BAR 270WSM jamming

It works fine until about the 10th round, hopefully it only takes 1 round in deer season. Maybe its just not meant to fire repeatedly like that.
 
Bring a can of WD40 along and spray the inside of the action holding it sideways so any fouling and crap can flow out of the pening of the action. If that fails, it may just need a good tear down and cleaning. Check for any metal or copper shavings throughout.

If it still fails after X amount of rounds, I'd consider bringing it back and sticking with a ..308 or 30-06 cartridge designed for auto use.
 
I think the factory WSM might be loaded too hot for your gas gun. It makes sense to me that the first few rounds cycle fine then as soon as a bit of powder fouling is introduced to the action problems begin to occur. If you can handload and drop your charges a full grain below maximum, chances are your cycling problems will disappear and you won't miss the 50 fps you may or may not loose.
 
Do you honestly think that during the developmental collaborations of the WSM's, between Browning, Nosler, Winchester that they forgot about, or didn't worry about their OWN BRAND of "semi's and if they'd properly function or not??...got to be a gun issue...not the round.
 
Do you honestly think that during the developmental collaborations of the WSM's, between Browning, Nosler, Winchester that they forgot about, or didn't worry about their OWN BRAND of "semi's and if they'd properly function or not??...got to be a gun issue...not the round.

Modern cartridges since the 7X57 have been designed with a tapered case. A cartridge with a tapered case has a much shorter distance to move in order to break contact with the chamber walls than an un-tapered cartridge does. Most semi autos were designed to operate at about 50,000 PSI rather than 60,000, so the combination of an un-tapered cartridge operating at very high chamber pressures could lead to unintended consequences. Loading a few rounds a grain under max just might resolve the problem with no further expense, no down time, and with no practical loss of performance. It does no harm to try, before one assumes the rifle is to blame.
 
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