HW30 with Hawke scope

Is you group just opening vertically? If so I'm trying to figure what would cause only a vertical shift. If the reticle was loose in the scope it would be happening from the get go not after 15 shots. If the scope is loose it's not going to take 15 shots either. Have you cleaned the barrel? I've had guns that needed a number of rounds thru them to settle down after cleaning. Also had guns (rim fires) that took a goodly number of rounds to settle in when changing ammo.

Maybe a little more information is needed. Does this happen consistently with both pellets and have you been changing from one pellet to the other while shooting.

Couple thoughts. After ten or fifteen maybe you're tiring or not being careful about placing the rifle exactly the same on the rest. Springers are funny about rests. I can't shoot them nearly as accurately as PCP or other types of guns. But I can't say that I've ever noticed a deterioration related to shot count.

Have some one else shoot your gun is my best advice. Eliminate as many variables as possible. It this point I'd tend to think it's related to the shooter (something you are doing) until proven other wise.

If it's the gun or scope it will be interesting to learn what it might be. Can't say the barrel is getting hot can we??? Maybe?? Only thing I can think that would be shot number related. Pellets lubed?

Accidental double post

I had this problem with adjustable rings, but on a 97 and not a 30. The recoil, no matter how tight I locked down the set screws, were still pushing the scope upwards on the front ring, thus dropping my POI lower and lower ever so slowly.

Some 30’s have an intermittent fault where at times the cocking lever catches on the underside of the breech “block” which doesn’t allow the breech to fully close. This misalignment with the exhaust port results in poor accuracy. 

What type of rest do you use? Is it a soft one that "weakens" after some shots making the gun sink down and therefore you start shooting in an different angle? Have you tuned it with some aftermarket spring like vortek? I did so in mine and the accurasy was gone, struggle a lot until i changed back to the original and problem was gone...

Some 30’s have an intermittent fault where at times the cocking lever catches on the underside of the breech “block” which doesn’t allow the breech to fully close. This misalignment with the exhaust port results in poor accuracy.

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That's interesting but it doesn't explain why after 15 shots. Wouldn't it be completely random if that was the cause ?

As said above, if you’re going from top to bottom of the target, then you’re modifying your angle, thus resulting in a different POI. If you go left to right, or visa-versa, you shouldn’t see the drop (typically). If you start at the top of the page and start shooting downwards, lowering the front support of the rifle stock as you go, you’ll see gradual drops in your POI.

Especially in a low FPS rifle such as the HW30.

I notice drops in POI at only 20 yards when moving from top to bottom of a 12 vertical target. A complete resight is required, even when I only adjust my vertical target location 2 or 3 inches.