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ATTN: sr90 velocity loss with 2" shorter barrel

 
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  #1  
Old 02-11-2002, 02:21 PM
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Posts: 469
Re: ATTN: sr90 velocity loss with 2" shorter barrel

Is the accuracy point at the same velocity as before? Thanks for remembering.

I haven't really decided on an action yet. I really like Prairiegunworks LRT-2 action, they make it in a single shot or repeater (their repeater will allow a maximum OAL of 4.5 inches, WOW!). Only problem is it costs $1,600 (single) $1,900 (repeater).

I would probably be served just fine with a single shot, just thought it would be nice to have a repeater. I Think a 2" diameter action would be too big for my application, somewhere around 1.5" would be perfect. I was hoping to get a good action for about $1000.00 or less.


Any reccommendations would be appreciated. Also any links to websites with the actions.
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Old 02-11-2002, 03:56 PM
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Join Date: May 2001
Location: NC
Posts: 352
Re: ATTN: sr90 velocity loss with 2" shorter barrel

Is the accuracy point at the same velocity as before?

don't have it fully tuned yet, but right now it's very close. My old accuracy load was at 2929fps average for 10 shots the last time I chrono'd it. If this last R25 laod works better on the next trip I'm switching powders and it appears this load is going to be around 2930fps +-. So it's very close.

BAT Actions are very good and what I currently have. Bruce makes some smaller diameter actions also. Checkout his web site to see how small you can get one in a .590" bolt face. Also Nesika Bayhas some scaled down action that support the .590 bolt face. Jim Borden of Borden Rifles also makes hunting weight actions and rifles. Allan Hall of Hall Manufacturing also makes actions for the 590 bolt face. Jerry Stiller is starting to make bigger actions now also. His web site is at Stiller Precision. There's other I'm sure, just can't remember them all right now.

Good Luck,
Steve
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  #3  
Old 02-12-2002, 12:18 AM
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Join Date: May 2001
Location: NC
Posts: 352
ATTN: sr90 velocity loss with 2" shorter barrel

sr90,
Finally able to shoot for approx 2hrs this weekend. Didn't get to load up the original Lot# of H1000 to have a 1-to-1 comparison of velocity loss, but with the R25 loads I was using I'm back to within 40fps of where I was. This chamber throat is .100" shorter also and that could account for some of that difference. Remember because I'm going for all out accuracy and not max velocity, I may not be seeing the true effect of the shorter barrel also. But even so with the 30 1/4" barrel now, I was able to easily get 2940fps with R25 powder without pressure. I could easily go over 3000fps if I used any of the slower powders. How much over 3000fps would be speculation.

good luck with your project. Have you made any decisions on it yet? Last I knew you were considering single shot actions.

Steve
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  #4  
Old 02-12-2002, 01:49 PM
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Re: ATTN: sr90 velocity loss with 2" shorter barrel

Thanks for the all the Links, looks like I will be adding a lot of bookmarks.
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  #5  
Old 02-13-2002, 06:14 PM
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Posts: 469
Re: ATTN: sr90 velocity loss with 2" shorter barrel

I got another question; lets say I put a 34+ inch barrel on the 338 Yogi, it would increase velocity but would the point of best accuracy stay at 2920 fps or do you think it would increase porportionally to the length of the barrel?

I think it would increase but how much, I don't know.
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  #6  
Old 02-13-2002, 09:13 PM
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Join Date: May 2001
Location: NC
Posts: 352
Re: ATTN: sr90 velocity loss with 2" shorter barrel

Sr90,
It will go up some. I don't know if I can answer how much though. Another shooter from the NC 1000yd club, Bill Shehane has a 338 Yogi on a 45" barrel and he got 3165fps with a 96gr load of R25 and 300gr bullets. His chamber was cut with the same reamer right after mine. After he got done screwing around with about 5 different barrel block setups he finally got it shooting pretty consistant, but then stopped shooting it. So I don't know the real accuracy potential with the higher velocity. He hasn't shot it in over a year or so now.
Then the question is.... would the best accuracy at the higher velocity node match the best accuracy of the low velocity node? My thinking right now is no, but it's all speculation and nobody has any proof one way or the other. That's why the quest continues for that elusive .000" group. But I did come within 58 thousands of that perfect group this past weekend with my Light Gun class rifle. We're having fun now!! whhaaa hooooo

FYI: notice the relatively small velocity increase of that 45" barrel over my old 32". Find and read Dan Lilja article on using extra long barrels and velocity loss. I'm may be going out on a limb here, but there's probably a reason why Darryl's 338/416 barrel is in the high 30" range.

Good Luck,
Steve
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  #7  
Old 02-14-2002, 04:09 PM
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Join Date: Dec 2001
Posts: 469
Re: ATTN: sr90 velocity loss with 2" shorter barrel

I have already seen Dan Lila's article, it is very informative. My thoughts are the same as yours, that the best accuracy will be seen at the lower velocity (2920 fps). Tell me a little more about the amazing group you shot last weekend, what rifle did you shoot it with, how far, etc...
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