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 Post subject: speed verses accuracy
PostPosted: Tue May 06, 2014 5:23 pm 
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A new experiment for yall to try. I bought some Crossman HP,s today out of necessity, and they were $16 a tin at Wallyland. But they looked real nice, must have new machinery. Anyway So I was using them in my 22xx home made gun and at around 650 fps they were quite accurate at 50 yd,s. As good as the JSB,s. but when I turned the power down for more shots at 15 yd,s they were crap. So I did this experiment. The picture is self explanatory. I'll try other guns next chance I get.
Image

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PostPosted: Tue May 06, 2014 5:45 pm 
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What distance were these shots?


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PostPosted: Tue May 06, 2014 5:48 pm 
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Seems like maybe the British are onto something with the 12 ft/lb, seems like a pretty optimum number

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PostPosted: Tue May 06, 2014 5:49 pm 
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Watertown wrote:
What distance were these shots?

Good point. They were at 15 yds. At 50 yds they are more like the first group about 1.5 inches or less.

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PostPosted: Tue May 06, 2014 6:03 pm 
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mike87gt wrote:
Seems like maybe the British are onto something with the 12 ft/lb, seems like a pretty optimum number

I quite agree. At 650 fps a Crossman 14.3 gr pellet yield,s 13.4 foot pound,s energy. No problem poking holes in pellet tins at 50 yds. r squirrel,s for that matter.

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PostPosted: Tue May 06, 2014 6:36 pm 
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That's a pretty clear demonstration!


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PostPosted: Tue May 06, 2014 7:09 pm 
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EverHopeful wrote:
That's a pretty clear demonstration!

yes quite obvious the difference speed makes. However, I should point out that every gun is different. This shows my particular gun works best at 650 to 700 fps using Crossman HP, s. And not all guns have a power adjuster, so if yours is not adjustable and doesn, t shoot crossman pellet, s well, then you have to switch pellets. I have a partiall filled tin of .177 cphp and an unopened tin that I haven, t shot for over a year because they just didn't shoot well. However all my .177 guns except for 2 are sub 500 fps or just over. The other 2 were the ruger air hawke at 900 fps which I suspect was just too fast for cphp, s and the pneuma which I never tried below 900 fps. I certainly will next chance I get.

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PostPosted: Tue May 06, 2014 8:40 pm 
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Yeah, joe that is true of most projectiles! Spin and speed has a big factor in stability.

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PostPosted: Wed May 07, 2014 11:58 am 
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I'd be testing more around 570 as well as 675, Joe - appear to be 2 accuracy nodes. 5 groups at each setting will tell a more 'accurate' story.

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PostPosted: Wed May 07, 2014 1:13 pm 
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FMO of chucking lead over the years here is MHO.
.177 Wadcuters 6-8gr, 515-540fps Diablo 6-8gr, 560-570fps is a sweet spot.
.22 Diablos 14-16gr 680fps magic number for springers and Co2. HPA is pendant upon bbl length but that does vary gun to gun.
.25 Diablos 25-30gr 760-780fps has yeilded very nice accuracy.
.30 JSBs 910-930 pending bbl length and twist, again for HPA.
.35 JSB 820-860fps is a very nice range but pendant upon bbl length and twist, once again. No kind comments upon the Eujins here.

But like I said From My Observations. Lets see the opinions of others here.

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PostPosted: Wed May 07, 2014 1:24 pm 
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I would agree with Daryl.... take away that one flyer at 570 it's very impressive.... You need more groups to determine which is better.... If it turns out that it does shoot better at ~570 and ~675 and worse in between, then I would suggest that it is barrel harmonics, and not the pure velocity, that is the culprit.... Shooting at a small target and noting the POI relative to the POA may well show two groups that are tighter and you may even be able to separate out the vertical position of the barrel at both ends of its swing.... Relative small changes in velocity may show a large change in group size, and allow you to "hone in" on the best (or several good) velocity for a given pellet....

Bob

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PostPosted: Wed May 07, 2014 1:58 pm 
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A link from Bob's other post on kolbe's calculators which may apply:
http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/barrel_vibrations.htm


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PostPosted: Wed May 07, 2014 4:05 pm 
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Whitewolf wrote:
FMO of chucking lead over the years here is MHO.
.177 Wadcuters 6-8gr, 515-540fps Diablo 6-8gr, 560-570fps is a sweet spot.
.22 Diablos 14-16gr 680fps magic number for springers and Co2. HPA is pendant upon bbl length but that does vary gun to gun.
.25 Diablos 25-30gr 760-780fps has yeilded very nice accuracy.
.30 JSBs 910-930 pending bbl length and twist, again for HPA.
.35 JSB 820-860fps is a very nice range but pendant upon bbl length and twist, once again. No kind comments upon the Eujins here.

But like I said From My Observations. Lets see the opinions of others here.


Sent to the printer!

Thank YOU Kim!

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