7mm 190gr A tip

[davidjoe]

These A tips could start dominating f class competitions with there big wind saving Bc's

The approach isn’t novel. The formula of a more expensive, most carefully factory-produced, higher BC match bullet was Berger in a nutshell to my recollection, relative to its competition. I think Berger pushed BC more to the forefront of discussion than it ever had been. They have done such an exceedingly good job with that approach that prone fire equipment lists show nearly everyone using them.

 

[rardoin]

I shot these at 2780fps in a 1000yd match today at a difficult range know for lower scores and got a 591-20x. Still a bit of vertical in my load but I am very early in development with this bullet and chambering combo. I had 1 MOA of vertical but dang they hold tight in the wind. I feel that with a little more work I can close that vertical a bit. Time will tell though. I feel good enough to order at least 500 more at this point.

Oh, shot a two relay match 3x20 and two matches back to back with 10 and 11 sighters respectively so match 3 had a really hot barrel and NO blow ups. Temps were in the mid 90’s.

BTW, these were shot in my 7 Creedmoor BSAI.

 

[1shot]

@rardoin,
What is the H2O capacity of the 7 Creedmoor BSAI? I've never heard of it, so I'm curious as to how it compares to my Shehane.
Thanks,

Lloyd

 

[dskogman]

Looks like some people are having issues with the Atips blowing up as well. Don’t know how accurate it is though.
https://www.snipershide.com/shooting/threads/hornady-147-eldm-blowing-up.7013159/

 

[rardoin]

I still have some concern because of the various reporting of ELD failures and that both lines use the same jacket I think.

 

[davidjoe]

Looks like some people are having issues with the Atips blowing up as well. Don’t know how accurate it is though.
https://www.snipershide.com/shooting/threads/hornady-147-eldm-blowing-up.7013159/

One of the comments in your link said this:

“Another in my squad lost 6 A-tip 153s out of a Kreiger 8-twist 6.5-284 at a rather innocuous 2820 fps (less than 1000 rounds of H1000). A neighboring squad had a shooter loose about half of his 153 A-tips out of a 6.5 PRC on day 1, cleaned his rifle Saturday night then had better results Sunday but still experienced disintegrating bullets. Very low round count rifle built specifically for that match.”


I quoted that because my own blowups of ELDM 180’s were in Krieger saum barrels. I came to suspect that Krieger’s bore is a bit tighter because of blowups, supported by my needing to download for two of them relative to Brux, and now also Bartlein. Then this summer a club shooter also blew up ELDM’s in his new Krieger, and it was a .284, the smallest case you can run a 180 from. I’m pretty certain now that ELDM’s will not mix well at all with the typically tighter Kreiger barrels, although I do think they can be blown up in others if you try.

 

[rardoin]

Just have to run a few dozen of those Tubb pixie dust bullets to loosen the bore David

 

[rardoin]

I’m not running these things very fast. The cartridge is capable of easily getting 2900+ fps/30” tube and I am nowhere near full throttle. I hope this keeps them together. I would advise everyone to stay away from them for a few years until I can make sure they are safe (at least F class competitors).

 

[gman47564]

Not to be negative but i pulled a 135 . 153 gr atips yesterday because about a third of them were going poof about 30 yards out of the barrel.. the gun is a 6.5 prc and i was only pushing them at 2900 fps.. temps in the mid 90's.. i had been shooting a different lot of them about 3 months ago at 3045 fps in 60 and 70 degree weather without a failure.. today i loaded up some 153.5 bergers at 2900 fps and had no issues with blow ups.. 95 degrees today as well.. i will try these atips again once it cools off but im wondering if they didnt have a bad run of jackets in these 153 gr. Bullets.. i also shoot 135 gr. Atips and 166 gr. Atips with no issues..

 

[davidjoe]

Not to be negative but i pulled a 135 . 153 gr atips yesterday because about a third of them were going poof about 30 yards out of the barrel.. the gun is a 6.5 prc and i was only pushing them at 2900 fps.. temps in the mid 90's.. i had been shooting a different lot of them about 3 months ago at 3045 fps in 60 and 70 degree weather without a failure.. today i loaded up some 153.5 bergers at 2900 fps and had no issues with blow ups.. 95 degrees today as well.. i will try these atips again once it cools off but im wondering if they didnt have a bad run of jackets in these 153 gr. Bullets.. i also shoot 135 gr. Atips and 166 gr. Atips with no issues..

