Paralax Problems ?

[Cedric 132]

I've been really struggling with my HW99S, trying to get decent groups. I've polished the internals and have the trigger sweet but I can't seem to get the groups I expect.

 

Trying different brand pellets obviously gives differing performance but still nowhere near what I think the rifle is capable of.

 

Been through all the obvious things - trigger technique, hold etc. and think I have narrowed it down to my scope use. I'm having trouble with paralax at short ranges (25 yards). Resting the rifle on sandbags when I move my head the cross hairs move over the target.

 

Could i be right in thinking that keeping my cheek against the stock in exactly the same posion would help. There is no high cheek piece on the stock and it sits half way between my jaw and cheekbone, indeed if I clench my jaw the reticule moves!

 

Then it occured to me that whilst lining up on the bull I might be unconsciously moving my head to put the cross hairs on target - think this is feasable, getting into a bad habit ?

 

Has anyone got any bright ideas for fitting a raised cheel piece or making/ moulding one ?

[Skot Ruthless Teale 1,701]

Should be pellet on pellet at 25 yards!

 

I know what you mean about moving your eye to get the cross on the bull, i was guilty of that-it is a very bad habit indeed.

 

Has your scope got Adjustable objective or side focus .. or is it set paralax ?

 

if its paralax adjustible zoom right in and make sure you focus so its perfectly crystal clear.

 

mine says its at about 45-50 yards on the scope itself. but really thats when i set it for 34 yards!

[barrywhite 282]

put this on the end of your scope .A piece of paper with a hole in it .

[Cedric 132]

Numb question - which end ?

 

The scope in question is a Hawke Sport HD 3-9 x 40, it's adjustable focus but having ancient eyes I can never get the reticule and target in perfect focus, I usually try and get the reticule sharp - plus I normally wear glasses for shooting, not so much for looking through the scope ( because I can adjust for that without specs) but so I can actually see when I lift my head.

 

I don't seem to have the same trouble with my .22 and .17hmr but I use those at longer ranges ( they also have better quality scopes) and both rifles have padded cheek piece raisers.

[SimonC_Here 36]

That's the objective end (not the one you look into)

 

Is your scope the one with the Adjustable objective? If it's not, you can still adjust the focus by unscrewing the objective end of the scope tube and then twisting the lens until the target is in focus.

 

That's exactly the same set up as I've got on mine and I had to reduce the focus from somewhere around 60 yards to a much closer 25 yards.

[Skot Ruthless Teale 1,701]

I heard most non-AO/SF scopes are set at 100 yards.. whats the point in that lol

 

More effort adjusting them but deffo needs doing

[PJWmids 35]

Try using a Accucover scope flip cover.

[barrywhite 282]

the front lense not the one you look through .even if you have a/o on the scope it still helps .If you have big magnification and no way to lessen it .experiment with hole size .you need a compass ,scissors piece of paper and a elastic band .

[Cedric 132]

Barry - how does it work? It was nearly dark before it stopped raining here so didn't really get a chance to try it, popped a bit of tin foil over the scope and poked a hole in to see if i could still see through it. Will try again in the morning. I have some flip-up lense covers and can cut some bits of card that fit inside, that will hold them in place. I'll make a selection with differing holes.

 

I also tried making a comb raiser, carved some water pipe insulation until it fitted my cheek but I did it standing, when I lean over the truck bonnet it's in the wrong place - again- something else for tomorrow.

 

SimonC - no it doesn't have the Adjustable objective. I haven't tried unscrewing it yet. Does the end just come off and let you get at the lense?

 

PJ - I've looked up the Accucover, seems quite interesting, might give it a go. However the scopes I'm using have the focal adjustment ring on the eyepiece, that might prove to be a problem if I have to rotate them.

[SimonC_Here 36]

Barry - how does it work? It was nearly dark before it stopped raining here so didn't really get a chance to try it, popped a bit of tin foil over the scope and poked a hole in to see if i could still see through it. Will try again in the morning. I have some flip-up lense covers and can cut some bits of card that fit inside, that will hold them in place. I'll make a selection with differing holes.

