Hol
Just cock the bolt, and don't pump the charging handle.
I do that all the time w my 953.
Also w/o charging the air, it also makes it quieter to dry fire, which makes it a LOT easier to concentrate on your trigger finger and follow through.
BTW did you do the trigger "fixes"? The stock 953 trigger is going to hurt your scores, it is gritty and heavy. The trigger fixes are NRA/CMP/4H legal, so you don't have to worry about that. Go to the CMP site, and order a booklet by "Tom Johnson" I think it is either $1.50 or $3. It is written for the 853, but essentially the only difference between the 853 and 953 is the stock, so almost everything in that booklet will apply to you. I've been talking about that book enough that I need to go find mine.