I hit point of aim at 10, 15, 20 yards, but at 25 and beyond my arrow strikes way left. Is this a tuning problem?

A couple of questions
1) What type of bow (Compound, Recurve) and sights? Are you using a peep?
2) When was the last time you shot a bare shaft through paper?
3) Fingers or release?
4) are the sight pins even out to 20 yards in the vertical? (By this I mean are all 3 pins the same distance from in the sight? Can you set a ruler straight against all 3 pins?)
5) Have you changed anything recently? Different arrows, new rest, ect.

It's a High Country Sniper, compound bow. I use a mechanical release with a peep sight. When I 1st bought it, I spent an afternoon with a hunting buddy that was a expert 3d shooter. He made all the adjustments for me. It shot perfect, I was accurate to 40 yds, after shooting it for 5 years, I had it restrung last year. It has never been the same since then. I know it must be a tuning problem.

How far is it moving to the left? Objects in flight take a straight line of travel. Sight in vertically at a longer distance, say 30 or 40 yards and then check it at 10 and 20. The diference at 10 yards is so small that you may not be noticing it being off at a distance that close. Is it with broadheads or field points? Broadheads may be plaining.

I would go to your local pro shop and have it papertuned and then try resighting it in afterwards. That will take care of 90% of the problems that could be occuring during the shot.

You said you had it restrung last year. It needs to be retuned as the string length will have changed as will the peep placement. Also as the string will streach over the first month or so, if it was adjusted when you got it back, as you broke the new string in it dropped tune.

Take it to a proshop and have it retuned and see what happens from there.

Probably a tuning problem due to the string change. Like amosgreg mentions, you might have to re-adjust your knocking point. But it could be any number of things.

The string brushing your arm or heavier clothing as it travels forward will also toss your arrow at greater distances.

Sounds like you are canting the bow.

Major-

I do all my own work on my bows, but I learned it through years of reading, experience and making mistakes.

Find a competent archery 'pro-shop' that's willing to explain the what each part of the tuning process does to arrow flight. I'm talking about rest position (left/right, up/down), rest spring tension (if applicable), vane clearance, nock position on the string, peep position, effects of under/overspined arrows and your anchor point and grip.

If it's a good shop/instructor, it'll be money well spent.

Once your happy with the shooting, record all of the measurements on you bow so that you're next string replacement is a piece of cake. Good luck.

Thanks guys, I guess I need to find another Pro Shop, the one that restrung my bow seemed like all the wanted to do was sell a $1000 Matthews.

Could wind have been a factor?

Guys, it's the string change. Any slight difference in length, no. of strands or material will knock the bow out of tune. It may be as simple as adjusting the bow weight. Shooting left sounds like the bow needs to be turned up a pound or so. Try one flat on the allen head.

I was thinking the same thing, only I was thinking the poundage might be set a little too high, causing the spine to bend.

So if going a flat or two up doesn't work, try going the other way! <G>

If you are right handed....like JLK says you are slightly canting your bow this will cause POI to be to the left of where you are holding your pin and more pronounced at longer ranges