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domer_pyle · Senior Member

After tempering my hammer spring it looks like I've gained a couple fps overall. Finally got the chrony to work so here's a string, starting at 2400 psi:

827
823
819
819
819
831-2200 psi
802
835
835
831
840
857
853
857
857-2000 psi
862
871
878
878
876
853
885
871
885
890
881
876
876-1500 psi
871
871
846
848
835- can't remember what this ended at

That's where I stopped because the power loss was becoming apparent. 16 shots on a fill is fine for me (I only shoot til it comes back down to the starting velocity) and is easily a day of hunting, assuming there are more squirrels than chipmunks of course!

Interesting that from the 8th shot to the last it's a 55 fps spread, that means off of just under a 2200 psi fill you could probably get at least 30 useable shots! Not bad for plinking.

Over the 16 shots I'd use the average is 873.81 fps. Can't wait to see what happens with the Trakar spring and an RVA!

oops, forgot to add a couple things

packrat · Senior Member

Justt keep in mind that if you wish to keep usable shots to within 5% of max, then the first 11 shots are under the minimum of 845fps...I only mention this because at longer distances this could give you an unacceptable POI- but- like you said...not bad for plinking Mr. Green

Overall the Disco is just a great airgun,,,very accurate, dual-fuel, lightweight and reasonably priced !

domer_pyle · Senior Member

With the stock spring I only fill it to just under 2000 and use those 15-16 shots, I guess I must have got a fluke pellet that first time cause this shot string started much lower than it seemed it would. Not sure when that new spring will get here but my RVA should be here very soon. I'll be sure to post a pic of the rifle in it's new furniture in the next week or 2 as well!