 7RM is superior to the 270wsm is in the bullet weights available - if you keep bullet weights and barrel length comparable the 270 wsm will always win. If you can't see that, you haven't owned both or haven't done the research, or are just to ignorant to admit it.
Also, who cares if you build the 270 wsm on a long action to seat the 170's out there a ways and increase your velocity?
bigngreen
Well-Known Member
The differences between the 270's and the 7mms will only be seen at ranges beyond their effective hunting range. I've killed bull elk out beyond 900 yards with the 270 WSM and it was extremely effective.
The WSMs built to their ideal belong in a medium length action that allows a COAL of 3.2.
Next to consider is the twist rates, in the ALRB line of bullets you need to twist them to get the long range accuracy and BC, the 270 will need a 1-9 and the 7mm a 1-8 to maximize the bullets at the top end of what is available. You also need to realize the BCs published for the ALRB are higher than reality though they have gotten close since release.
The WSMs built to their ideal belong in a medium length action that allows a COAL of 3.2.
Next to consider is the twist rates, in the ALRB line of bullets you need to twist them to get the long range accuracy and BC, the 270 will need a 1-9 and the 7mm a 1-8 to maximize the bullets at the top end of what is available. You also need to realize the BCs published for the ALRB are higher than reality though they have gotten close since release.
MudRunner2005
Well-Known Member
Why would you use RL22 for the 7RM? That's a fast powder. You'll hit pressure before reaching velocity potential. Try it with something like 7828, 7977, or H1000.Deep.
And if you go to this website:
https://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi
And plug in these numbers:
.270 WSM (150gr ABLR @ 3,187fps using 68gr MagPro powder w/G1 BC=0.591)
7mm RM (175gr ABLR @ 2970fps using 62.5gr RL22 w/G1 BC =0.648)
You, TOO, could calculate for the wind drift you so desperately seek. Default is 10mph. Go nuts
Buckys
Well-Known Member
Apologies for diverging a bit from the original post, throwing out the 270wby as another consideration.
I was feeling an itch for a new 277 round this year after my first and my go-to 270win started to be claimed by my eldest son when we went hunting. Plenty of gun for deer hunting in Texas and I have a couple 300 mags for heavier game situations as well as a 7rm.
I was close to getting a 270wsm but ultimately decided to try the 270wby instead. Slightly more case capacity than my 7rm and I really don't think 2.5% less bullet diameter between 284 and 277 is enough to worry about (vs. 5-8% when comparing 277 vs. 264 or 284 vs. 308). Of course, the 7rm has a great selection of bullets greater than the typical 130-150gr 270xxx options. Which is why I have both
I primarily shoot the 162 SST superperformance in my 7rm, 150 fusions in my 270win and 140-150 ABs in the 270wby. All three are 700 actions and very accurate - the first two are 0.5-0.75 MOA on my good days although the 'bee is below 0.25 MOA on a good day and in the 0.1's on a great day. All of that is factory ammo (I use my RCBS and/or Hornady concentricity gauges to sort out any rounds with more than 0.005 run-out) which is fine in Texas where 99.999% of my shots are 400-500 yds or less and 99.9% are 300 or less.
I was feeling an itch for a new 277 round this year after my first and my go-to 270win started to be claimed by my eldest son when we went hunting. Plenty of gun for deer hunting in Texas and I have a couple 300 mags for heavier game situations as well as a 7rm.
I was close to getting a 270wsm but ultimately decided to try the 270wby instead. Slightly more case capacity than my 7rm and I really don't think 2.5% less bullet diameter between 284 and 277 is enough to worry about (vs. 5-8% when comparing 277 vs. 264 or 284 vs. 308). Of course, the 7rm has a great selection of bullets greater than the typical 130-150gr 270xxx options. Which is why I have both
I primarily shoot the 162 SST superperformance in my 7rm, 150 fusions in my 270win and 140-150 ABs in the 270wby. All three are 700 actions and very accurate - the first two are 0.5-0.75 MOA on my good days although the 'bee is below 0.25 MOA on a good day and in the 0.1's on a great day. All of that is factory ammo (I use my RCBS and/or Hornady concentricity gauges to sort out any rounds with more than 0.005 run-out) which is fine in Texas where 99.999% of my shots are 400-500 yds or less and 99.9% are 300 or less.
I got the G1 BCs directly from Nosler's website as of yesterday and plugged those in. I did not use the 'default' values in JBM.
The 'idea' from the OP was to compare the 'max' velocity of the .270 WSM with the 150gr ABLR to the 'max' velocity of the 7mm RM with the 175gr ABLR. I went to the Nosler reloading data, picked the highest velocity (max load) posted for each and posted those numbers (velocity achieved, powder used, and grains used.) I did not "pick" RL22 - Nosler did. It posted the fastest velocity in the powders they tested with that bullet, at a safe pressure.
Creedmoor shooter
Well-Known Member
They're both close and great rounds. I've often been intrigued by the 270 wsm. In the long haul, if your comparing the best bullet out there for each, the 7mm rem mag will out run the 270 wsm. However, at conventional hunting distances I highly doubt any critter or shooter would tell the difference. 7mm will carry more down range energy and have less wind drift in general if your using a halfway decent bullet at a non anemic velocity. The 7mm rem mag with a 180 eld at 3000-3050 fps is a beast. Bullet selection just hasnt caught up for the 27cal yet which is why the 7mm should in general have a slight edge.
bigngreen
Well-Known Member
There is a .006 BC difference between the 270 170 gr EOL and the 180 HVLD in the 7mm, both bullets are my favorite for on game function in each cal, the 270 WSM built for them will run them 3050-3100 fps, the 7 Mags I've set up will run the 180 in the 2950 range, the 7mm-300 Win will run them 3100 fps, both with the best powders and brass. There is literally no difference between them unless you start changing up bullets or have a stupid fast barrel in one and slow in the other, it's 6 one half dozen the other. If your a 270 guy I'd rock that, I am and just have better times with the 270 VS my 7 mag, 7-mm300 or 28 Nosler, I'll do the same thing with a 270 and it makes me happier!!
elkaholic
Well-Known Member
Or soon a 7 max
