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All my fills when testing .510 barrel were around 4300 psi.

I haven't shot my .457 barrel over chrony yet. My .510 barrel was shooting 400 plus with cf bottle and original tank. Fpe was about the same. For my gun it did not restrict any air flow. We currently have a foot of snow and hope to do some testing when the wheather clears.

I have the 22" barrel

Haven't had a chance to run it across the chrony. I would guess first shot at least 400 fpe. I hope to test it soon as the whaether gets better.

Here's a 6 shot group sight in at 50 yards. Pro slug 195 LH FD swagged. 3 shots to bottom was sighting in.

IN

If you buy same caliber barrel you just have to change barrel. Pretty easy!

Just shot the .457 at 30 yards and I like it much better so far. The pro slugs(205gr) on the left did the best. Mr HP 216 grains on top were a close second. AEA 243 grain came in third.

It was pretty easy. You have to take the stock off. There is a little Allen head screw in the back if bolt you back off some to pull bolt handle off. There is a small screw on side of bolt you take off. Not to bad.

I switched out barrels and bolt on my hp max. I'll post on the results with .457 soon.

I have one I bought in .510. I installed the 22 inch barrel on it. Accuracy was ok but not good past 50 yards. I was getting 400 plus fpe on first shot. Averaged 368 for 6 shots with 700cc cf bottle. Just bought the .457 barrel in .22 Inch. There is way more ammo selections in .457. I hoping I...

I want one! Would make a great little micro hunter.

NSA Gamo magnum .22cal g3 Pro slugs .510 cal AEA hp max Mr HP .45 cal SY 909 light hunter Fx Hybrids .30 cal AEA hp max

How's your accuracy? I have the .510 with .22" barrel and a 700cc cf bottle. I have the 500cc tank and the regulator. The best combo is the 700cc cf. My accuracy is good out to about 35 yards. Past that it's unpredictable. I really wanted to hunt with it out to at least 70yards. I'm not...

I shot my gamo magnum g3 .22cal over the weekend. I had some nsa 17.5 slugs in .2165 laying around. Just for giggles I slung some down range at 25yards. Man I was surprised. Ten shots were all stacked. I will definitely take this setup hunting.

I'm getting 412 fpe with first shot and a average of 330 fpe over a 6 shot mag. First two was left then moved scope for three more. This is what I'm looking for out of this gun. Did nothing other than put the barrel back on and tried it again. Only thing I can think of is I was maybe to close to...

Accuracy is way better. The 2 to the right i was holding down the front of gun. I started to hold tight against my shoulder it settled in.

Just emailed him. I bought my gun and 22 inch barrel off him. He is shooting a demo with 22 inch to what he is getting.

I just put the small barrel back on with is @ 13 inches. Haven't tested accuracy but my first shot was 311 fpe and average 265 fpe through 6 ahots. 260 grain slugs 735 fps!. I'm guessing that my 22 inch barrel is junk.