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Joined: Nov 2012
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If a 45/70 rifle were sighted in for 100 yards with a modern 300 gr factory load such as Federal.... where would the bullet hit at 25 yards?
About inch low? 2 inches low?
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Joined: Jul 2018
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only one way to know. Go to the range and find out!
You could get close with a little information: How high is the scope mounted above the bore? How long is the barrel?
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Joined: Jan 2001
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Depends on the height of your sights, although the difference between a scope and open sights wouldn't amount to a squirrel's head. Using some generic numbers for velocity, BC and sight height the bullet would be dead on at 25 with a scope or 1/2" above line of sight with open sights. if you know the actual numbers you can plug them in here. Hornady Ballistics Calculator
Gunnery, gunnery, gunnery. Hit the target, all else is twaddle!
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TC encore pro hunter with a 24 inch barrel. Scoped with a Leupold 4x33.
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Campfire Ranger
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Assuming 1880 fps which is Federal's listed MV and a BC of .197, sight height of 1.5" above the bore which is fairly standard for scopes, you're still dead on at 25 yards with a 100 yard sight in. You can fiddle with those numbers some but you won't change the point of impact by more than about 1/10 of an inch. So, if you're gonna shoot the flea off of a deer's back at 25 yards, you might go to a higher power scope with adjustable objective...
Gunnery, gunnery, gunnery. Hit the target, all else is twaddle!
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Anything being shot with a 45/70 will be just as dead at 25 yards with a dead on hold from a 100 yard zero
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I understand that. But if punching paper I was curious. A 5.56 is zeroed at 100 and is an inch and a half low at 25. The 308 pretty similar. So I was just wondering
Last edited by DrDeath; 12/10/18.
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If the 5.56 is on the AR platform, then the difference is in the height of the scope above the bore. A typical AR15 mount places the scope centerline about 2.7in above bore. In a bolt or lever gun, the scope is probably 1.5 to 1.7inches above the bore. As suggested above, plug the numbers into a ballistics calculator. For a big-bore lever gun sighted at 100yds, the bullet will cross the scope line of sight around 25yds (plus or minus 3 or 4 yards).
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