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Re: How to use the BDC on my rifle scope
Take a rifle with a properly installed BDC bullet drop
compensating reticle to a rifle range. Using ear protection zero the
scope reticle so that the point of impact corresponds to the center of
the cross hairs at the distance you have selected - typically 100 or 200
Determine the trajectory of the specific cartridge you have
selected. There are several ways to do this. Ammo manufacturers publish
trajectory and wind drift information. There are web based ballistic
calculators like http://www.biggameinfo.com/BalCalc.aspx which will tell
you how much your bullet drops at known distances.
Scope manufacturers like Leupold can be a valuable source of
information about their reticle: "Leupold® Ballistic Aiming System:
Boone and Crockett Club® Big Game Reticle aiming system provides a
series of additional aiming points to improve your ability to shoot
accurately at longer ranges. Nikon
also provides good information suggesting the marks on their reticle be
used for zero at 100yds followed by circles below representing 200, 300,
400 and 500 yds if the cartridge travels around 2800 ft per sec. Nikon
suggests the center cross hair be zeroed at 200 yds for magnum calibers
traveling around 3000 ft per sec. We understant that each variation of
different bullet weight and powder charge changes trajectory and a scope
manufacturer can not build a different reticle for each different
cartridge made so practice on the range to determine how well the marks
relate to the actual impact of where your bullet strikes at a know
distance is important. The one thing that people using BDC scopes
typically have problems with is that a BDC scope has the reticle in the
second focal plane of the scope. If the reticle was in the first focal
plane of the scope the reticle would look smaller on low powers like 3x
and grow proportionately larger as the power increased to say 9x top
power. The problem is that while the marks on the BDC reticle correspond
accurately to the bullet drop at the know distances 200, 300yds etc.
What happens when you lower the power from the scopes maximum power to
any other lower power is the reticle stays the same size and the field
of view within the scope increases which means that the distance between
these marks on the BDC reticle no longer corresponds to the point where
the bullet will strike. In short BDC reticles only work at the maximum
power of the scope or at a set specific power. At all other powers these
BDC reticles do not accurately represent where the bullet will strike.
The center X always remains the same. If you zero at 100
yards and you know that your bullet drops 8 inches at 300 yards you
could forget about the BDC marks and hold the center X 8 inches high -
that works at any power 3x or 9x and should be used at lower powers. If
you zero the center crosshair at 100yds and have the BDC scope at the
maximum power 9X then the first line or circle below the center X should
be the mark you place on the center of the 200 yard target----- the
bullet strike should hit the center. If by some chance you put the scope
on 3x and placed that first mark below the center cross hair on that
200 yard target you would shoot over the top of the target. This is
because as the power of the scope decreases the field of view increases
the angle increase and gets wider. You can experiment with known power
settings and see at a specific power say 3x what that first circle down
corresponds to and make notes because at any set power what the marks
correspond to will be repeatable.
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Here are some basic .30-30 specifications of interest to handloaders: bullet diameter .307-.308", maximum COL 2.455", maximum case length 2.039", MAP 38,000 cup.
Medium burning rate rifle powders work best in the .30-30 with bullets in the popular 150-170 grain weight range. Examples of popular powders include IMR 3031, IMR 4895, H335, H4895, RL-15, and W748. For decades I have used IMR 3031 behind the 150 grain Speer or 150 grain Sierra Flat Point bullets and CCI or Winchester primers with excellent results.
The Hodgdon Data Manual No. 26 shows that 31.0 grains of IMR 3031 powder will drive a 150 grain bullet to a MV of 2184 fps, and 33.0 grains of IMR 3031 will drive a 150 grain bullet to a MV of 2364 fps.
The same source shows that 30.0 grains of H4895 powder will give a 170 grain bullet a MV of 1919 fps, and 32.0 grains of H4895 will give the 170 bullet a MV of 2212 fps.
An unusual load with very low recoil that is excellent for plinking and small game or varmint hunting with a .30-30 rifle is a 100 grain bullet in front of 15.0 grains of SR 4759 powder for a MV of 1834 fps, or 18.0 grains of SR 4759 for a MV of 2034 fps. These loads give excellent accuracy in my Winchester Model 94.
Redfield and Vortex brands make good entry level scopes with good clarity, durability, features and warranties. If you plan on hunting a scope with a low power around 3-4x and a high power of 9-12x with a bullet drop reticle like the Vortex BDC would be a good choice.
This depends entirely on what class of cartridges the scope was built for. Different cartridges will drop more or less at a specified distances based on starting speed and ballistic coefficient. If your scope is built for a .223 and you are shooting a .223, then it will work fine. If you mounted it on a 45-70 however, the bullet will drop much more quickly and your necessary scope adjustments will not match the markings on your scope.
! click is 1 inch @ 100 yards, provided you have the correct scope for the rifle.
If you are sighting in a .22 LR 40 grain match velocity bullet for 100 yards, the mid range trajectory (50 Yards) is 6" higher. The bullet has a 6" arc half way to your target. If you are sighting in a .270 with 150 grain blunt tail bullets for 250 yards, the mid range trajectory is .4 higher. It only has 4/10" arc half way.
You most match the scope to the gun, and the 1 click= 1 inch rule will apply. Otherwise, it's lock it into a righd mount, fire it and adjust the scope accordingly. If you want to change the range on the scope, it will be guesswork.
I use a Bushnell Banner 3-9X40 with BDC. If you have BDC, make sure you have the correct distance ring in for the caliber.. It will make all the difference in the world.
its not a bullet problem you can shoot that out of your hawken muzzeloader your problim is getting the pan powder to ignight your powder in the barrel you need to make shure powder never got damp now on your hawken you have a removable torch hole were the pan powder lays take that out and just drill the hole out bigger not much just a little bigger in the part you took out this will make your hawken fire without any problem i have done this to many hawken rifles and its like night and day how it fires hope this helped ya out and good luck