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Join Date: Jun 2009
Location: Northern Berks County, PA
Re: Winchester Extreme Weather
I have an EW in 300WSM, and a SuperGrade in 264WM, so I sort of have your question "bracketed", lol.
The EW 300WSM shoots around 1.5-2" at 200 yards for me, and 3-3.5" at 300. That's with a 180gr Partition and RL17, knocking down about 2975fps.
The 264 has shot successive groups at 300 that went 2.1 and 2.2 inches. That's with a 140gr Accubond on top of RL33 and going well north of 3200fps. The 264 is my antelope rifle this year, as I'm headed to WY as well, but just for antelope, not muleys.
My 264 load has proved a little too warm, so I'm going to rework it, but I have killed a whitetail doe with it. The holes in the hide were not spectacular, but the internal damage was nothing short of catastrophic. Holy cow. The deer simply fell over. No twitching or kicking.
I think you're making a very good choice with your pick in rifles. The EW's have a good composite stock, they will take a lot of hard hunting and not show it. They are light, and they point extremely well, with good balance. The bolt on mine was a tad "gravely" feeling at first. That was gone 100 rounds in, and it's probably almost the smoothest (if not THE smoothest) M70 I own, and I have a prewar pre64, two other pre64's, a Classic from the 90's, and an XTR from the early 80's in addition to the 264 and 300WSM.
I would think hard about going light for a WY hunt. Wind is not an "if" out there. I will stick with the 140's for just that reason. If you're ok with running it over 60k psi, you'll get the 140's well over 3000, and you should easily get over 3100. Some make 3200, some don't. No matter. At those speeds with a 140 6.5mm bullet, you're working with a great BC, and should have a serious antelope rifle on your hands.