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Old 10-17-2019, 04:07 PM
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Quote:
Originally Posted by YYC338 View Post
Not exactly true. Monometal bullets (Barnes x bullet, etc) have a much longer contact surface than a cup and core bullet of the same weight and don't operate at the same pressures for a given powder type and weight.

They need to be treated differently
Actually you are repeating an often made comment that is no longer true. It originated with the original Barnes Monometals that aren't made any more. Their new, last 25 years at least, Mono bullets have large rings on the bullet that actually reduce the contact area to be the same or in some cases less than same weight Cup and Core bullet.

If you check Barnes load Data for their 140 grain TSX and TTSX you will find their max published load for CFE223 is 1.1 grains higher than Hodgdon's load for the 140 SFT SP. The same is true for 4064 41.4 Barnes vs 40.5 Hog, The only one they list as lower is Varget 41.2 Barnes, 42.2 Hog
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