Slugs are all I shoot outta my .25. I have 2 tins of JSB Mk 2 heavy, and yes, under 50 yards they are more accurate than slugs and will group tighter. The 2021 model .25 is particularly accurate with these and will stack ‘em at 50 yds, even at 1,000 FPS. I might have shot 3 mags of them total.
However, you can shoot slugs pretty hot outta this rifle, and mine groups the NSA dish base 26.8 grain hollow points just over a half inch at my 51 yard target, at various settings from 1020 to 1080 FPS. Owning the Impact .25 with slug liner and shooting the NSA Flat Base 29.5 grain hollow points with stellar accuracy has ruined me for pellets. I always stretch out my efforts past 50 yards, but even at 50, you can notice a difference in how slugs hit harder on target. Pellets slow down that fast!
I had actually ordered mine in .22 at first because of the super high BC .22LR type slugs it’s known to shoot, but the haunting thought of how much harder a .25 hits on target changed my mind, and I delayed my shipping a day by changing my mind, but received a courteous and prompt caliber change and Ares Tactical airguns had the .25 coming the next morning!
Many of the NSAs through the whole range will hold under an inch at 50 yards, and up close, the MK 2s do the job real well. You may find another weight NSA does better in your barrel, but around that 1,000 FPS mark, quite a few Slugs do pretty good. The 26.8’s I use will consistently ding a 12” steel at 217 yards at my house. These ranges are where slugs are King! AVOID the Huben style 46 grain round nose slugs that look like the .22 LR type ones the .22 is famous for. Only round that ever jammed mine up. I had to tap the mag with a wood block and hammer to break it free. I have thought twice about not going with that .22, but I think it would ONLY profit shooting high SD, long and heavy, like; 36 to 40 grain slugs over 150 yards.
A mandatory treatment polishing the bore with JBs non embedding bore cleaner, but that’s all my rifles. You’ll tighten your groups by using it. I put the rod on the electric drill and spin it while slowly moving up and down the bore. Be sure to use oil to get all of that out, and just stay an inch or more away from the magazine!
You’ll love either one. Very hardy and forgiving platform to be so complex.
Order it, homie!!