RWS 48 .177 or .22

In my opinion the 48/52 power plant is more effiecient in .22 cal where the power availible is better transfered into energy. .177 cal is ok but might be a little bit harsher on the firing cycle with all that power trying to push that smaller pellet. If you looking for power for pest control go with .22 but if precision long range target shooting is your preference then the .177 cal might be a better choice, however a tune forvthe 177 cal will be needed to smooth out the firing cycle. My two cents and I am sticking with it....lol
 
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You see a lot of these in .177 (at least in Europe) cause that is the default cal for springuns, but almost everybody knowledgable agrees the D48/52 behave better and shoot better in .22

I would look for an 52 instead of a 48. Better looking, better feeling, better ergos. Just be bit patient finding one as they are no longer produced…
 
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My setup with ARH Grt spring. Accuracy very good. Pest starlings@ 75 yds. 
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Either caliber is good as you can see from above. Decide which you prefer. 10.3 gr pellets are good if you go .177. It’s a beast of a gun, heavy and a little hard to cock. Not for everyone, but some of us find out we really like it.

Edit: There are also 3 trigger variations when you go looking. T01 on older guns is a nice trigger and very adjustable. But harder to remove for replacing spring etc. T05 isn’t a terrible trigger but has very little built in adjustment. T06 is the newest trigger. Similar adjustability to the T01 but easier to work on the gun. All of these triggers work fine, but in case you have a choice there ya go.
 
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I own a 52 / T01 trigger in .22 cal. Very accurate & smooth firing cycle. This rifle & a second 52 where purchased used. One from a local gun shop & 1 from Gunbroker. The last purchase came with a BSA scope & was $300.00. These are excellent, well made rifles & at the $300.00 price point a real value. If my current rifle wasn’t such a good shooter as is I would have it tuned.
 
I have a D48T06 in .22 with the Diana zero recoil scope mount, highly recommended to absorb some of the scope weight in the recoil and to protect your scope. This is a beast of a gun. Heavy, especially with large scope. I also find it to be a tack driver off the bench up to 50-60 yards or off hand standing up to 40 yards using the artillery hold. The rifle is extremely hold sensitive and drops critters fast. Every barrel likes a different pellet for certain distances. I find the JSB exact 15.89g works best with my barrel.

I joined the 100+ yard club with this gun, shooting off a bench. Let's says the rabbit had a better day than I did. Amazing power transfer to target at such a long distance. I've tried slugs, 25g or bigger, and find them effective at 30-40 yards but then they loose their accuracy because slugs are like lobing mortar rounds due to their weight unless you are shooting PCP, then slug groups tighten.

 
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