Update

Shot the Wolf 174 Grain ammo in my other No4 Mk1 yesterday and P14. Both shot the ammo fine. Pointy end through target first.

So my conclusion is that this ammo is acceptable for 4 groove barrels, but not for two groove barrels. At least that is a key difference between the my LB and other two .303 rifles.

Since SGA ammo sells this stuff for $8 per box, I will buy more, but not use it in my LB

Attached is target from yesterday. Some of the round are Herters, which also shot well. But 13 of the holes shown are the rest of the box of Wolf that keyholed in my LB.