MarauderAirRifle.com

[CO2man]

Anyone tuned their Mrod to use CO2? Please post details

[n0tzl]

Was about to ask the same question since I'm trying to tune my .177 mrod for CO2 at the moment, since you haven't received a reply in nearly a year I'm not hopeful for much help but what the heck I'll give it a try.

Since my shooting at the moment is confined to a 10m makeshift range in the house figured I would give CO2 a try, the hand pump is great exercise and all but it does get old fast when I want to shoot a bunch, I'm still mulling over options (& finances) for an SCBA or SCUBA tank setup but don't really need a lot of power at the moment.

Had the gun tuned pretty good for a 2100psi air fill using CPH pellets, that tune gave me 550fps with both heavy & light Crosman Premiers with a CO2 fill so I started over with both hammer spring & stroke backed all the way out & the transfer port 4 turns out - that gave me 630fps with either pellet but increasing the spring tension made the velocity drop so I started shortening the stroke, have it 4 turns in now but think it will need a couple of more before the velocity falls, no matter what I've tried so far it won't go above 630fps, premier light, heavy, Gamo match, 2 other pellets and all about the same velocity - the premier lights have the best groups.

I'm getting 1" or so 10 shot groups at these settings but using air I can get 1/4" groups out of this gun with CPH at this range if I keep it above about 780fps, the CPL group about 1/2". I love the consistency of the CO2 velocity but wonder if I'm doing something wrong - is 630fps all the faster it will drive a 7.9gr pellet with CO2?

Has anybody else played with CO2 in a .177 mrod? Would love to see some comments about how it works and what settings you used.

Thanks, Dan

[fredfable]

Was about to ask the same question since I'm trying to tune my .177 mrod for CO2 at the moment, since you haven't received a reply in nearly a year I'm not hopeful for much help but what the heck I'll give it a try.

Since my shooting at the moment is confined to a 10m makeshift range in the house figured I would give CO2 a try, the hand pump is great exercise and all but it does get old fast when I want to shoot a bunch, I'm still mulling over options (& finances) for an SCBA or SCUBA tank setup but don't really need a lot of power at the moment.

Had the gun tuned pretty good for a 2100psi air fill using CPH pellets, that tune gave me 550fps with both heavy & light Crosman Premiers with a CO2 fill so I started over with both hammer spring & stroke backed all the way out & the transfer port 4 turns out - that gave me 630fps with either pellet but increasing the spring tension made the velocity drop so I started shortening the stroke, have it 4 turns in now but think it will need a couple of more before the velocity falls, no matter what I've tried so far it won't go above 630fps, premier light, heavy, Gamo match, 2 other pellets and all about the same velocity - the premier lights have the best groups.

I'm getting 1" or so 10 shot groups at these settings but using air I can get 1/4" groups out of this gun with CPH at this range if I keep it above about 780fps, the CPL group about 1/2". I love the consistency of the CO2 velocity but wonder if I'm doing something wrong

- is 630fps all the faster it will drive a 7.9gr pellet with CO2?

Has anybody else played with CO2 in a .177 mrod? Would love to see some comments about how it works and what settings you used.

Thanks, Dan

Yes, Kinda...
A friend of mine is doing some test lately with a .22 Normally @ 10 meters. Very happy, great consistency,but...
in Argentina (that's where...) people is very friendly using "Mix"
Fill up to 60 Bars /870 pounds (or whatever you can fill) with CO2 and complete to 160 Bars/2300 pounds with air (your hand pump)
The mix gives you 100 extra foot/sec and an incredibly consistent and long string...
Is a different experience, as you see.
Greetings, Fred.

[Lammy1000]

Your velocity (550 fps) and consistently should make very tight groups...match rifles utilize this velocity and CO2 ruled the olympic type shooting. Try a match wadcutter pellet.

A "MIX", this sounds exciting. I'll have to see how other people did with this CO2 / pressurized air concept. Please keep us posted.