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257 stw blowing primers

 
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  #1  
Old 10-15-2012, 06:05 PM
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257 stw blowing primers

The rifle is a 700 remington, pacnor 26 inch barrel, trued, oversized threads sleeved bolt, and a few other things.
I got the rifle last winter and worked up a load 81 gr R-25 with a 100gr nosler e-tip. it is loaded .090 off the lands and around 3850 fps. All was good. It put 15 shots into a 1 inch square at 100 yards.

So this fall I took it back out and loaded a few bullets to sight in the scope ( I had swapped out the VX-7 for a Vx-3 LR). That is where it all starts. Now it won't shoot a group. And it wants to blow the odd primer out. So I double checked everything thought the brass was getting used up. Sized up some new Remington brass (7mmstw necked down the same way as the last stuff) same thing. Then I realized I had been using federal 215 primers, last year I had been using CCI magnum primers.

Went back and sized up 3 more brass loaded them with CCI primers and only 80 grs of powder, first 2 shots almost touching (at 200 yards) bolt lift was all good, no extracor marks thinking this is all good now, then the third shot blew the primer out and was hardly on the paper.
Temperature is very similar to last year, same powder.

Any Ideas?? Would like to try something but not sure what.

Thanks
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Old 10-15-2012, 07:54 PM
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Join Date: May 2012
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Re: 257 stw blowing primers

Quote:
Originally Posted by Cheyenne 1 View Post
The rifle is a 700 remington, pacnor 26 inch barrel, trued, oversized threads sleeved bolt, and a few other things.
I got the rifle last winter and worked up a load 81 gr R-25 with a 100gr nosler e-tip. it is loaded .090 off the lands and around 3850 fps. All was good. It put 15 shots into a 1 inch square at 100 yards.

So this fall I took it back out and loaded a few bullets to sight in the scope ( I had swapped out the VX-7 for a Vx-3 LR). That is where it all starts. Now it won't shoot a group. And it wants to blow the odd primer out. So I double checked everything thought the brass was getting used up. Sized up some new Remington brass (7mmstw necked down the same way as the last stuff) same thing. Then I realized I had been using federal 215 primers, last year I had been using CCI magnum primers.

Went back and sized up 3 more brass loaded them with CCI primers and only 80 grs of powder, first 2 shots almost touching (at 200 yards) bolt lift was all good, no extracor marks thinking this is all good now, then the third shot blew the primer out and was hardly on the paper.
Temperature is very similar to last year, same powder.

Any Ideas?? Would like to try something but not sure what.

Thanks
blown primers= damn hot loads

things to check
1. fouled barrel?
2. same lot of brass, powder, etc. ??-- if not you need to work up your load from no warmer than mid load back to full throttle
3. are you sure you weighed the powder correctly, seated the bullet to the same oal. etc. ??
4. e-tip bullets build pressure like there's no tomorrow-- you have to stay back a bit to account for this like you did with original barnes X
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  #3  
Old 10-15-2012, 08:47 PM
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Re: 257 stw blowing primers

same lot of powder and primers

barrel was nice and clean
double checked length and powder weight

It just seemed strange I shot about 50 or 60 this spring after I had it all dialed in and all was good, accurate, no signs of pressure, bolt lift was good, no flattened primers, no extractor marks.
It is all good then all of a sudden it will blow a primer out.
I just remember reading somewere about the 257 seeming to have an issue with this.
I have another one of these in 257 stwAI that I shoot a 110 accubond . And I have one in 7mm stw.
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Old 10-15-2012, 08:53 PM
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Location: S.E. Michigan
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Re: 257 stw blowing primers

I'm curious, are you hand seating primers or seating on the press and how do they seat? Is there a definite resistance or not?

Just because the brass is new don't mean the primer pockets are good.

Sounds hot to me too but you could have a pocket issue....
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  #5  
Old 10-15-2012, 09:10 PM
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Join Date: Aug 2010
Posts: 100
Re: 257 stw blowing primers

Extreme rounds like this are squirrelly for sure. I quit rl25 and went to ram shot magnum when it was first around for 257 stw. Even at that, i never reloaded my brass, half wouldnt hold primers. More recently I went to retumbo. Not quite the velocity but more stable. Etip is pretty bad, too. That combo is likely verge of hand grenade, even just a few thousandths closer to rifling or few degrees warmer could do it. If everything was identical, I would suspect a carbon ring around six inches ahead of chamber. If you push a nylon brush slowly, feel for resistance. If there is a rough spot, it could be carbon ring. Might get it with foam, otherwise, use slow back and forth with jb bore paste and kroil, or something similar. Just don't use metal brush. If no carbon ring, I'd be grasping at straws.
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  #6  
Old 10-15-2012, 10:07 PM
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Join Date: Dec 2007
Posts: 50
Re: 257 stw blowing primers

I seat all my primers by hand. They all seemed to feel normal when seating them.
I had tried ramshot and retumbo, it didn't work all that well for me.
I hadn't heard of the e-tips causing pressure problems, I guess thats why we have these forums to ask questions. I have some swifts I could try.
I will also check with a brush to see if there is a carbon ring.
Hopefully this week the wind will go down and I will try and see if I can get this figured out.
Thanks
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  #7  
Old 10-15-2012, 11:24 PM
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Join Date: Jul 2011
Location: manitoba, canada
Posts: 80
Re: 257 stw blowing primers

I had a 25-06 (factory savage) that started doing this after about 400 rounds down the pipe.... Didn't matter what I did load wise ie. down loaded to mild loads, different bullet and powder combos.... It would shoot a couple shots accurately then I'd get a blown primer and either wicked bad fliers or vaporized bullets in flight... Turns out it had some nasty fire cracking... Gunsmith that bore scoped it said it was the worst he'd ever seen... Turns out long firing strings on hot days in the gopher patch are a bad idea
I say take it to a smith and have him take a look down the barrel...

Orch
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