Trajectory

[Mrfishnhunt]

Does anyone know the 75 yard and 100 yard trajectory if I am about 1 inch high at 50? I am shooting a .490 RB with 70 gr. FFFg Goex from a 32 inch barrel. My local range only goes out to 50 yards. Thanks.

 

[bang]

Considering every gun is different this is your best for sure way.

https://www.google.com/url?sa=t&sou...FjAEegQICRAB&usg=AOvVaw2wZoeqJB_QzKQ2y6f74yWw

Think you will find, since the arc is so great, that you will be around 3-4 inches high at 50 then on at 100 but 75 will be slightly higher than 50.

 

[longcruise]

Go 3" high at 50 and you will be pretty much point blank out to 100. Pretty much any caliber ml from 45 to 62 shooting round ball big game loads will work with the 3" formula.

 

[Rat]

What Cruise said.

 

[rodwha]

According to my Lyman BPH 2nd Edition 70 grns of 3F Goex in a 32” 1:60” twist provides 1655 FPS. At 100 yds it has dropped to 1005 FPS.

I ran this through my ballistics app, which is set at 900’ with 3/4” sight height, and it gives me the same velocity at 100 yds. It shows a 2.5” high at 50 and -4.3” at 125 yds.

 

[The Old Man]

I found that 2" high @ 50 yds will put you within the "minute of whitetail" zone out to 100yds.

50yd plus 2"
75yd plus 1"
100yd minus 1"-2"

Gun Digest Blackpowder Manual:
@ 2000fps 45-58 cal
13yd 0
50yd plus1"
100yd minus1"
125yd minus6"


Hope this helps out.

 

[Loyalist Dave]

You really need your muzzle velocity....

But using the 1655 fps as mentioned in a previous post, being about 1" high at 50 yards in one online program puts your ball dead-on at 65 yards and 1" low at 75 yards, with a whopping 5½" low at 100 yards....https://ctmuzzleloaders.com/ctml_experiments/rbballistics/web_apps/rb_ballistics.html

My .530 ball at 1650 fps is about 2½" high at 50, dead on at 90, and 1½" low at 100 yards....according to the software. Which tends for me to be about right at my rifle range. I need to double check my MV too.....

LD

 

[Tom A Hawk]

My best advice is....go shoot it at various distances and learn how your particular rifle and load performs. With a little experience, aiming compensation for yardage will become second nature.

 

[SDSmlf]

My local range only goes out to 50 yards.

My best advice is....go shoot it at various distances and learn how your particular rifle and load performs. With a little experience, aiming compensation for yardage will become second nature.

Difficult to shoot various distances at OP’s 50 yard range.

 

[Bad Karma]

Does anyone know the 75 yard and 100 yard trajectory if I am about 1 inch high at 50? I am shooting a .490 RB with 70 gr. FFFg Goex from a 32 inch barrel. My local range only goes out to 50 yards. Thanks.

That’s a bummer. First thing, I would ask around for a friend or someone who has a chronograph. Your rifle may or may not behave like mine, or anyone else’s. Second, ask your new friends (the ones with chronographs) if they know of a place you can shoot out to 100 yards at least. I’m with @Tom A Hawk, the only way to know how your rifle (and you btw) behave at 100 yards is to shoot at 100 yards. From a bench initially, to establish benchmarks, but progressing to kneeling, sitting, prone, and offhand, both supported and unsupported. The more you do it the better.

Frankly, if you plan to fire on a living animal beyond the distance you’ve trained at, I would consider it irresponsible at least. That’s just me though.