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45-70 vs 45-90 vs 45-110 ladder site

pranqstr
Hi,

I'm wondering if anyone about 45-xx ballistics: The old 45-70 cartridges had ladder sights based on the 300gr or the 405 gr bullet?

How much change is there between the 45-70 ladder and the more powder sights (45-90 and 45-110)? I know it is a significant amount, but does anyone have specific ballistics?

Any idea where to get the repro 45-90 or 45-110 precision ladder sights?
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Comments

7 comments

Date Votes
  • tsr1965
    pranqstr,

    Hello and welcome to the forums here on GunBroker.

    I got a ladder sight for my 1886 repro from Brownell's. It took a bit, but after toying around with loads, I have one that fits it pretty well, and seems to be fairly close to the original 405 grain load.

    Being that the more powder rounds like the 45-90, 45-110, and 45-120 are a hand loading proposistion, I would imagine you could find the sweet spot there too.

    Best
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  • Tailgunner1954
    quote:Originally posted by pranqstr
    The old 45-70 cartridges had ladder sights based on the 300gr or the 405 gr bullet?


    Umm IIRC the Carbine load used a 405gr bullet, while the rifle load used a 500gr bullet.
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  • pranqstr
    Thanks,

    I was looking for if zeroed at X yards, the bullet will drop XX at 100yrds going XXXFPS, 200yards going XXXfps , 300yards going XXX FPS etc...

    Or even if you have the intial muzzle speed of a 405gr bullet in 45-XX, I can alculate the drop, as I'm sure I can find the BC.

    thanks
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  • tsr1965
    quote:Originally posted by pranqstr
    Thanks,

    I was looking for if zeroed at X yards, the bullet will drop XX at 100yrds going XXXFPS, 200yards going XXXfps , 300yards going XXX FPS etc...

    Or even if you have the intial muzzle speed of a 405gr bullet in 45-XX, I can alculate the drop, as I'm sure I can find the BC.

    thanks


    I can get you the charts I have, from my ballistics software. I have one curve that I use because I have a BPCR 1885 that has a sight that is adjustable in MOA...so it is easy to make adjustments while the ladder sight on the 1886 is already marked in yards.

    Best
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  • pranqstr
    that would be cool.

    Do they actually make 45-90 or 45-110 sights for the 405gr bullet? From what i understand, the makers just use a heavier bullet, correct?
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  • Hawk Carse
    A proper .45-90 Winchester sight calibrated in yards, would be for a 300 grain bullet.

    Most modern sights have arbitrary graduations because they don't know what caliber they will be used for and cannot afford to stock a different ladder for everything out there. You have to shoot the gun and maybe mark the range elements for yourself.

    Vernier tang sights used by target shooters are graduated in hundredths of an inch but the barrel lengths involved make that very close to MOA and is usually taken as such by shooters.
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  • pranqstr
    That's interesting. Does anyone know what the average 300gr bullet velocity is in the 45-70 vs 45-90 vs 45-110?

    thanks
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