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I appreciate the information. I guess the round fitment is really, just trial and error. Did you track exact diameters in order to find the right round fitment vs how they left the barrel?
I will order some of the slugs from NSA. I am actively searching for the heaviest slug that has been used with great accuracy. Of course, that does not mean that my exact rifle will perform perfect, nor the loose nut behind the wheel.
Thank you.
Yes it is a lot of trial and error but if you look around on this forum or anywhere else I'm sure someone will have some suggestions for sizes for the .25 cal
No I didn't measure the slugs myself, just ordered from NSA and shot each size and recorded the results on the target. The target was 10 shot groups at 30 yards. Lots say do 5 shot but 10 really shows you what really happens. Plus like for 20.2 .216 I jerked one so having 9 in the "real group" is better than just 4 if I only did a 5 shot group.
Heavy means you need more air to fire it at a good enough speed to stabilize. Also know that since the slug contacts the rifling pretty much the whole length vs a pellet which only touches at the head and skirt, the slugs naturally shoot slower than pellets to begin with. I shoot the 18.13 gr JSB pellet and 17.5 gr .2165 gr NSA slug about the same speed, for reference.
I'm not saying don't try for heaviest slug I'm just saying you'll need more air to get it to go fast enough to stabilize if it is heavy for caliber.
To my knowledge, NSA does not have a sampler pack (Sizes and weights) so I have had to purchase slugs in each size and weight and test them out.
Oh! I have something to add for "what do you wish you did when starting with pcp" I definitely recommend you get a chronograph. You cannot tune your airgun well without it. You can get ballpark by seeing what your target looks like after the group gets shot but you may be using more air than needed or something else may be out of balance. You want the hammer and regulator pressure in harmony, and it's been recommended here that you shoot the highest hammer spring setting at the regulator setting you're at, then get an average, and then tune back down to 95-97% of that peak fps to get to an economical tune where you are using the perfect amount of air to get fastest speed for the settings.
utahairguns.com 
