keyholing on paper

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jsgog

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I recently picked up a Remington 740 in .244 (6mm) and put a new scope on it , sited it in at the camp at about 40 yards just to get it close , it is grouping ok but seems to be keyholing on the target , would this be because of the close range and the bullets not having time to stabilize or another issue ?

I think it was quite dirty before I shot it , first couple passes with the brush were quite stiff when I cleaned it afterwards . haven't had a chance to try it again after cleaning or at a distance yet , rifling looks good and bullet fits tight and doesn't slide in the end of the barrel , so I am thinking its not shot out .

I was shooting 100 gr Federal premium and have read there was a change in the rifling on these for the heavier bullets , not sure if this could be the issue

Any thoughts
 
If it is a real 244. Most likely has the slow twist barrel 1-12. Doesn't shoot much more than 90gr bullets very well. The 6mm was brought out to fix the issue. Same case just a 1-9 twist.
 
Ruger007 said:
If it is a real 244. Most likely has the slow twist barrel. Doesn't shoot the 100gr bullets very well. The 6mm was brought out to fix the issue. Same case just a 1-9 twist.
Click to expand...

yes it is the .244 prior to the 6mm switch , guess i will have to look for some 90's , 100 gr was all I could find right now

tks
 
From what I can find the 244 prior to 1957 had the 1-12. Changed to 1-9 in 1958. When sales still fell short Remington renamed it the 6mm Remington and introduced it in their new 700 rifle in 1963.

I have had many 6mm's. Still have 2-Ruger No1B's, a M77V, 700 CDL. It is a great cartridge superior to the 243.
 
Use common cup and core bullets in the 70 to 85 gr weight. The bullet length will greatly effect how it shots, you want as short of bullet as possible . Premium lead free bullets are long for their bullet weight and won't work well.
 
A .244 will not stabilize 100 grain pointed bullets... it will handle a round nose bullet of that weight...

A mm Rem will handle 100 grain pointed bullets.

12 twist versus 10 twist
 
Near as I can tell it was manufactured April 1959 from the barrel code so should be after the twist rate change and should be good for 100 gr from what I have read , correct ?
 
Forty yards is close. Have you tried further distances? Some bullets are wobbling and wonking through the sky until they settle down.
 
There is a website "JBM Ballistics" that has alot of useful info on the spin rates. I don't know how to post a link but try a google of it
 
maple_leaf_eh said:
Forty yards is close. Have you tried further distances? Some bullets are wobbling and wonking through the sky until they settle down.
Click to expand...

that's what I was thinking but wasn't sure , haven't had a chance to try it at a distance yet , will take it out next weekend and try it again now that it has had a good cleaning
 
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