Gain additional velocity by shooting prone ...

[Canhunter35]

So...theoretically if you weigh 300lbs your gun will shoot faster than if you weigh 100lbs because you offer more resistance

 

[adam32]

So...theoretically if you weigh 300lbs your gun will shoot faster than if you weigh 100lbs because you offer more resistance

Exactly! Just a bunch of malarkey!

If they really want to test it then get a lead sled and start with zero weight on it and continue adding weight until the rifle doesn't move at all.

Once the rifle doesn't move at all it should have CONSISTENTLY (key word) higher velocities over a string of shots than when it had zero weight added.

 

[RockyMtnMT]

Exactly! Just a bunch of malarkey!

If they really want to test it then get a lead sled and start with zero weight on it and continue adding weight until the rifle doesn't move at all.

Once the rifle doesn't move at all it should have CONSISTENTLY (key word) higher velocities over a string of shots than when it had zero weight added.

Going to require a 0 es load to get perfect data!

In all seriousness there is probably something to this. The key is there is not much to it. How the rifle recoils effects many things. I do not think 20fps will change poi at 200y. How the gun moves will change poi.

My .02

 

[Canhunter35]

Exactly! Just a bunch of malarkey!

If they really want to test it then get a lead sled and start with zero weight on it and continue adding weight until the rifle doesn't move at all.

Once the rifle doesn't move at all it should have CONSISTENTLY (key word) higher velocities over a string of shots than when it had zero weight added.

After seeing all the posts from reloaders stumped because they're chrony results don't match real world data(es/sd obsession) and now this I'm not sure chronographs aren't more of a hindrance than tool because so few seem to use the data appropriately.
Edited: there probably is slight difference but shooter error will negate any difference

 

[CJS-6.5]

So...theoretically if you weigh 300lbs your gun will shoot faster than if you weigh 100lbs because you offer more resistance

Yep. If you weigh 500 lbs you will only need a .223 to hunt elk. The added velocity turns it into a .270. I am eating 10,000 calories a day, and not exercising so I can up the power on all my rifles.

 

[TG-5150]

Going to require a 0 es load to get perfect data!

In all seriousness there is probably something to this. The key is there is not much to it. How the rifle recoils effects many things. I do not think 20fps will change poi at 200y. How the gun moves will change poi.

My .02

I agree and can see were an e.s. in the low teens and this magical 20fps coupled with a cold bore long range shot could have a definite change on the POI. But was also wondering about the recoil taming rifle rests. We have a Caldwell Solo and it seems to help POI at 300 and beyond.

 

[MudRunner2005]

After seeing all the posts from reloaders stumped because they're chrony results don't match real world data(es/sd obsession) and now this I'm not sure chronographs aren't more of a hindrance than tool because so few seem to use the data appropriately.
Edited: there probably is slight difference but shooter error will negate any difference

To those who don't know how to properly run a chronograph, and to those that think it's actually physically possible to have a 0 ES/SD load, yes, the chrono is more of a hindrance. Those chasing perfection will constantly be pulling out their hair. But, for those of us who live in reality, we use it as a guide tool to help us. We know it will never zero-out.

 

[WildRose]

So...theoretically if you weigh 300lbs your gun will shoot faster than if you weigh 100lbs because you offer more resistance

Basic physics. There's a given amount of force created when the powder ignites. Some of that will be used to push the gun back, some to push the bullet forward. The less the gun is allowed to move, the more of that force remains to push the bullet.

Again, it's not enough to make any significant difference that I can see but the physics is sound.

 

[MudRunner2005]

The bullet has left the bore before recoil ever starts being strong enough to be felt. The gun might move a couple MM's before the bullet leaves the bore, but it's long gone and so are the gasses that propel it, before any felt recoil could cause this issue.

This is why I think it's all a matter of his eye relief and cheek weld position change from bench to prone that is causing the POI shift.

 

[GPR23]

So...theoretically if you weigh 300lbs your gun will shoot faster than if you weigh 100lbs because you offer more resistance

Actually yes, its called physics. Remember from science class good ol mister Newton. Every action has an equal and opposite reaction.

If a gun is held still against a brick wall and has no movement then all the energy is transferred into moving the bullet forward. If the gun moves backwards, then some of the energy is being loss pushing the gun backwards, thus less energy for the bullet.

Now whether there is enough difference to matter is whats up for debate. I have seen the video before and my first question is what is the affect on a bigger dude like myself? Frank is a small guy, so I can see him being pushed around more and there being a measurable difference in muzzle velocity. But I'm a larger guy, so i wonder if a mv difference could be measured? Not really that worried about it, as there are a million more important things to worry about when shooting long range.

 

[FEENIX]

Similar discussion from a physics forum ...

https://www.physicsforums.com/threads/does-recoil-movement-amount-affect-muzzle-velocity.900087/

 

[NEMTHunter]

The bullet has left the bore before recoil ever starts being strong enough to be felt. The gun might move a couple MM's before the bullet leaves the bore, but it's long gone and so are the gasses that propel it, before any felt recoil could cause this issue.

This is why I think it's all a matter of his eye relief and cheek weld position change from bench to prone that is causing the POI shift.

I could see this for sure. The strong recoil comes from all the pressure leaving the barrel. If that were not the case, then muzzle brakes would not work!

The thing that gets me is the fact he tested both ways. and depending on how he did it he had a different FPS reading.

I would like to know if he tried a loose hold laying prone.....

How you hold the gun DOES for a fact change impact regardless...

 

[adam32]

Muzzle brakes cause less recoil...therefore muzzle brakes make rifles slower...muzzle brakes are bad!!

 

[can1010]

having shot from bench and prone with magnetospeed attached I will call BS on speed change and can get the POI shift from changing preload on bi pod. I can get 20 fps change if magnetospeed is loose and slips even a 1/4 inch but when everything is working right my 284 win is single digit ES and same speed either way