I have a Wichester Model 70, .270 that I haven't shot in years and wanted to have it as a backup for an upcoming hunting trip. I purchased 130 gr. Winchester Silver Balistic Tips. I was not on paper at 50 yards so I went to 25 and this was the impact holes from 25 yards. Any ideas or comments are appreciated.
Can a .270 Tumble?
- Thread starter MDB270
- Start date
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smokey
2A TEACHER
- Jan 31, 2008
- 31,525
I'm not sure if it's possible to fire a .270 through a 30-06 or something, but I sure am interested in what the brass looked like that came out.
TheOriginalMexicanBob
Ultimate Member
The barrel rifling hasn't rotted out has it?
Try some 150gr .
I have a Savage that shoots the 150's great, 130's are all over the paper.
I also have an old Rem 760, shoots the 130's into 1" groups
Throws 150's all over the target.....
I have a Savage that shoots the 150's great, 130's are all over the paper.
I also have an old Rem 760, shoots the 130's into 1" groups
Throws 150's all over the target.....
danb
dont be a dumbass
Yeah I would inspect the rifling and the muzzle.
- Nov 5, 2018
- 291
Find out what twist is in your rifle,
if its a 1: 10, try with lighter and maybe shorter bullets,
Berger lists a 1:11 for its .270 130 and 140 gr VLDs.
Factory ammo from 120 - 160 grain is available, you should find something that works well in that rifle.
if its a 1: 10, try with lighter and maybe shorter bullets,
Berger lists a 1:11 for its .270 130 and 140 gr VLDs.
Factory ammo from 120 - 160 grain is available, you should find something that works well in that rifle.
That's my thought too. A rifle tumbling at 25 yards? Something is seriously off. Wrong bullet weight for the rifling twist rates don't typically result is such a drastic imbalance.
Agree... that is very dramatic for 25 yards. Do you remember this rifle having accuracy issues before (you mentioned you used it several years ago)... if it is a mis-sized barrel, I would have assumed you would have noticed it before... I'd take a look at it with a bore scope and see what's going on down the tube.
Biggfoot44
Ultimate Member
- Aug 2, 2009
- 33,217
Obviously it IS tumbling . A 130gr the most common , and design intended weight for .270Win , so it shouldn't have an inherent twist rate issues . If you haven't shot it much , unlikely to have severe bbl erosion issues .
So by elimination , the most likely source for sudden tumbling would be significant damage to the crown .
So by elimination , the most likely source for sudden tumbling would be significant damage to the crown .
take a round and stick the bullet into the muzzle. it should not go all the way down to the case.
http://www.memorableplaces.com/m1garand/cmpprogram6.html
it could be an issue with the bullets you purchased.
BTW, with any bolt gun, if I pull the bolt and old school bore sight it at 50 yards, I've always been on paper at 50.
http://www.memorableplaces.com/m1garand/cmpprogram6.html
it could be an issue with the bullets you purchased.
BTW, with any bolt gun, if I pull the bolt and old school bore sight it at 50 yards, I've always been on paper at 50.
smokey
2A TEACHER
- Jan 31, 2008
- 31,525
For twist, you basically need a faster twist to better stabilize longer bullets. The air they're moving through is putting pressure on the front, while the center of gravity is somewhere slightly rear of the middle. The longer the distance between those points, the more leverage is created to flip the bullet....hence more twist needed.
130 gr is a pretty standard load for .270, so basically anything chambered in it should be fine with that length bullet. If it's tumbling with 130, 150 gr would tumble even worse, as the longer 150 gr would need faster twist.
Either something is wildly jacked with the crown to knock the rear loose as the bullet clears the muzzle(which would be very obvious if its tumbling this bad), the rifling is doneskers for one of many reasons, or the op is firing the wrong load for the bore size/chamber. .280 or 30-06 could probably fire a .270, so looking at the brass around the neck/shoulder should give big clues.
Or that rifle was at some point rebored, but not remarked???
GuitarmanNick
Ultimate Member
Was your paper target fully supported or was it hanging. A hanging paper target may move on impact affecting the shape of the hole. Thought I had a pistol doing that and it turned out that after much looking, there was nothing wrong with the pistol. Just the hanging target swinging on impact. Fully supported targets give round holes!
I would second the suggestion to check the crown for damage. It does not take much damage to seriously affect accuracy.
I would second the suggestion to check the crown for damage. It does not take much damage to seriously affect accuracy.
- Feb 4, 2013
- 28,175
.270 case is based on the .30-03 case (as is the .30-06).
The .270 case is slightly longer than a .30-06, but due to the smaller bullet, it may chamber and fire in it. But no stabilization of the bullet.
I would double check the chamber and bore size
The .270 case is slightly longer than a .30-06, but due to the smaller bullet, it may chamber and fire in it. But no stabilization of the bullet.
I would double check the chamber and bore size
Winchester used a 1 in 10 twist for their Model 70's as I recall. Maybe those modern 130gn bullets are being shot too fast. I would try 150gn after you ensure that you don't have a .308 bore.
This... a mismatch caliber bullet has happened before... Maybe a 6.5cal bullet ?!
Not just with bolt guns. You can do the same thing to an AR platform by pulling the bolt carrier group and bore sighting it. You just have to remember to make scope adjustments opposite to how you adjust when shooting.
smokey
2A TEACHER
- Jan 31, 2008
- 31,525
Where are you OP? So was it a 30-06 chamber or a .280 chamber? Inquiring minds want to know.
wilcam47
Ultimate Member
dunno about 270 in 30-06 but..I tried to load a 30-06 in a .270...didnt work...ask me how i know!
I was young and had zero experience with rifles. A friends father gave me a round to try and I tried to rack it and it was jammed up. Had to take it to a gunsmith to take it out.As for the tumbling the powder might be bad/not burning properly. Check the crown, bolt head space etc. does it do this with other ammo?
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