Umarex .22 calibre 850 M2

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Posted: 11 Mar 2024 at 5:51am

Oooooo nice. I've always wanted to tinker with one of these.

mercs

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Posted: 11 Mar 2024 at 5:48am

Unit sent for inspection under warranty and nothing untoward identified. They returned it with sample 18 metre groupings in line with what I produce. With the warranty out of the way I will now do some work on lifting the 8ft/lb power output closer to 10ft/lb.

I have enjoyed many a summer evening plinking and getting very good results out to 28 yards with the reflex sight from standing position. Recently changed to JSB 13.73 grain wadcutters which appear to be performing well so i will also measure energy and group size at 20 and 25.

Umarex dressed up with Stealth Reflex sight which needed a dovetail to Picatinny adaptor. The extra height works well if I am walking about and making a relatively fast acquisition with the red dot. The M2 came with a cheek riser which also helps in this configuration.

The fitted Picatinny rail with Accu-Tech QD bipod. Not really better than a sandbag or fencepost but brings this in line with the .177 Hammerli.

Initial 13yard group after sight-in.

0.62 inch OD so falls short of its .177 companion.

mercs

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Posted: 31 Dec 2023 at 2:45pm

Test were through the Chronograph to ground so no POI reference.

I have not disturbed anything as still under warranty. Loading mechanism, safety and I suspect valve, operation were very firm when new but has freed up with use. Very difficult to get through a magazine of eight pellets without at least one abnormal flight.

Good point, I will have the unit serviced and valve checked before warranty ends in April.

cheers

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Posted: 31 Dec 2023 at 3:18am

Interesting. Did you notice poi change with shot 1 and 6? It's not a big change in speed.

Have you opened the gun up to check the hammer or valve system? A slightly sticky hammer from a rough factory edge can certainly have a bearing on pellet speed, especially with the lower velocity for .22.

mercs

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Posted: 30 Dec 2023 at 10:00am

8 months with the M2 with mixed results, it has never became the reliable target rifle at 25 yards as hoped. I get good results at 15 - 20 yards but cannot turn that into a credible score at club distances.

Being sub 10 ft/lbs the .22 version just does not perform like the Hammerli .177 850.

The same CO2 power applied to the cross section of .22 calibre is potentially more effective but clearly loses out at a distance.

Following a careful barrel clean using BoreTech products, this eight shot spread through the chronograph still had disappointing fps on shot 1 and 6 which would have let me down at the targets. I was careful to space the shots out to avoid any chilling effect from the CO2.

Umarex	JSB
850 M2	RS
1	564
2	551
3	555
4	553
5	555
6	541
7	553
8	555

M2 has been dressed up with a side focus ZeroTech 3-12x40 and as long as I stay within 20 yards I get decent results.

H&N FTT 14.66 grain with a 5.54 head size.

Good result but pellets are quite tight when loading.

Edited by mercs - 30 Dec 2023 at 10:04am

mercs

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Posted: 23 Jul 2023 at 2:08pm

No, they are one time use, so at $30 each are convenient but not very economical options.

There are adaptors designed for refillable paintball type bottles.

Umarex make a 2 x 12 gramme cartridge adaptor which I would definitely use if available in NZ.

The 12 gramme are more often on special for larger orders and the device actually seals allowing it to be removed from rifle and refitted when charged with gas.

Edited by mercs - 23 Jul 2023 at 2:10pm

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Posted: 21 Jul 2023 at 3:33pm

Hi Mercs,
Are those big 88gr canisters re-fillable?
Pete.

Walk quietly, but carry a big stick.

mercs

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Posted: 17 May 2023 at 3:51pm

30 metres bench rest off shooting bags to hopefully tighten up on results to no avail.

Struggling in cooler outdoor conditions and my .177 definitely out performs the .22.

Will persevere and perhaps need to try some heavier or different head size pellets.

30 metres .22 Umarex 850 with Sig Venom pellets and Zero Tech scope. 77mm OD

30 metres .177 Hammerli with RWS Super Field pellets and Tasco scope. 33mm OD

Edited by mercs - 17 May 2023 at 3:52pm

mercs

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Posted: 09 May 2023 at 2:51pm

Shots per CO2 bottle, count was over 130 when I changed the bottle as it started to drop off however it must have been cooler weather as quite some CO2 remained to be discharged. Stated count is 150 pellets and no reason to doubt that in the summer.

Struggling to get consistency out at 25 yards and beyond with the RWS or JSB.

Mechanism seems to be more affected by cooling effect after multiple shoots than previously experienced. I tend to buy up CO2 bottles in winter for summer use so perhaps I am expecting a bit much for this time of year.

Working with Crosman Premiere pellets currently.

I remain hopeful of using this rifle at outdoor 30 metre sub 12 ft/lb club competition but currently I would be better with my .177 Hammerli 850.

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