I find when testing stuff Jim I wear a thin fingerless glove that I use on the bike - helps a tad .... even so - a session of even less than 100 rounds does let you know you've been shooting!
I am not up at the 500 mark yet but am still at around the 300, perfectly confident in the pup .. stoked with the 124 GD's too right now. I have been mostly using the gun to check out various ammo and not putting as much ''recreational'' rounds thru as perhaps I'd like - because this is my #1 and I'd rather keep it lower milage ..... #2 will then take over duty for larger thruput.
I do tho consider it is broken in ... and probably was even after 50 rounds!!