Slug velocites.

To what distance? It really depends on what projectile. The Altaros I shoot between 880 to 930 fps and targets go out to 550 yards. When I shot 40 gr javelins at 1020 to1040 fps I shot out to 200 yards. Both acurate but swap the speeds for the projectiles and they will both not shoot as expected to their targets. Actually I'm pretty sure I will not be able to see where the Altaros will hit at 1040 fps with a 1:16 to 18 twist.

Allen
 
I've encountered everything from 770fps to 1050fps for different slugs.

.177 13.43gr KO slugs at 930 shooting golf balls back to back to back at 130yds.

.22 30gr javelins at 960fps getting headshots out to 160yds

.254 38.5gr NSA at 960fps cloverleaf groups at 140yds, inch- 1.5 sized groups at 180yds

.30 H&N 50gr/54gr 930fps/880fps within 3/4" at 110yd with no wind
 
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The distance is totally irrelevant. I'm only interested in what muzzel velocity you found gave the tighest groups at what ever distance you choose to test at.
unfortunately that's not the case. For correct selection of muzzle velocity is the primary distance to be shot at is extremely crucial.
If I shoot at 50m airgun benchrest, I can easily have a speed of 750-800fps, but if I want to shoot at 1000 yards, then for greater accuracy, a higher speed will have an advantage. Conversely, a speed above 1000fps at 50m will have the opposite effect in terms of accuracy, as the bullet will be more affected by the wind.
Everything is related to everything, this is essential for every shooter to realize if they want to shoot really accurately.
 
unfortunately that's not the case. For correct selection of muzzle velocity is the primary distance to be shot at is extremely crucial.
If I shoot at 50m airgun benchrest, I can easily have a speed of 750-800fps, but if I want to shoot at 1000 yards, then for greater accuracy, a higher speed will have an advantage. Conversely, a speed above 1000fps at 50m will have the opposite effect in terms of accuracy, as the bullet will be more affected by the wind.
Everything is related to everything, this is essential for every shooter to realize if they want to shoot really accurately.
There is only one MOST accurate. if your slugs are more accurate at 1000yards then any other distance, then that’s the velocity I was interested in. 👍🏻
 
There is only one MOST accurate.
No, it's not. Download some better ballistic software, make a slug profile at say 30fps between each profile , put in a crosswind and start observing the results of the crosswind deviation. Try it at 50m-100m-200m and you'll understand what I'm trying to say.
if you had better SW, you could start to observe the vertical behaviour of the slug for different distances, at different speeds and for different head or tail wind speeds.

if you're really only interested in the question as you asked it, the answers will only be:
Slug brand and muzzle velocity, with no further information, which seems to me to be a completely irrelevant topic.

If I try to generalize your question, then is as accurate as "what is the best car in the world" without stating for what purpose.
 
Alters, thanks for your long explanations, but I’m just asking a simple question...

I’m not interested in what brand of slug u have chosen, everyone has their preferences. (Because they think that brand is the most accurate in their rifle).
I’m not interested in what caliber u shoot, everyone has their preferences. (Horses for courses)
I don’t care what distance u shoot them to.
I don’t care if there is a side wind, cross wind, cold wind or no wind. Not interested.
I don’t care if you shoot paper, or metal or fur or feathers.

All I’m asking is what velocity are u pushing them to when they leave the muzzle of the rifle.
It really is a simple question and the answer should just be 3 or 4 numbers followed by fps. 👍🏻