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 Post subject: Pump Rifles
PostPosted: Fri Aug 17, 2018 5:12 pm 
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Joined: Fri Jun 08, 2007 8:45 pm
Posts: 758
Location: Toronto
I have a Crosman M4-177 with mostly quarter inch , 5 shot groups @ 25 feet. I also have an Umarex APX 490 which is not nearly as accurate at that distance. At 18 feet it is acceptable. So what factors with variable pumpers are to be considered: The movement of air? ,the rifling?, the barrel stability? or......?


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 Post subject: Re: Pump Rifles
PostPosted: Fri Aug 17, 2018 5:40 pm 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2543
Location: Winnipeg, Canada
Some of the M-4-177's got decently accurate bbls.

The M-4 platform it's self is not all that conducive to top notch accuracy. There's quite a bit of movement under the mostly nylon furniture generated by pumping. Crosman did make an honest effort at bbl retention with what they had to work with.

I mounted an M-4 bbl on a steel breeched 13-XX just to see what it would do, and the results were more than highly acceptable.

I think the umarex pumper has a smooth bore bbl...

-D.S.

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 Post subject: Re: Pump Rifles
PostPosted: Fri Aug 17, 2018 6:06 pm 
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Joined: Mon Jan 20, 2014 10:32 pm
Posts: 752
Location: Burlington ON
The Umarex has some reasonable reviews, have you tried enough pellets types?


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 Post subject: Re: Pump Rifles
PostPosted: Fri Aug 17, 2018 6:11 pm 
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Joined: Fri Jun 08, 2007 8:45 pm
Posts: 758
Location: Toronto
DDtank wrote:
The Umarex has some reasonable reviews, have you tried enough pellets types?

Yup , best for mine is JSB 8.44


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 Post subject: Re: Pump Rifles
PostPosted: Fri Aug 17, 2018 6:16 pm 
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Joined: Fri Jun 08, 2007 8:45 pm
Posts: 758
Location: Toronto
The Umarex is rifled. Mike ( Replica airguns) did a video a few years ago and the accuracy surprised him.
I do accept that barrel quality, therefore accuracy, can differ between same model airguns. Perhaps, the pumpers can also vary in same model in the air movement.


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 Post subject: Re: Pump Rifles
PostPosted: Sat Aug 18, 2018 3:57 am 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2543
Location: Winnipeg, Canada
I stand corrected on the apx/nxg. Had looked at one at cabela's with the store bore light, and couldn't see much.

The movement I mention on the the M-4 refers to mechanical movement. The bbl will move slightly with pumping. This is also true of the 13-XX series with the plastic breech. The steel breech is one of the major improvement mods for them...
It has the same shot to shot velocity consistency as a 760 (the parent platform) or a 13-XX, which ain't bad.

-D.S.

_________________
"Ain't no half-way"
-S.R.V.

Eye Protection!


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