Krzysztof,
I own a ranch and occasionally use the old Remington for vermin control.
LY #450229 is a HBSWC, though it does not have the lines of the more modern forms of SWC's. This is probably the best bullet I have a mould for if we're discussing hunting loads. The RN mould LY/ID #450225 performs about as well as RB's insofar as killing goes, neither seems to do quite as well as #450229. The true period sugar loaf style conicals (cast in an old, though probably not mid 19th century mould) I've tried on game aren't notably efficient on vermin, I do not recommend the use of this sort of bullet for either small game or vermin.
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Before I retired I owned a tool and die shop. I made a tool to seat the sugar loaf type conicals, the point of the bullet was invariably seated to within 0.05 mm (0.002") of true with the centerline of each chamber. The timing of my Remington is OK (checked with a range rod). Despite an effort to find a superior load I can't report that I was able to approach the accuracy easily obtained with RB's.
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I have not tried long range shooting with LY #450229 or with sugar loaf conicals. I suspect that at some point, perhaps 125 M, these two bullets may exhibit superior accuracy to that obtainable with RB's. When a rifle is "set up" for sugar loaf type conicals, including a false muzzle and starter, very good accuracy can be obtained. I could speculate as to why these conicals are less than satisfactory in a revolver, but I do not know why this is so...
regards,
Bob
A side note: The bullet I use over black powder in a .476/.455 '94 Webley WG is rather akin to the Minié design. There cylinder throats of the WG are 0.457" and the barrel groove diameter is 0.4605". The bullet drops from the mould at 0.4545" in 1:12, the alloy used in period ammunition. While not as loose as a Minié ball, the skirt clearly functions as designed. Accuracy closely approaches what can be produced with a S&W New Model #3 target revolver chambered in .44 Russian.
Bob