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Cant get my 7mm rum Sendero to group

 
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  #1  
Old 07-23-2012, 02:25 PM
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Join Date: Apr 2012
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Cant get my 7mm rum Sendero to group

Hey I need some help. I just bought a remington sendero 7mm rum and cant get it to group at 200 yards. Its grouping .5" at 100 but cant get nothing at 200. Im using 180 bergers 90 gr. retumbo and oal is 3.65.
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  #2  
Old 07-23-2012, 02:51 PM
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Re: Cant get my 7mm rum Sendero to group

What do you mean nothing at 200 yards? 1"? missing the paper? couple of east things to check first.
1 did you get .5 at 100 one time or can you do it over and over?
2 are you adjusting the parallax out of your scope?
3 is the focus ring tightened?
4 have you tried any other seating depths? Typically a match type bullet will shoot best when seated close to or on the lands, which means with a berger you may not be able to use your magazine without getting an extended magazine box.
Make sure you eliminate every variable you possibly can.
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Mike

Get a JOB! I already feed the bears, I dont need to feed you too!

" Real elk guns start with the number 3 or bigger and blow two holes, one in and one out." - My Dad
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Old 07-23-2012, 03:43 PM
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Re: Cant get my 7mm rum Sendero to group

Ya I have got it to shoot .5 a couple different times at a 100. But at 200 I am hitting paper but am getting 2.5" groups sometimes. I have adjusted the paralax and tightened the focus ring. And the load Im using I got from a buddy and he has good results with it out of his sendero 7mm rum. Heres a pic of what it looks like at 200.
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Cant get my 7mm rum Sendero to group-imag0134.jpg  
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Old 07-23-2012, 03:48 PM
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Re: Cant get my 7mm rum Sendero to group

Well assuming nothing has changed since your 100 yard groups, and everything is tight from your action screws to your scope rings then I would move the bullets .010 or so toward or away from the lands (closer will probably be better if that is possible) and see what it does with a couple more groups, Maybe you just need to find the sweet spot. Or Maybe try a slightly slower or faster powder. only change one thing at a time so you know when you finally start heading in the right direction. In the end you may end up switching bullets
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Mike

Get a JOB! I already feed the bears, I dont need to feed you too!

" Real elk guns start with the number 3 or bigger and blow two holes, one in and one out." - My Dad
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  #5  
Old 07-23-2012, 07:29 PM
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Re: Cant get my 7mm rum Sendero to group

The faster 7mm bullet rounds don't always go to sleep at 100 yards. You can get an occasional great group with them at 100 with a poorly performing load. My dad had this happen with a 270 wsm, he hit a deer at 300 or so with it, and couldn't get another bullet into the deer until he got close to 100 yards away. A check at 200 revealed that his load was crap even though it shot sub moa at 100 the same day. He sent the rifle down the river, but a bit of 200 yard load development may have been in order.
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  #6  
Old 07-23-2012, 08:36 PM
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Re: Cant get my 7mm rum Sendero to group

Were you using the same rest for both the 100 and 200 yard groups? Alot can happen if you change from a lead sled to bipod if the action screws are not torqued properly and/or if the action is not bedded properly
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  #7  
Old 07-23-2012, 10:03 PM
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Re: Cant get my 7mm rum Sendero to group

Ya I was using the same rest both times. I'm going to make sure the action screws are tight and take a look at the stock. And I am going to move .010 towards the lands and see what happens.
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