Cast Bullets for 6.5 Grendel in AR-15?

[kcofohio]

I see this all the time and have no idea why things like "a good coating of HiTek will get you to about 2000 FPS without leading" this keep getting posted???

2000fps is child's play for a coated bullet. Back in 2013 I was testing coated bullets looking for an alloy for hunting. A cast bullet that was not lube/temp dependent appealed to me. As you can see the lower velocity bullets shattered and the 2300fps bullet bent. That 230gr/50,000+psi load/bullet has an alloy I still use to this day.
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The pc coating stays on and has to mechanically be stripped off.
The pc coating does not fail causing leading

Some coating will actually start to scorch/burn when driven too hard from friction. When I started pushing pc'd bullets over 2700fps I started seeing this in the bbl.
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Simple enough to fix, I simply tumble lube the pc'd bullets with 45/45/10 or give them a light coat of johnson's paste wax.

Anyway you don't get leading from a coated bullet unless there is a mechanical issue like the coating got scrapped off during seating the bullet. Crimping too much cutting ("cutting") thru the coating. Scraping the coating off from edges in the chamber or rough spots in the bbl, etc.

Thanks for sharing that!

 

[rdnktrkr]

When I was testing my Grendel I found the heavier bullets, 123gr, liked the lower powder range and the lighter bullets, 90gr, liked almost max load, I never tried the 140gr but I have a few different 140s that I will try next time out and see how the compare.

 

[John#2]

Yes, you nailed it!!!!

Bore riding bullets have their place but that design was never designed for high pressure/hv loads. The other thing to avoid is bullets that don't have a strong nose or a long unsupported nose. Pointy nosed bullets tend to have issues. Playing around with a cramer bullet cast from a 2-cavity mold. 1 cavity is a sp, the other cavity is a hp version of the same bullet. Because of the hp pin the hp bullet now has a flat nose.
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The sp bullet is 60% supported. The hp bullet is 66% supported. A target from 3 years ago with both bullets doing 2450fps+ 10-shot groups @ 100yds.
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Thank you for the confirmation.