Over sized. 25 pellets for loose bore .25 airgun?

[King_mayham]

I have a hatsan 125 with a over sized bore. It's wide enough where it's effecting velocity. What are some .25 pellets that have a wider diameter skirt? So I can maximize accuracy and power. And would .25 airgun slugs seal the barrel up more? If you got any suggestions I would like to hear them. It's a accurate gun but I feel if I had a better sealing pellet it'd probably be more accurate? About a inch to 2 inch grouping at 30 yards, give or take some days it's fussier than others.

[Blowpipe Sam]

.25 slugs probably won’t work real well in a mod 125.  They didn’t work in my .22 caliber mod 125.  Try softer, pure lead pellets.  The skirts of soft lead pellets expand to obdurate better than hard lead pellets.  Good quality pellets from H&N or JSB will have the head size indicated.  If you think your bore is oversized try to find the largest head size .25 caliber pellet you can.  Skirt size will conform to head size.  A pellet shot through a properly sized bore should have slight engraving on the head of the pellet and deeper engraving on the skirts due to their expansion.

[Mr.P]

There are some very light H and N pellets (~20grain) that have relatively thin skirts and reasonably soft lead which might really balloon from air pressure and expand to seal up against the barrel.  That's how it's supposed to work at least.

[mikeyb]

This image shows how a standard size 22 pellet shot from a springer can expand to fit a bore.



I capture SHOT pellets in a tube of wadded up HDPE plastic shopping bags. The capture deformation is very small so pellets captured this way can provide some interesting data.

I have a loose bore Mod95-25 and its accuracy limit is ME = the shooter. Pellets from THAT rifle show skirt expansion (not as much as above) and solid clean rifling marks in the expanded skirt.

1" groups at 30 yards? IMO that is VERY GOOD for a Hatsan Magnum Springer like the Mod125. The 2" groups may NOT be the rifle. Shooting ANY springer (doesn't matter what kind of spring) with precision is a hard-learned-skill which takes lots of practice and attention to even the smallest details of the hold, trigger-pull, AND follow-through. The smallest "shooter" change from one shot to the next will open up a group.
I think you may be expecting too much from a Hatsan Mod125 rifle, even one that is well tuned.

[Tater]

Moved to the Hatsan Gate.