ozman
Posted 1255476318
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#9
According to my ballistics program a .223 with a 40 gr V-Max at 3800 fps with a BC of .224 (Hornady factory load) will drop about 79" at 600 yds. It will drop about 125" at 700 yds. So with 1 moa= 6.288" at 600 yds and 10 moa in both directions from center in your scope plus the 20 from the bases, you got a total of 30 moa to work with. Therefore 30x6.288=188.64 so you are fine at 600. At 700 you got 7.33x30=219.9 which is also fine. Notice though that without the bases adjustment you would be just shy at 600 (62.88" and you need 79). I hope this makes sense and helps some.

john1c
Posted 1255544555
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#10
Just curious would Burris Signature rings and -20/+20 inserts get one out to 600 to 700 yards with the 8x32 Monarch and a 223? I'm thinking the 8x32 with 20 moa plus the -20/+20 (40 total) would do it pretty easy?
What was told to me was that the Monarch 8-32 with 20 moa is total, meaning -10/+10.

ozman
Posted 1255582094
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#11
Hi Jim:
According to Sierra the 77gr. MK has a BC of .362 at velocities between 2500 and 3000 fps. I guess the answer all depends on what yardage you want to zero your rifle at. At a 100 yard zero at your stated velocity of 2800 fps my program says your bullet will drop 10.73 moa at 500 and 14.95 moa at 600. This assumes a 100 yard zero though. With a 200 yard zero you would need 9.19 at 500 and 13.41 at 600. It would seem then that you would be a tad short with the 8-32X monarch at 500 and a lot short at 600 since you have +10/-10 moa from center with that model (if I understand it right) with a 100 yd zero. With the 200 yard zero you would be ok at 500 but still a bit short at 600. It seems to me that scope was designed to be used at ranges up to about 400-500 yds really (most hunting situations). The scope I bought has 30 moa (6-24X 50 SF) which is a little more than the one you are considering, and it would be sufficient for your load at 600 but just barely. I notice though that the 4-16X42 SF has 40 moa total so that would be twice as much as the 8-32X model. That would be more than enough then at 600 yds, although you lose half the magnification. I also notice that the 3-12X42 SF has 60 moa. By the way what were they asking for that scope? And what were you wanting that scope for? Long distance target shooting? Thanks.
Hugh
PS I was just doing a little experimenting and it seems that if you wanted to zero at 400 yds it might be good at 600. Here are the moa for various ranges with a 400 yd zero with your load:
100=-7.13
200=-5.59
300=-3.04
400=0
500=+3.60
600=+7.82
700=+12.62
So it seems you COULD get it to work with a 400 yd zero at 600 yards (but not 700) although at closer ranges you sure would be shooting high (over 11 inches high at 200)!