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Postman, your load of 91gr H4350 in the 450NE is close to a full power jacketed bullet load.
You must be stripping your bullets or the base of your bullet is getting damaged enough to kill accuracy. I'm not sure that a gas checked bullet would even take that velocity.
Switch to H4198 and start with around 48gr of powder and a backer rod foam wad. I have found that H4198 works the best for me in NfB and practice loadings and using the backer rod as a filler couldn't be easier.
Also, a cast bullet with a smokeless load works best when it is sized a 'thou or two over groove so, just as you are thinking, the shallower rifling in modern rifles really is put to best effect.
Don't get discouraged with using cast bullets!

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Just as an example of heavier loadings that work, I was loading 87gn H4350 (ADI 2209) under a 360gn cast bullet (weight depending on the alloy used) in my 404 Jeffery. It ran to 2416fps and shot into 1 1/4 at 55 yds with aperture sights. I designed the bullet to fit my barrel and it worked extremely well. 90/10 ww/lino alloy and heat treated with G C so a heavy load is more than possible if you get things right.

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Von Gruff.

Exodus 20:1-17

Acts 4:10-12

Edited by VonGruff (03/01/16 09:53 AM)

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