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i shot 60rds of federal 55gr BST out of my 22-250, then the 40rd box of UMC 50gr JHP ammo...then got 3 more boxes of the federals. different lot than the first 3. first round i fired pretty much locked the bolt. it was STIFF. it was a bit hotter out that day...maybe 10-15 degrees. someone else said maybe solvent in the chamber...they could been right on. hotter temps outside also add pressure though...most factory ammo is loaded under the max and safe though..i am betting solvent in the action/chamber..i cleaned it right before i went to the range and was in a bit of a hurry....

checked the case and it was fine..not bulged or cracked or blown primer or anything...checked the action and barrel and all looked well. fired the rest of the box with no troubles....

Prairie Wolf get on the factory web site they will send you postage to return the ammo and redemtion coupon to spend on there products in liue of a cash refund . I picked up 150 brassfor 22-250 factorieswith blown primers . The manifactures take good care of customers that even try to be loyal .

OR, you can pull the bullets, weigh the charge (average of five), then reduce that charge 5%, reload acouple with this new amount of that same powder, and test-fire them. A 5% reduction will probably be enough to avoid the overage.......

As an update, I pulled the bullets on all of the ammo using a RCBS press mounted collet puller.

I weighed ten charges. They ranged from 68-70 grains of powder. The charges were compressed and I had to loosen the powder with a phillips screwdriver.

I tried 65 grains, still marked the case head, primers pretty flat.

I tried 60 grains, better, but still not comfortable.

I tried 58 grains, still had very slight markings

I tried 56 grains, and thought it looked good. At this point I fired a couple Winchester factory loads for comparrison. They had slight marks on the case head too. I decided to load them at 57 grains.

I think these rounds were supposed to be loaded at 60 grains and instead were loaded at 70.

I also think the WSM's have a pretty high bolt thrust due to the larger diameter and high operating pressure. So maybe some case head markings are normal.

Anyway, I finally have some ammo I am comfortable shooting. It is pretty bizarre to find factory rounds with 10+ grains too much powder in them.

If they were 10gr too much, it might blow the action up. 7mmWSM load range anywhere from 59gr to 72gr depending on powder. I bet they use H4831 or something liek that loading them up. And max is over 67gr.

I don't care what load, federal primers will flatten no matter what. They are not a good indicator. When you see the primer so flat, you can't feel the difference between the brass or primer with fed primers, its overloaded.

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As I posted above, I fired two shots with this ammo, and both blew the primers out out of the case. I had to pry the bolt open, and the case heads were shaved by the extractor groove.

I don't doubt that I reduced the loads more than I needed to. I also don't doubt that they were way, way overloaded the way they were.

I still think you should've sent them back to the factory takes about a week they pay for the shipping you get the product checked and get a certificate to replace the ammo with ammo or components or other products from that manif. It's a smoking deal and you just might save sombody else from a similar fate or worse.

I thought about it, but the stuff was on clearance at midway, so I figured it has been around a while. If they haven't recalled it by now, they probably won't.

I am not doubting that all. I am saying to you, that yes blown primers are indicitive of way of pressue, but I seriously doubt they were 10gr over as you said. I have several loads, that I can go up 3 grains and get blown primers.