dstoenner
Silver $$ Contributor
I had started a thread a while back about my observations with the ATIP 110 in my barrels and had found that these bullets actually were shaped so that even in a brand new barrel they wouldn't touch the lands loaded to a length that was keeping 1 caliber of bearing surface in the neck. I had said I would do an experiment of these with jumping a long way and jumping a smaller amount. My current barrel measures 2.865 OAL to lands. So I loaded 2 groups of 10, 1 group at the 1 Caliber bearing surface which is a OAL of 2.735 and another set of 10 loaded at 2.845. I used my match load for 115 DTACs in these 20 of 39.2 H4350. I also loaded 20 115 DTACs in the same brass as a comparison.
That old thread is:
http://forum.accurateshooter.com/threads/110-6mm-a-tip-in-a-6x47-lapua.3995319/#post-37707383
Then COVID hit, the range I go to is shut down because it is an indoor range. So I have been waiting. Yesterday my shooting buddy was willing to go to an outdoor range he is a member of so we loaded up and went. I set up at 100 and started testing. In hind sight I should have shot some groups. I had put a new trigger in my match rifle and had never shot it. But as they say it is what it is.
The first up was the ATIP 2.735. (.130 jump) I shot 2 groups of 5. Group 1 was .349 and group 2 was .167 Each one of those groups had 1 that was out of the group because of my new trigger. So I didn't count those 2 shots, thereby making it 2 groups of 4 each.
The next 2 groups were the 2.845 (.020 jump). Again I shot 2 groups of 5 but I really concentrated on the trigger. Group 1 was .197 and group 2 was .346. Both of these groups started out with shot 1 and 2 looking like there was no shot 2. I have had that with my 6BR but 2 groups 1 after another, WOW.
I then shot 4 groups of my 115 match load. Since this my match load I was adjusting my 100 yard zero on my scope so that one didn't count. The other 3 groups were .652, .490 and .382.
My take away from this was the ATIP, at for me, are really good bullets and VERY consistent. I have had groups in the 2's out of this gun but most are 4's and 5's So to have 2 groups in the 1's and 3's was amazing. They also seem to be very jump tolerant
But at more than twice the cost, I couldn't justify that much money for the better performance. I don't feel my F-Class shooting capability is because the 115's are only a half MOA load but my wind calls (and a million other little things, it seems that way at least) are what keeps me where I am. I think that more practice is always better than a slightly more accurate bullet at over twice as expensive.
And my other take away is that this rule I thought was golden isn't as golden. I am sure that this is a case by case study but the keeping a lot less bearing surface in the neck than 1 caliber didn't seem to phase accuracy. I will no longer make that a rule of my loads.
Thanks to all who contributed ideas when I brought up conundrums about this bullet. Thought it was only fair to share my results of testing.
David
That old thread is:
http://forum.accurateshooter.com/threads/110-6mm-a-tip-in-a-6x47-lapua.3995319/#post-37707383
Then COVID hit, the range I go to is shut down because it is an indoor range. So I have been waiting. Yesterday my shooting buddy was willing to go to an outdoor range he is a member of so we loaded up and went. I set up at 100 and started testing. In hind sight I should have shot some groups. I had put a new trigger in my match rifle and had never shot it. But as they say it is what it is.
The first up was the ATIP 2.735. (.130 jump) I shot 2 groups of 5. Group 1 was .349 and group 2 was .167 Each one of those groups had 1 that was out of the group because of my new trigger. So I didn't count those 2 shots, thereby making it 2 groups of 4 each.
The next 2 groups were the 2.845 (.020 jump). Again I shot 2 groups of 5 but I really concentrated on the trigger. Group 1 was .197 and group 2 was .346. Both of these groups started out with shot 1 and 2 looking like there was no shot 2. I have had that with my 6BR but 2 groups 1 after another, WOW.
I then shot 4 groups of my 115 match load. Since this my match load I was adjusting my 100 yard zero on my scope so that one didn't count. The other 3 groups were .652, .490 and .382.
My take away from this was the ATIP, at for me, are really good bullets and VERY consistent. I have had groups in the 2's out of this gun but most are 4's and 5's So to have 2 groups in the 1's and 3's was amazing. They also seem to be very jump tolerant
But at more than twice the cost, I couldn't justify that much money for the better performance. I don't feel my F-Class shooting capability is because the 115's are only a half MOA load but my wind calls (and a million other little things, it seems that way at least) are what keeps me where I am. I think that more practice is always better than a slightly more accurate bullet at over twice as expensive.
And my other take away is that this rule I thought was golden isn't as golden. I am sure that this is a case by case study but the keeping a lot less bearing surface in the neck than 1 caliber didn't seem to phase accuracy. I will no longer make that a rule of my loads.
Thanks to all who contributed ideas when I brought up conundrums about this bullet. Thought it was only fair to share my results of testing.
David
