Who's stretching it out with a 270 WSM?

[elkregulator]

I missed it, when are the berger 170's expected out?

Anyone put the 175 matrix at alpha mag length?

 

[JARHEAD1371]

They should be out this summer I believe.

I missed it, when are the berger 170's expected out?

Anyone put the 175 matrix at alpha mag length?

 

[beretzs]

I have been shooting my 270WSM since about 2004, right after my 2nd go in Iraq. Wanted a new rifle and got my M70 Laminated while home on leave. It has been an excellent rifle for me. I took my largest bull with it and a good muley along with a few WT's..

I shot the above with 140 AB's.. After that I messed with 130 IB's a little. Got nearly 3400 out of them and they shot well, but I decided to go heavy with it.. At least heavy for me..

I use the 150 BT as my range/steel/deer bullet and the 150 PT for real elk hunting. I use RL22 and both loads run 3125 or so out of my rifle with identical loads. It isn't a LR rig like you all run, but I can dial up and smack steel to 600, which is as far as I can shoot currently

150 PT Golds

150 BT

150 PT

I love the 270WSM. I have a 300WSM and 7WSM as well, but I just love to shoot the 270WSM. Great write up, sounds like some new bullets to really let us 270 guys stretch a little more.. Great shooting guys!

 

[Buano]

I think you'd need a long pipe to push the 170s at 3100, but if you could... Wow. Theres a performer for you. I can't think of an animal in NA I wouldn't hunt with the WSM filled with 150 Partitions.

I've got a .270 WSM & have had others. It is a great cartridge — virtually identical in performance to the 7 MM Rem mag., but it's not a dangerous game cartridge. A coastal brown bear deserves more respect, respect via bullet size. Hunting big bears with less than a .338 has been done, but that's a dangerous proposition. A .338 or a .375 is a more fitting round for a big bear that can turn from hunted to hunter in an instant.

 

[MuleHunter]

I'm shooting the 175gr matrix out of mine at 3k fps with a 700bc. Loaded to 2.950" OAL (-.020"j) in a chamber with .180" freebore. Im sure if you went with a .150" freebore you could mag feed in the alpha mags just fine. Im using Seekins DBM for an internal OAL of 3.100", giving me plenty of room to chase the lands.

 

[65WSM]

I have a couple of hundred rounds of load development work with the .270 WSM in a Winchester 1885 High Wall (Miruko). I have focused on the 140 and 150 gr ballistic tips an 140 ABs. The .277 140 Accubond has a BC of .496. That results in 6 or 7 inches less drop at 400 yds than my 6.5 WSM or 6.5 X 284 with similar bullets.

I need some help with 150 gr B'tips or other 10 twist heavy bullets. What powder are you using? I just tried a compressed load of Magnum with disappointing velocities and performance. I have tried Retumbo (which is the answer in the 6.5 WSM) Reloader 25, Winchester 780, MagPro, 4000MR. and the best I get is 3110 with a heavily compressed load of 4000MR.

MagPro is magnificient in the 270 WSM with 130 and 140 gr bullets. I can get 3300 fps with MagPro with 140 gr bullets and still not use as much powder as the book says is max. lightbulb

 

[beretzs]

I have a couple of hundred rounds of load development work with the .270 WSM in a Winchester 1885 High Wall (Miruko). I have focused on the 140 and 150 gr ballistic tips an 140 ABs. The .277 140 Accubond has a BC of .496. That results in 6 or 7 inches less drop at 400 yds than my 6.5 WSM or 6.5 X 284 with similar bullets.

I need some help with 150 gr B'tips or other 10 twist heavy bullets. What powder are you using? I just tried a compressed load of Magnum with disappointing velocities and performance. I have tried Retumbo (which is the answer in the 6.5 WSM) Reloader 25, Winchester 780, MagPro, 4000MR. and the best I get is 3110 with a heavily compressed load of 4000MR.

MagPro is magnificient in the 270 WSM with 130 and 140 gr bullets. I can get 3300 fps with MagPro with 140 gr bullets and still not use as much powder as the book says is max. lightbulb

I am running RL22, CCI250, WW cases. I get right at 3130 for both the PT and BT's. Plus, they shoot pretty well.

Magpro doesn't work with the 150's for you?

 

[TannerGun]

Anyone care to comment on the temp stability of '22 vs. Magpro? Trying to decide which route to go...

 

[beretzs]

Couldn't really say. I do my load work in the Spring/Summer and shoot all year long. Haven't really noticed too much difference with RL22 or Magpro, in my case. I do notice that RL22 will climb in speed if shot quickly, due to chamber temps, but if allowed to cool, RL22 has been excellent as has Magpro.

 

[Truc]

Same here RE 22 and 150 bullets excellent velocity and accuracy and Reumbo for the 165 gr bullets

 

[beretzs]

Same here RE 22 and 150 bullets excellent velocity and accuracy and Reumbo for the 165 gr bullets

I have heard great things about Retumbo/RL25 and the 140 AB's as well. Just haven't messed with it as RL22 works pretty well for me.

 

[longarm]

Can anybody tell me how fast I would have to get the .277 170 grain Bergers to stabilize in a 1 in 10 barrel? I am currently getting 3,420 fps with 140 grain Accubonds out of my 270 Dakota with 27 1/2 inch 1 in 10 barrel, so I could probably push the 170s at about 3,100. Also, I am thinking of a very heavy 28 inch barrel with 1 in 10 twist on a 270 WSM built on a long action or single shot bolt action to seat the projectiles way out, for varminting past 500 yards. I am aware that 1 in 10 twist is a bit slow.

 

[65WSM]

First we need to know the length of the Berger 170 gr bullets to use a formula to figure out the stability of the bullet. The Greenhill formula is the best known but RSI says they have a nore accurate one.

Second, what kind of powder are you using and what charge. It sounds like you have a real impressive load. Remember that 140 Accubonds have a higher BC than the Bergers.

For 170gr bullets I would expect that VV N-570 would be your highest velocity powder.

 

[bigngreen]

Can anybody tell me how fast I would have to get the .277 170 grain Bergers to stabilize in a 1 in 10 barrel? I am currently getting 3,420 fps with 140 grain Accubonds out of my 270 Dakota with 27 1/2 inch 1 in 10 barrel, so I could probably push the 170s at about 3,100. Also, I am thinking of a very heavy 28 inch barrel with 1 in 10 twist on a 270 WSM built on a long action or single shot bolt action to seat the projectiles way out, for varminting past 500 yards. I am aware that 1 in 10 twist is a bit slow.

Punch your numbers into JBM stability calculator. JBM - Calculations - Stability

Your going to need to be 6000ft plus, I'm going to give them a try out of my WSM since the Matrix stabilize fine for me but bullet design makes a difference as well.