I've been trying to find some accuracy in a 7mm Wby mag off and on for some time now and today I finally made an accidental discovery that has me completely abandoning polymer tipped bullets in this cartridge. Passively I have been trying different loads using Hornady eld-x and sst bullets at different weights with different powders and all I have ever been able to produce was about 1-1/2" groups and only ever in a 3 shot group. I was close to deciding that this was the accuracy of the rifle but it bothered me that a Weatherby Mark V wouldn't do any better than that. Finally today as I was working up a load with Viht N-165 behind a 162 ELDX, It really stood out that shots 3 and 4 were the offending outliers. Suspecting bullet walk I checked round 3 and then round 4 loaded in the receiver after shooting the 1st and 2nd. No bullet walk but I did find that the polymer tips were smashed from the recoil of the first two shots. Next I loaded all 4 one at a time and wouldn't you know it, all 4 held a great 3/4" group. I repeated both scenarios a couple more times to confirm the result. Nice I was able to find an accurate load for my rifle, but it's pretty useless for hunting beyond having two in the rifle. I can't think of a time when I've needed a 3rd and 4th shot but I'm not willing to give up that reassurance. I'll be moving to a different bullet for this rifle. I can't be sure that this would be a problem in all magnums but the 7mm Wby is far from the hardest recoiling of them. I have used the polymer tipped ammo in several lower recoil rifles with great success but If your having issues and struggling for an explanation it may be worth checking. I'm sure many have already ran across this scenario but hopefully it's useful to somebody.