Inch High

[TWOTWOTHREE 152]

Where's the crap advise in this thread? Apart from a bolt clean and oiling my rifle it is ni on round on round.without a barrel clean in at least 5 years,only had to re zero once when I fell and banged the scope.???

Atb

[charlie caller 3,654]

god some people talk rubbish dont they!!!

Golly gosh Rimmer you are a tease.

[rimmer 33]

Where's the crap advise in this thread? Apart from a bolt clean and oiling my rifle it is ni on round on round.without a barrel clean in at least 5 years,only had to re zero once when I fell and banged the scope.???

Atb

Its not the barrel cleaning thats the issue, you zero then clean your barrel and the first shot is an inch high and the second is on target does anyone seriously think that is caused by cleaning? an inch is a wee bit too much to then drop back down an inch after a single round is fired or "fouling round". seriously????/

[Coypu Hunter 486]

So, what's the explanation then, Obi-Wan?

[slipper 116]

Is it because the first shot is from a stone cold barrel and the second is from a slightly warmer barrel? I don't know whats causing it I'm just curious and eager to learn atb

[Coypu Hunter 486]

That could make a difference if it happened every session, I suppose, but it sounds like it only happens during the first session after he's cleaned the barrel.

[charlie caller 3,654]

Just shoot the damn thing, the foxes wont notice one bit

[rimmer 33]

The cold barrel theory has been kicking around for years but as to how true it is?. look at snipers no warm up or fouling shot?.

to change the poi because of cleaning? and inch sounds to much and for it to be high and not left or right??.

[hutchey 147]

Snipers measure temperature of barrel, bullets and ambient temp anyway!

[Coypu Hunter 486]

Logically, I would guess that less lead in the barrel = slightly less drag on the first round = slightly higher velocity = slightly higher trajectory, but not necessarily to left or right of zero.

 

Different barrel/ammo combinations will no doubt react in different ways, so some shooters may see a difference after a clean, where others might not.

 

I have to re-zero my .22LR after a clean, and I know other shooters of bigger calibres who need to fire fire a fouling round after a clean. Slipper also finds his first round through a clean barrel falls an inch above zero, so there's obviously something in it.

[rimmer 33]

Snipers measure temperature of barrel, bullets and ambient temp anyway!

Not in this mans army they dont!!! you been watching too many films bud.

[rimmer 33]

Logically, I would guess that less lead in the barrel = slightly less drag on the first round = slightly higher velocity = slightly higher trajectory, but not necessarily to left or right of zero.

 

Different barrel/ammo combinations will no doubt react in different ways, so some shooters may see a difference after a clean, where others might not.

 

I have to re-zero my .22LR after a clean, and I know other shooters of bigger calibres who need to fire fire a fouling round after a clean. Slipper also finds his first round through a clean barrel falls an inch above zero, so there's obviously something in it.

There is some merit to this but barrel fouling affects the rifling which affects the stabilisation (not sure i spelt that right lol) of the bullet which means it could go left right high or low. 22lr is a whole diff ball game from center fire. any road i dont think its the fouling issue it prob more like a shooter issue, not meaning to be rude to slipper but more problems come from the shooter than the rifle.

[slipper 116]

No thats fine fair comment and I agree

[rimmer 33]

Thank you for taking that as it was meant Slipper.

your first shot is the basis for the shots that follow, yes the barrel will warm up which will have an effect but not much, as the barrel warms more and more with the shots that follow the groups will open up. but the difference between the first shot and the second shot should be very small. usuing the sniper senario again, they will be shooting over 300 yrds so the further out you go the bigger the difference if you had a first shot an inch high at 100yrds can you imagine what that would equate to at out at 900yrds which is a bog standard range for snipers, in fact it,s a quailifing range for a head shot if memoury serves correct. they are aware of barrel heating but right from the first shot they dope as the yanks would say, for range and windage, no allowance for barrel temp at all. air temp is a given and not an issue that is allowed for in any more degree than summer and winter.

Basic principle is keep it simple.

 

Forgot to say, the millitary have a kink for cleaning weapons every given oppertunity so you will always commence from a clean barrel!

Edited February 4, 2014 by rimmer