I just ordered a box of 50 430 grain gas check Laser Cast for my 45-70 tests ( 3 rifles & a 14" Contender I'll be doing up loads for this winter ) since the ones I ordered are gas checked, they'll be for hotter loads in my guide gun & Martini safari single shot...
I like the look of the Bullets ( in 45-70 ) that SEVENS posted the link to, so I'll probably include them in the tests for more sane loads for my double rifle, & my Contender...
I've heard that some of these very hard cast bullets often break at the canalure groove, when hitting big bones on dangerous game... so I may have to do some penitration tests after I get a couple bullets I like, to make sure they are not too brittle ( this is a quote from the comments on a similar "Cast Performance" bullet )
I have used the 420 gr Cast Performance on Cape Buffalo with mixed results. On the 420 the meplat is so broad that it tends to shear off, thereby reducing penetration and weight retention.
yet this same person had great results with the 460 grain bullet of the same brand... so velocity, hardness, & bullet design all seem to effect how the4 bullet performs