Umarex .22 calibre 850 M2

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   Summer conditions test of M2 CO2 usage with Walther 12 gramme cartridge adaptor ($200)
60 shots without any discernible change in performance.
I was surprised at the high shot count so immediately repeated the test with same result.
Warm afternoon at 23 degrees Celcius.

These were my preferred genuine Crosman capsules at $2.50 each. 
Prices range from $2 - $3 and bulk purchase can reduce costs.
 Walther adapter with US 1 cent coin between the capsules ensures an effective pierce of both ends.

Adaptor is valved so can be pressurised and then safely inserted or removed from rifle.

Edited by mercs - 09 Feb 2025 at 10:43am

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mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 09 Feb 2025 at 10:12am
	Summer conditions test of M2 CO2 usage with Walther 12 gramme cartridge adaptor ($200) 60 shots without any discernible change in performance. I was surprised at the high shot count so immediately repeated the test with same result. Warm afternoon at 23 degrees Celcius. These were my preferred genuine Crosman capsules at $2.50 each. Prices range from $2 - $3 and bulk purchase can reduce costs. Walther adapter with US 1 cent coin between the capsules ensures an effective pierce of both ends. Adaptor is valved so can be pressurised and then safely inserted or removed from rifle. Edited by mercs - 09 Feb 2025 at 10:43am

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 09 Feb 2025 at 10:30am
	Accuracy follow up. I continued to have "fliers" despite numerous changes to the rifle, pellets and technique. Not using the bipod mounted on fore-stock picatinny rail was last piece of puzzle to prevent “fliers”. Any forward pressure from bipod transfers to the barrel. I have checked the barrel fit and mechanism and there is nothing loose so I believe the barrel deflects. I do not notice this with my almost identical Hammerli .177 which has a bipod retro fitted. There will be a difference in barrel cross section and subsequent strength. Hammerli Barrel OD 15.1mm ID 4.5mm Umarex Barrel OD 14.9mm ID 5.5mm The OD difference was unexpected. Invites a future comparison strength test with some weights and dial gauges.