Hunting Washington Forum
Other Hunting => Coyote, Small Game, Varmints => Topic started by: trotterlg on March 11, 2010, 03:24:05 PM
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Finished off my ultimate Coyote getter yesterday, even put some rounds down range. Steyr M-95 action chambered in 20-06. Remington 204 Ruger takeoff barrel. 60gr of H-1000 CCI LR Mag primers and 34gr Dogtown bullet. This has a little zip to it. Haven't run it across the Chrono yet, next trip out I will try. Larry
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fwww.22-250.com%2F20-06_04.jpg&hash=06d21177273ad20941dabdc426ea4d78f27baac6)
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fwww.22-250.com%2F20-06_02.jpg&hash=74d7dd02ac86959bf89c95fa94d4d753b978fe68)
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Is this your own wild cat? What's Saami spec? Cup? PSI? What velocity do you think you'll be able to get with that?
-Steve
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Far as I know it is the only one. I don't know the velocity, depends whether I run it to 30-06 pressures or to 25-06 pressures. I made the cases from 25-06 brass, one pass through the sizer and it is done. Larry
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Nice looking yote gun! 8) What kind of groups are you getting?
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Holy Cow. :yike:
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P.O. Ackley had a 22-06 back in the 1930's and it seemed to be overbored. Interesting to see what velocities you get out ot it.
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I haven't shot for a group yet, yesterday I just sand bagged it in and pulled the trigger with a string. Put 7 rounds through it and it seems fine the primers aren't really too flat, so I may move the load up some. Left case is 60gr h1000 and the right is 57gr of H1000. Looks good to me. Larry
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fwww.22-250.com%2F20-06_03.jpg&hash=0b7f98e3a8702aecb0d31eb72dafc0070b7b8e8d)
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Anybody care to take a guess at velocity? I say over 5500fps if the bullet can hold together? What twist is it?
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i'd say 3900 fps
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Ah man! You beat me to it! I'll say 3800fps. I was thinking about a 20 WSSM for my next project, short, fat powder column...
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At 49,000 psi 3,900 is predicted, at 60,000psi 4,400+, but the calculators aren't very accurate when dealing with extreme case sizes. I may try running some 40gr bullets through it, that may be a little more to it's liking. I will let you know, I could go to some faster powder, but I started slow just to be safe. Larry
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Wow I was way off. I thought it would compete with the .22-243 Middlestead @ 5278 fps? Cool project though. :)
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I'd say definately over 4k.
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The velocity just really isn't reliably predictable, you just need to measure what you get. I will have some numbers in a while, but it is impressive when it fires. Larry
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Yes please keep us posted.
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Just as a frame of reference. My Swift will throw a 40 grain blitzking at 4200.
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Yes, we look forward to hearing what velocity you get and if it will hold a pattern. Good luck and fun project :tup:
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Speaking of overbore...there is an article in the Feb, '10 issue of Precision Shooting about a .233 -300 WSM. Has a photo of the chrono at 5019 ft/sec. He shortened a 45 gr TSX to 40 grains and a lot of RL-19. That produced approximately 450,000 rpms out of the muzzle. He had 100 yard groups that a dime would cover with 70 gr. TSX at 4000 ft/s +. PACNOR 28" 4 groove stainless barrel.
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I would think its a bit too much for such a light little bullet. I didn't see the rate of twist....nor any groups. Maybe you should of thought if you "should" before you "did"?
Not my time, and not my money, so knock yerself out. Would like to see some honest pics of the groups though....and I promise not to say I told you so..... ;)
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larry, measuring case pressure based on primer flatness is grand way to go blind. w/o a strain guage I would strongly suggest you weigh and measure your prepped brass and measure case head expansion. I assume you have a good understanding of powder stability, what you can get away with using 8700 will get you killed with a similar burn rate powder like rl 25......use caution in any changes you make, be it case weight, primer.....blah blah blah.
looks fun.
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The first 4 out of it were a tiny bit under an inch, number 5 was high about 1 1/2 inches. 60gr of H-1000 put it out at 4,091fps. I had some loaded with 61gr but they would not rigister over the crony. The cases look good to me, the rifle will rechamber fired brass, so I don't think things are streaching in the action. I think this may be my limit with the Steyr, I have a more modern S&W IBolt I may put a longer barrel on and keep working up. Larry
