Looking for help on bullets for this rifle. Not much information for varmint bullets in a 1-9 twist. Looking for accuracy and good bullet for coyotes.
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Looking for help on bullets for this rifle. Not much information for varmint bullets in a 1-9 twist. Looking for accuracy and good bullet for coyotes.
I would look at the new Sierra Tipped match kings in both 69 & 77 grains. Very impressive bullets and they do a number on yotes. 37-38.5gr of reloader 17 has been the sweet spot for the last three .22-250 barrels I have had with the 69's.
I just picked up a 12FV in 22-250, but it's a 12 twist. My first load work up was 34.9 gr of IMR 4320 and Hornaday 55 gr V-Max. It shot way under a minute at 100 and 200 yds. while moving out at 3600 fps. It'll probably do the job unless you plan to pick'm off at 500 yds +.
You won't want to go below a 55gr "Varmint bullet". Unless you want to run things very slow, the RPM from that 9-twist will be too high, and you will destroy them.
Thanks for the response , i just want to find out what other shooters are having success with. I'm looking at the 65 gr Sierra SBT game kings. Anyone with luck on these?
75g A-max and 69g TMK both shoot very well from mine with IMR4350. 55g Berger Varmint Match also shoot well with Varget.
So here is your math, to give you some ideas.
MV * 720 ÷ Twist = RPM
The really hard bullets like Sierra and Nosler have an RPM limit around 320,000 RPM. MOST others fall to the 290,000 range. Your specific barrel smoothness well change what the absolute number is.
As far as accuracy, that is up to you finding what your rifle lives.
I had a little trouble figuring out what the number 720 represented in the above formula. Although 720 is the number of seconds in an hour, that is not what is being represented. It is in fact inches per foot multiplied by seconds in a minute. It's a math short cut, but the result is the same.
Here is a good explanation of bullet twist, how it's calculated and it's importance in ballistic accuracy and terminal performance. The comments below the article, especially those by Brian Litz are also a good read, so be sure to read those too. http://bulletin.accurateshooter.com/...and-stability/
And here is a slow motion video of bullet terminal performance. https://www.youtube.com/watch?v=QfFoMyMoiX4
And another Youtube video on bullets spinning after being fired into ice. Pretty cool! https://www.youtube.com/watch?v=_57GbWN1G1w
These are what I use on coyotes, they hit like sledge hammers and are very accurate. I use H 4350, and have them moving at 3600. Killed a few past 500 yds.Quote:
Originally Posted by Qbdad14
36.6 gr H4350 with 75 a max is great on pd''s out past 425 yds. This is my Savage LRPV . work the seating depth .