The 10 rounds @ 300 yards cgn online challenge.

6x47 Lapua 2nd succesful attempt 1.462"

2nd attempt slightly better than the first, 10 rounds fired at 300 yards in about 60 seconds.
Trued 700 action, Benchmark barrel, Cadex chassis, Nightforce ATACR 5-25, Timney calvin elite 2 stage trigger, 105gr Berger hybrids, H4350 @ 3046 FPS, Zombie Green cerakote. Shot off an Atlas bipod and rear bag. Quite happy but another attempt will come soon.

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span09 said:
2nd attempt slightly better than the first, 10 rounds fired at 300 yards in about 60 seconds.
Trued 700 action, Benchmark barrel, Cadex chassis, Nightforce ATACR 5-25, Timney calvin elite 2 stage trigger, 105gr Berger hybrids, H4350 @ 3046 FPS, Zombie Green cerakote. Shot off an Atlas bipod and rear bag. Quite happy but another attempt will come soon.

View attachment 122070View attachment 122071
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That's a nice looking rifle you have there!
 
The same AI AX as my 6XC and 6.5X47 barrel attempts but this time just using the factory 308 barrel. The picture is rotated 90 degrees. The extra hole is a 223, I have started to reuse targets.

The calipers are already zeroed out on .305.

2.742" CTC at 300M using an atlas bipod and rear bag.

X2HexIH.jpg
 
Nice shooting Ryan. Is your .308 a Lothar Walther Barrel?


Today's attempt was unsuccessful but I learned two valuable lessons:

- My rifle is capable of shooting under half moa at 300 (8 under 1.4" this AI just continues to impress me).

- Pay attention to the rear bag sliding out the side of the stock when firing a fast string.

rX3uTCg.jpg


Damn, almost had it.
 
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J996 said:
Nice shooting Ryan. Is your .308 a Lothar Walther Barrel?


Today's attempt was unsuccessful but I learned two valuable lessons:

- My rifle is capable of shooting under half moa at 300 (8 under 1.4" this AI just continues to impress me).

- Pay attention to the rear bag sliding out the side of the stock when firing a fast string.

rX3uTCg.jpg


Damn, almost had it.
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I believe it is, just the factory 1 in 12 twist. I actually find rear bag technique with AIs tricky due to the chassis shape. I am hoping to be the first boomer on the list with my AWSM.
 
Ryan.M.Anderson said:
I believe it is, just the factory 1 in 12 twist. I actually find rear bag technique with AIs tricky due to the chassis shape. I am hoping to be the first boomer on the list with my AWSM.
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Yes that ground spike is a pain to work around. However I'm shooting tighter thanks to a technique I found on SH. I used a Triad triangle (pie shaped) rear bag, spun the ground spike main housing into the down position, set the bag upright, tip of triangle under rear stock flat section and pulled the bag against the spike and back into my shoulder.
 
That's why it's a 10 shot challenge.

Not only the difficulty in replicating the shot 10 times but also the pressure in your thoughts to do it. ;)

I don't get fliers, I just get groupings that look like I chuck lawn darts at a Frisbee! :redface:
 
Yup- thats what I have been doing with my 300wsm, 8-9 shots pretty decent- one that pushes it out to over 3".
Just as bad as when you do this- Next time I am shooting a ladder test I will make sure it has ten steps!
HZSdKlT.jpg
 
If this was one of my barrels, the first thing would be to check for throat erosion. that is alot of rds down the barrel and throats will move.

If a throat is so long that any particular bullet can leave the case neck BEFORE it is fully engraved, you get these zingers. When I observe these type of "outs" on target AND it doesn't agree with the conditions AND the barrel has a high rd count, it's time to put it to pasture.

I used to set back but with todays costs AND the wear down the bore, I find it better to start with a new barrel.

Another option would be use a heavier bullet with a longer bearing surface. You are bridging the gap that has been created. That is how I help customers set up their new Rems with super long throats. May not be ideal wrt to mag feeding and such BUT it is a way to extend useable life.

If you were shooting a 175gr MK, I would suggest the Hrn 178gr Amax which has a goofy long bearing surface for the bullet weight. The rub.. by the time you get a new load for this new bullet, has the throat moved again negating any benefit?

Barrel is nearing the end... me, I would just start with a new barrel and enjoy another 3000rds of tight groups.

Jerry
 
Mystic Precision said:
If this was one of my barrels, the first thing would be to check for throat erosion. that is alot of rds down the barrel and throats will move.

If a throat is so long that any particular bullet can leave the case neck BEFORE it is fully engraved, you get these zingers. When I observe these type of "outs" on target AND it doesn't agree with the conditions AND the barrel has a high rd count, it's time to put it to pasture.

I used to set back but with todays costs AND the wear down the bore, I find it better to start with a new barrel.

Another option would be use a heavier bullet with a longer bearing surface. You are bridging the gap that has been created. That is how I help customers set up their new Rems with super long throats. May not be ideal wrt to mag feeding and such BUT it is a way to extend useable life.

If you were shooting a 175gr MK, I would suggest the Hrn 178gr Amax which has a goofy long bearing surface for the bullet weight. The rub.. by the time you get a new load for this new bullet, has the throat moved again negating any benefit?

Barrel is nearing the end... me, I would just start with a new barrel and enjoy another 3000rds of tight groups.

Jerry
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Well I measured free bore today and my SMK's are now jumping 40 thou instead of their usual 20 thou. The rifling used to start at 2.260" now its 2.280".

Edit to add: I will try some 155's they can handle a long jump.
 
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