should moderator affect zero

[a1b1e 0]

while zeroing my ruger 77/17 with my son on sunday out to a 100 yds without the mod no problem. when we put the mod back on the zero had altered should this happen (mod is a SAK, leupold 3-9 x40 ammo hornardy v-max 17gr)

thanks Al

[arveyboy 0]

the zero changes depending on whether i have my mod or not. i have a sak as well

[cyclonebri1 8]

while zeroing my ruger 77/17 with my son on sunday out to a 100 yds without the mod no problem. when we put the mod back on the zero had altered should this happen (mod is a SAK, leupold 3-9 x40 ammo hornardy v-max 17gr)

thanks Al

 

 

In my experience, yes it will. Whether it's to do will muzzle kick or the gases disturbing the projectile in the mod I don't know. I always zero with the mod on and after cleaning it.

[SNAP SHOT 194]

barrel harmonics play a big part in the shift of impact, the weight of the mod however slight will change the point of impact,

Also the bullet has futher free air to travel in, over a slightly greater distance, thus increasing velocity slightly,

pressure you tighten the mod to will also effect POI [point of impact] barrel harmonics again..........

 

think of the bullet traveling down the barrel in wave form, rolling up and down and meeting a weight at the end [the mod]

 

check out the computer image of a 6mm ppc shot and amplified 500 times........

 

http://www.varmintal.com/aeste.htm

[cyclonebri1 8]

barrel harmonics play a big part in the shift of impact, the weight of the mod however slight will change the point of impact,

Also the bullet has futher free air to travel in, over a slightly greater distance, thus increasing velocity slightly,

pressure you tighten the mod to will also effect POI [point of impact] barrel harmonics again..........

 

think of the bullet traveling down the barrel in wave form, rolling up and down and meeting a weight at the end [the mod]

 

check out the computer image of a 6mm ppc shot and amplified 500 times........

 

http://www.varmintal.com/aeste.htm

 

 

Heavy man, read 1/2 and my head hurts

[SNAP SHOT 194]

There are lots of subitle things that change POI, such as temperature, altitude, barometric pressure, wind, wind direction, bullet weight, velocity of bullet, ballistic coefficent, line of sight down the scope, mirage....... list is a long one maybe missed a few but who cares there's enough here to worry about....

 

More than just point and shoot, this is what makes long range intresting, to get a hit you gotta read into all these things and the varibles involved...

 

heavy reading is right..........

[a1b1e 0]

barrel harmonics play a big part in the shift of impact, the weight of the mod however slight will change the point of impact,

Also the bullet has futher free air to travel in, over a slightly greater distance, thus increasing velocity slightly,

pressure you tighten the mod to will also effect POI [point of impact] barrel harmonics again..........

 

think of the bullet traveling down the barrel in wave form, rolling up and down and meeting a weight at the end [the mod]

 

check out the computer image of a 6mm ppc shot and amplified 500 times........

 

http://www.varmintal.com/aeste.htm

thanks for that i thought my aim had gone for s**t

[jamie g 17]

shouldnt change the poi i have never had the problem with that on my rifles weather its 22lr hmr or 22/250.

 

the only time it mite change is ? say you set your rifle up and then after lots of shots with out cleaning the mod you clean it ! then you mite see a difference

Edited January 11, 2009 by jamie g

[jon_h 0]

Ive always been under the impression a mod would lower the POI slightly and take a slight bit of power out of the shot. Could not explain this theory though.

[endasmail 0]

i was out today ,test firing .223 ammo with the mod on(t8) had it right at 100 yards ,took the mod off and it shooting an inch high at 100 ,what can ya do ?

also if changing the type of ammo ya use the gun has to be re zeroed,hard to get the head around it all sometimes

[cyclonebri1 8]

i was out today ,test firing .223 ammo with the mod on(t8) had it right at 100 yards ,took the mod off and it shooting an inch high at 100 ,what can ya do ?

also if changing the type of ammo ya use the gun has to be re zeroed,hard to get the head around it all sometimes

 

 

I don't think it's hard, it's just a fact that you have to accept. If you change almost anything be it mod, ammo, rest etc it will make a difference. I don't think we have to understand why, just ensure shooting is done with the same gear as zeroing?

[SNAP SHOT 194]

when you put the mod on or take it off, it's barrel harmonics playing the part of shifting the POI. As well as sometimes there will be a slight increase in velocity with fitting a mod.... So all these factors will change the POI.

 

now if you shoot a light fast bullet, and then shoot a slow heavier bullet the the slower heavier bullet will hit lower on the target,

Most heavier bullets are slower. So gravity takes more effect, As its acting on the bullet for a longer period of time to the target.

 

Even shooting bullets of the same weight but made by different companies, the powder burn rate will have an effect on the velocity thus making the bullet strike higher of lower than the other bullet of the same weight,

 

hope this helps.

[cyclonebri1 8]

Lets chuck this one into the mix as well. May be fact, may be fiction, you tell me?

 

Many years ago a guy I shot rifle with was adamant that the path of a bullet leaving the barrel continued on in a spiral motion due to the spin/twist given to it by the rifling of the gun, yeah? with me? IE, forget about bullet drop and imagine the centre line of the shot. At any given distance the bullet would hit over/right/under/left dependant on distance. Again the bullet was never on target, always spining round the central hole? Hope thats clear. Factor in distance and the water is very muddy

 

Comments, it actually seems very plausible to me, maybe I'm too easy

[SNAP SHOT 194]

the only thing the rifling is doing is putting rotation on the bullet as it goes down the barrel, there is no spirial motion involved.....

 

however if the bullet is not made concentric in the factory, then a small ammount of helical rotation may come into play, but the effect will be minimal...

 

So he is in effect partly right......

[cyclonebri1 8]

the only thing the rifling is doing is putting rotation on the bullet as it goes down the barrel, there is no spirial motion involved.....

 

however if the bullet is not made concentric in the factory, then a small ammount of helical rotation may come into play, but the effect will be minimal...

 

So he is in effect partly right......

 

 

Ok, but we have all watched footy on the telly, and snooker come to that/

The effect of putting a 2 dimensional spin on the ball swerves it one way or the other? By puting symetrical/rotational spin on it, does it go straight or does it spin,dip, spin or rise. Or does ot do exactly what it is doing when it leaves the barrel?ie, fly off on a straight tangent?

As I said before, heavy man