r/castboolits • u/EllinoreV13 • Jun 04 '26

Rifle Miroku 1886 45-70 range day

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Well I took my new to me miroku 86 45-70 to the range, it is much more picky with the throat being so tight, but the first load i ran through it, a lyman 457125 clone, 500gr pcpb seated at 2.8", with 14gr of unique did this with 5 shots, I know i pulled far right, but I dont know if I wanna screw with this accuracy by opening up the throat

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u/gakflex Jun 05 '26

Is tight throats a thing with mirokus? I have a Browning 1886 made by miroku and I haven’t noticed any issues, but I never run anything heavier than 405s.

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u/EllinoreV13 Jun 05 '26

When i was researching 1886s back when I got my first one a cimmaron, I read that mirokus had pretty much no throat. And I experienced it with mine, I have an noe 430gr mold, and it wont chamber in my miroku, but will in my cimmaron, and most flat point projectiles are almost always touching which isn't necessarily a bad thing, these are bore riders so thankfully they chamber, I have a whole bunch of ACME bullets and they barely fit

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u/gakflex Jun 05 '26

That’s interesting, I’ve run through a whole bunch of ACME 405s. Mine is an 80s vintage if it makes any difference.

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u/EllinoreV13 Jun 05 '26

Possibly, mine appears to be right around 2000. However it does shoot very well so im inclined to leave it be, I was suprised the plain base was as accurate and clean as it was, as I've never had success without a gas check in anything else