PDA

View Full Version : The long process of dialing a rifle in...

wyobohunter
January 29, 2010, 10:57 AM
1- Develop the most accurate load for your rifle; this is a subject in its own.

2-Determine the accuracy of you/rifle/load combination. Use this sheet (formulas) to determine the maximum range capability for the game you will hunt.

Game Info and Maximum Range

V = vital area diameter (inches)
R = range (yards)
MOA = 100 yard group from field position (inches)

To Solve For Required MOA
V/(R/100)=MOA

To Solve For Maximum Range
(V/MOA)×100=R

Game Species

Moose - Full-grown males (bulls) stand almost 6 ft tall at the shoulder, and males in prime condition weigh from 1,200 to 1,600 lbs. Adult females are somewhat smaller and weigh 800 to 1,300 lbs. A 1,600-lb moose will dress out at about 950 lbs, yielding approximately 500 lbs of meat. Vitals ≈ 16”
Brown Bear - most mature males weigh between 500 and 900 lbs (180 – 410 kg) with extremely large individuals weighing as much as 1,400 lbs (640 kg). Females weigh half to three-quarters as much. Vitals ≈15"

Black Bear - Adult black bears stand about 29 inches (0.73 m) at the shoulders and measure about 60 inches (1.5 m) from nose to tail. Males are larger than females. An average adult male in spring weighs about 180 – 200 lbs. A 350-lb black bear will dress out at about 210 lbs, yielding about 120 lbs of meat. Vitals ≈10”

Dall Sheep - Male sheep, or rams, usually weigh less than 300 lbs, and females (ewes) weigh less than 150 lbs. The dressed weight of a 230-lb sheep is about 140 lbs, and a sheep that size will yield about 80 lbs of meat. Vitals ≈ 8"
Mtn. Goat - Billies are about 40 percent larger than nannies and average 260 and 180 lbs (respectively). The dressed weight of a 250-lb goat is about 150 lbs; about 85 lbs of this is usable meat. Vitals ≈9”

Sitka Black-tail Deer - The average October live weight of adult Sitka black-tails is about 80 lbs for does and 120 lbs for bucks, although 200-lb bucks have been taken. The dressed weight of a 100-lb deer is about 60 lbs, yielding about 35 lbs of meat. Vitals ≈6”

Caribou - Weights of adult bulls average 350 – 400 lbs. mature females average 175 – 225 lbs. The dressed weight of a 400-lb caribou is about 240 lbs. This equates to about 100 lbs of meat. Vitals ≈9”

Wolf - Vitals ≈7”

Wolverine - Vitals ≈5”
Lynx - Vitals ≈5” Coyote - Vitals ≈5”

3-Use ballistics program and chronograph http://www.biggameinfo.com/index.aspx?page=%2fbalcalc.ascx to build a range chart like the one below

30-06 Springfield
52 grains H4350/ 180 gr Swift Scirocco II at 2610 fps
Range 100 150 200 250 300 350 400
Elev. dn 2" dn 2" zero up 4" up 9" up 16" up 25"

3-Test the chart and make adjustments as necessary.

4-Laminate the chart at tape it to your rifle stock. All set!

I apologize, Excel doesn't cut/past very cleanly. If you are interested I can send the stuff I use, just pm me.

jmr40
January 29, 2010, 02:25 PM
Somebody has too much time to think. Cabin fever settin in on ya up there in Alaska:)

ndking1126
January 29, 2010, 04:33 PM
Sounds good.. but most of that isn't helpful to me unless you could get me a hunt up there :)

Do you know how big are the vitals in an average coyote?

wyobohunter
January 29, 2010, 05:19 PM
Do you know how big are the vitals in an average coyote?

≈ 5"

The formulas work just as good in America as they do in Alaska ;)

Art Eatman
January 29, 2010, 08:50 PM
Dial-in? Aw, check how factory stuff does for five-shot groups. Try a couple or three hand-loads. If not satisfied, tweak the forearm and suchlike. Repeat as necessary.

Generally, one MOA is easy. :) Half-MOA is better for prairie dogs, but one MOA will take care of the rest of the critters.

mrawesome22
January 29, 2010, 10:33 PM
Do you know how big are the vitals in an average coyote?

If you shoot a coyote with a .224"VMAX at 4000fps its entire body is the vitals LOL.

ndking1126
January 29, 2010, 11:30 PM
If you shoot a coyote with a .224"VMAX at 4000fps its entire body is the vitals haha, fair enough. I'm hoping to verify that soon as I recently got my first .223 :D

Jobfix
January 29, 2010, 11:43 PM
To my knowledge you need one hell of a tail wind to get 4000fps with a std. Rem. 223 & lead bullet. ;)