850 airmagnum HPA or Crosman AS2250XT HPA?

Hi, I’m looking at either the 850 airmagnum or the Crosman AS2250XT to run on HPA.

The 850 would just need to be converted to HPA

The AS2250XT would need converting to HPA, and then a 10 shot breech.

Which would be better in the long run for .177 at 12FPE?

I am also left handed if that makes any difference but I wouldn’t mind too much a right hand bolt.

Dave