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hrndy vmax comming apart?

 
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  #1  
Old 01-31-2010, 10:55 AM
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hrndy vmax comming apart?

well, I've been busy as heck this year and haven't gotten out shooting much, but I did yesterday again. I was shooting my savage 12 w/ a 12 twist 22-250 and 40 gr vmax's set on top of 39.5g IMR 4895. I was getting about 4250 fps w/ my chrono ( not sure how accurate it is but I think it is in the ballpark???). Anywho... I shot my first group w/ 3 rds at 200 w/in about 1.5" or so. Next group using a bipod shot 3 rounds and two hit paper about 3" apart and a third missed the 8.5 x 11" paper.

I was a little embarased to say the least. I shot a total of 7-3 rd groups at 200 yards and I was getting similar results... bipod didn't work to well w/ the cheap factory stock but when shooting off of sand bags I was able to get either a .75 MOA group or I was getting 5-6" or even missing the paper all together.

I know this isn't a very good test, and it will have to be done again to confirm, but I'm wondering if I could be experiencing bullet failure w/ pushing the light bullet a little too fast.

I will also add that the bore of this rifle is not that smooth... It is hard as H-E-double toothpicks to clean the copper out.

I'm no BR shooter or anything, but I hope I haven't lost my edge by that much LOL!

Thanks for any insite, Mark.
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Old 01-31-2010, 11:27 AM
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Re: hrndy vmax comming apart?

Quote:
Originally Posted by britz View Post
I'm wondering if I could be experiencing bullet failure w/ pushing the light bullet a little too fast.

I will also add that the bore of this rifle is not that smooth... It is hard as H-E-double toothpicks to clean the copper out.

I'm no BR shooter or anything, but I hope I haven't lost my edge by that much LOL!

Thanks for any insite, Mark.
It sounds like you need to visit Mr. Tubbs, and smooth up that barrel a little.
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Old 01-31-2010, 11:37 AM
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Re: hrndy vmax comming apart?

I've had that problem also, I went to the 50+gr v-max. I got the best accuracy out of the 55gr v-max. I never checked the bore of that rifle but if a guys on the raged edge that may be enough to jack some up. I wonder about the Tubbs solution also.
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Old 01-31-2010, 11:56 AM
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Re: hrndy vmax comming apart?

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Originally Posted by bigngreen View Post
I've had that problem also, I went to the 50+gr v-max. I got the best accuracy out of the 55gr v-max. I never checked the bore of that rifle but if a guys on the raged edge that may be enough to jack some up. I wonder about the Tubbs solution also.
I'm so frustrated because I've tried 60's, 55's, 50's, Nosler bt's V-max's 52 Amax's, sierra blitzkings... I've used IMR 4064, H380, IMR4895, I've fired over 400 rounds in testing trying to find somthing this rifle will group and like. Had it sent back in to be rebarreled and the same results. I looked at the test group sent back w/ the rifle and they were 40NBT's and a .75" 3 shot group (which the factory listed as half inch :( )

I finally got the 40's to shoot nice tight groups at 100 most of the time and this is what happened when I moved to 200 yards! Just gotta laugh at it all.
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Old 01-31-2010, 12:25 PM
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Re: hrndy vmax comming apart?

There are a lot of things I would eliminate before spending the money on tubbs lapping bullets. First we need to figure out why do you shoot better off bags than a bipod? is it because the bipod is really so shaky that your missing paper or is the swivel stud close enough to the barrel that when the gun goes off and the barrel whips it hits it? You gun will shoot a lot different resting clear out on the end than it will on bags close to the bhanber if ites not completely floated or like I said the stud on the inside. Second what are you cleaning practices? are you using JB's or rem bore or something to rub the pasivative surface off the copper so your solvent can corrode it away? What does your throat look like? And the most simple of all is are your rings and bases tight? and was the rifle bedded properly when you put it together last time? front screw first then rear? Then of course maybe your theory that the bullet is just too light. I doubt its coming apart but maybe you should try a 55 gr. or something. if all the free stuff doesnt fix it try the tubbs. I used them and they worked well to smooth up my barrel.
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Old 01-31-2010, 12:44 PM
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Re: hrndy vmax comming apart?

for what it's worth, i have a newly finished BERGARA bbl'd 22-250 (1-10 twist) that I just got done building. I've found that it will shoot .474" 100 yd groups off the heavy cardwell rest but only .667 or so with the bipods (harris) I had a friend shoot it and I watched as the gun moved a BUNCH when using the bipods off the bencn (solid concrete top). moved to the ground, prone with bipods, and the groups came back to .48-.50, so that could be your problem also. I was amazed that this rather heavy rifle in a small cal. would jump like that.
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Old 01-31-2010, 01:09 PM
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Re: hrndy vmax comming apart?

Quote:
Originally Posted by britz View Post
well, I've been busy as heck this year and haven't gotten out shooting much, but I did yesterday again. I was shooting my savage 12 w/ a 12 twist 22-250 and 40 gr vmax's set on top of 39.5g IMR 4895. I was getting about 4250 fps w/ my chrono ( not sure how accurate it is but I think it is in the ballpark???). <snip>
I've had much better luck with the 40g NBT and 55g NBT in my Savage LRPV than with V-Max bullets. The results you are getting are pretty ragged, more ragged than I'd expect to see from just a bullet difference.

Things that come to mind as making a rifle erratic like that are:

Loose scope mounts.
Bad scope.
Bad bedding/loose action screws.
Barrel touching the stock someplace.
Loose barrel/receiver joint (not torqued enough).
Bullets inconsistantly touching/not touching the lands.
Brass that's right on the edge of being too long so some crimps bullets, some doesn't.
Eccentric chamber.
Reamer chatter in the chamber and throat.
Damaged crown (if there is an abberation on edge of the the crown, no matter how small, if it is big enough that you can see it, it's a defect that can cause problems).
Goobers in the barrel. Bore sighter damage near the muzzle, cleaning rod damage on either end, <whatever>. I just looked at a .22-250 that had a whole land worn away on one side of the bore at and beyond the throat from cleaning rod damage (the guy doesn't believe in bore guides so he gets to buy a new barrel).
Bore exhibiting severe tooling chatter (makes them copper up real fast).
Thermal errosion in the throat.
Severe eccentricity in loaded ammo.
Action severly out of true.
Bolt mating with only one lug.
Loose bolt with lots of vertical bolt play back near the bolt handle.

You might learn a lot from a good borescope examination. I've seen some pretty amazing things in rifles with "new" barrels.

First thing I'd do is check the easy stuff first. But I'd check for all of it. It has to be "something". And there is no rule that says it has to be just one thing. It could be several things wrong.

Fitch
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