I haven't tried the projectiles mentioned, but I got better groups with the 50g American Eagle than what I did with the Winchester Powerpoint? 64g.
If I recall rightly, I think the AE 50g grouped better than the Hornady brass training 55g stuff.
And yes, the WW VEX-SS has a 1:8 twist.
When I start reloading (I keep telling myself I will, maybe I'll buy a fancy Dillon 1050 press as a Christmas present instead of a jetboat) I'd like to try the 53g rounds everyone seems to rave about.
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