30-30 Sight in

RDF

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I,m sigthing in my brothers Marlin, using 170gr. Remington Core-Lokt soft point.He want's it dead on at 100 yards, How much will it drop at 150 and 200 yards?
 
Dead on at 100 yards will most certainly result in a miss beyond that distance. At 200 yards bullet drop is about 8 1/2 inches. Split the difference at 100 yards.

Robert
 
A .30-30 has a 6" "point blank" range of about 200 yds. What this means is that if you have the sights set to hit 3" high at 100 yds, its trajectory is such that that will be the highest it gets before it starts to drop, crossing your line of sight again at about 170, and be 3" low just a little past 200. They really start dropping fast after that, but if it is sighted in this way, a dead on hold should result in a kill at anything out to 200 without quite as much concern for exact range estimation, holdover or drop.
As Robert said, a dead on 100 yd zero will give too much drop at any range past that if there is a chance that you will be taking any shots at more than 100. At 150 you would be right at 3" low, at 200 about 8 1/2".
bergie
 
When I hunted the rain forests of Northern California, I sighted my 30-30 Mod. 94 dead on at one hundred yards, and I never had to take a shot past 50 yards. If your brother is hunting under tight conditions such as these, then dead on is the way to go. Now tht I hunt in more open areas, I sight in three inches high at one hundred yard to get the farthest practical point blank range possible.
While I use more modern scope sighted rifles in my hunting today, That old iron sighted 30-30 still goes along for the rainy and snowy days when a scope is not the best sight to use.
You did not say if your brother's rifle was iron sighted or scoped, but either way, I'd go the three inches high rule.
Paul B.
 
Another practical rule-of-thumb would be to go 2" high at 100, which should have the gun pretty much dead on at 150 and 3" or 4" low at 200. That makes neck shots reasonable inside of 100 yards, and a body shot is hard to miss between 100 and 200...

FWIW, Art
 
If we are talking about iron sights I use the top of the bead as my reference and go for 2-3 inches high at 100.

One reason is the heavy front bead that works so well in the thick tends to cover up too much of bambi past 100 yards. If you are 2-3 high at 100, you are near on at 150, and only a few below the top of the sight at 200. You don't have to guesstimate where in the big blind spot bambi's vitals are.

Also, the standard drop chart you see is often based on a sight path 1.5 inches above bore centerline. Iron sight path is lower and doesn't converge with the bore as much as those charts show.

Tom
 
Thanks All
My brother has a 3x9x40 scope with see thru mounts. i used your info to presude him to sight-in different, now ill sight it in 2" high at 100yards.
 
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