 

I also tried making a comb raiser, carved some water pipe insulation until it fitted my cheek but I did it standing, when I lean over the truck bonnet it's in the wrong place - again- something else for tomorrow.

 

SimonC - no it doesn't have the Adjustable objective. I haven't tried unscrewing it yet. Does the end just come off and let you get at the lense?

 

PJ - I've looked up the Accucover, seems quite interesting, might give it a go. However the scopes I'm using have the focal adjustment ring on the eyepiece, that might prove to be a problem if I have to rotate them.

 

Google pin hole cameras, I believe it's the same principle.

 

If you look at the end of the scope the bit with the white writing on it unscrews. When taken off you will see the lens in it's carrier and you just twist that to change the focus.

[barrywhite 282]

Barry - how does it work? It was nearly dark before it stopped raining here so didn't really get a chance to try it, popped a bit of tin foil over the scope and poked a hole in to see if i could still see through it. Will try again in the morning. I have some flip-up lense covers and can cut some bits of card that fit inside, that will hold them in place. I'll make a selection with differing holes.

 

I also tried making a comb raiser, carved some water pipe insulation until it fitted my cheek but I did it standing, when I lean over the truck bonnet it's in the wrong place - again- something else for tomorrow.

 

SimonC - no it doesn't have the Adjustable objective. I haven't tried unscrewing it yet. Does the end just come off and let you get at the lense?

 

PJ - I've looked up the Accucover, seems quite interesting, might give it a go. However the scopes I'm using have the focal adjustment ring on the eyepiece, that might prove to be a problem if I have to rotate them.

[barrywhite 282]

Barry - how does it work? It was nearly dark before it stopped raining here so didn't really get a chance to try it, popped a bit of tin foil over the scope and poked a hole in to see if i could still see through it. Will try again in the morning. I have some flip-up lense covers and can cut some bits of card that fit inside, that will hold them in place. I'll make a selection with differing holes.

 

I also tried making a comb raiser, carved some water pipe insulation until it fitted my cheek but I did it standing, when I lean over the truck bonnet it's in the wrong place - again- something else for tomorrow.

 

SimonC - no it doesn't have the Adjustable objective. I haven't tried unscrewing it yet. Does the end just come off and let you get at the lense?

 

PJ - I've looked up the Accucover, seems quite interesting, might give it a go. However the scopes I'm using have the focal adjustment ring on the eyepiece, that might prove to be a problem if I have to rotate them.

make the things as accurate as possible .If you rotate them and the center of the hole moves your impact point may move .

[Cedric 132]

A little progress !

 

SimonC - unscrewed it and the lense was not separate, came off with the end piece. However I turned it out slightly and the target came into focus at 30 yards, popped a bit of tape round it to hold it in place as a temporary measure.

 

Barry - I have some hole punches that will do the job, I'll try it later this week.

 

I read up and watched some vids about parallax, I had been using the eye piece focus ring to try and get the target and reticule into focus - didn't work. So I concentrated on the reticule and altered the focus at the objective end.

Then I made a cheek piece to try and obtain a consistant posistion, seems to have worked. I used water pipe insulation, taped on for now, if it's OK I will cover it in neoprene.

 

I tried six different types of pellet with varying results - all at the same aim point !

[SimonC_Here 36]

^{You unscrewed a bit too much!}

 

The outer ring comes off first then the spacer with the writing on it. The lens should stay in the scope body and this is what you adjust.

 

When ready, put it all back together and the outer ring locks in all in place.

Edited June 11, 2014 by SimonC_Here

[Cedric 132]

Thanks Simon, I got it sussed out. The end ring was that tight it brought the entire lense unit out with it. I managed to get the end ring unscrewed then, the threads were very bunged up with Locktite or something, cleaned it off and with a bit of fiddling it seemed to work.

 

I re-focused for about 30 yards and it's much better, both the reticule and target in good focus.

 

Groups seem to have tightened by about 50% but it's very pellet fussy - I'll keep at it.