I’m very curious what your twist rate, groove count and barrel make is.

 

[rardoin]

@gman47564 Grant, what make of barrel and land type? (conventional cut or canted lands)

 

[gman47564]

My barrel is a shilen select match barrel from northland shooter supply.. 8 twist. conventional cut i would think robin.. like i said i sent 400 of these bullets down range earlier this year and never had a problem. Even running them alot faster then.. my barrel has about 500 rounds on it now.. all slow fire.. its in good shape still..

 

[rardoin]

Geant, I had a similar experience with 150 SMK’s/ 6.5x55 Imp in a conventional grooved Brux barrel. I started getting blow ups after 350 or so rounds in the barrel. Sierra recommended canted land barrels as the sharp engraving if a ‘straight cut’ land weakened the jackets and increased the chances of failures.

 

[gman47564]

i kind of expected the 153.3 berger hybrids to blow up in the thing too robin but they didnt... its wierd my 22 creedmoor will blow up a 90 grain berger vld every once in a while when its 90 plus degrees out... when its below 90 they dont.... course when its this hot here with the humidity the air is like soup... lol im guessing the atips will shoot again when it cools down... i hated to say any thing about this because i like hornady bullets but i seen where a couple others were having the same problem with the same bullet so i spoke up too...

 

[davidjoe]

Thanks for sharing the barrel details. I was hopeful that different jackets were used than ELDM’s but I think they are the same.

 

[Turbulent Turtle]

i kind of expected the 153.3 berger hybrids to blow up in the thing too robin but they didnt... its wierd my 22 creedmoor will blow up a 90 grain berger vld every once in a while when its 90 plus degrees out... when its below 90 they dont.... course when its this hot here with the humidity the air is like soup... lol im guessing the atips will shoot again when it cools down... i hated to say any thing about this because i like hornady bullets but i seen where a couple others were having the same problem with the same bullet so i spoke up too...

You have it exactly backwards. When it's hot and humid, the air is thinner. Water vapor is lighter which is why we have clouds flying around instead of crashing into the ground all the time. Water vapor is H20 and H is a lot lighter than 70-some percent of the atmosphere which is N (nitrogen).

It's possible that your powder is affected by heat enough to generate a higher MV and consequently a higher spin rate. You might want to keep your ammo in a cooler until you're ready to use it.

 

[gman47564]

i step outside of a air conditioned building and shoot so my ammo isnt getting heat soaked from the heat but i know what you mean...

 

[RDavies]

If guys can keep the groups small, yes. Sierra had some very high BC releases with the 197 and 183 a few years back but I don’t think a lot of shooters saw aggregate scores go up with them.

The Sierra 183s are lovely bullets and can shoot lovely little groups consistently once you find what seating depth they like. Where most people went wrong with them is assuming they could try them in their current 9" barrels they were using with their 180-184 Bergers, when the 183 Sierras really did need a faster twist as they are longer than the 184s.

 

[Ron Gorski]

Not to be negative but i pulled a 135 . 153 gr atips yesterday because about a third of them were going poof about 30 yards out of the barrel.. the gun is a 6.5 prc and i was only pushing them at 2900 fps.. temps in the mid 90's.. i had been shooting a different lot of them about 3 months ago at 3045 fps in 60 and 70 degree weather without a failure.. today i loaded up some 153.5 bergers at 2900 fps and had no issues with blow ups.. 95 degrees today as well.. i will try these atips again once it cools off but im wondering if they didnt have a bad run of jackets in these 153 gr. Bullets.. i also shoot 135 gr. Atips and 166 gr. Atips with no issues..

contact Hornady. They requested that I send some of my 6.5, 153 back for testing. My lot #s are 2191908 and 2192437. I blew up 5 bullets. What are your lot #s?

 

[gman47564]

my lot # is 2191978...