270 ocw test

Pecco22

Well-Known Member
Joined
May 2, 2016
Messages
64
Hey y'all. Looking for some I put. I'm loading for my browning a bolt 270. I'm using 145gn eld x and imr4831. I do not have a chrono. So I was attempting to do a ocw test. I started below book max and worked passed it slightly... But I guess I didnt see what I expected. I loaded 15 rounds.....3 for each group. I started at 55.2 and worked up in .3 increments to 56.4....book max is 56.1 I determined that 1 and 2 didn't match up with point of impact..... But 3 4 and 5 on the first shot were all within an inch....so I thought great....second time through I started with group 5 and worked down.... The second shot on 5 was great. 4 was an inch apart from the first. 3 had a huge flyier .....so at that point....i didnt want to waste primers and bullets so I shot 4 and 5 again because they looked promising.... But as you can see each of the 3rd shots for 4 and 5 went low and right.... But look similar.... Where shoukd I go from here.... I guess I didnt see the poi like I expected to see.
 

Attachments

  • 20201128_134149~3.jpg
    20201128_134149~3.jpg
    735.8 KB · Views: 330

Dmagna

Well-Known Member
LRH Team Member
Joined
May 30, 2018
Messages
757
Location
New York
With a chrono I guess go with the best group and adjust seating depth and see if it tightens up. If not change a component, like your powder or bullet.

How far off the lands did you start?
 

WYOHTF

Well-Known Member
Joined
Oct 25, 2020
Messages
181
Location
Wyoming
Your gun may also not like the powder, and if you are over concerned about reloading supplies, this can cause a flinch problem, I’ve been through that.
If you have other powders to compare, doing the same test....
 

Pecco22

Well-Known Member
Joined
May 2, 2016
Messages
64
Your gun may also not like the powder, and if you are over concerned about reloading supplies, this can cause a flinch problem, I’ve been through that.
If you have other powders to compare, doing the same test....
I have rl19 and h4350 also
 

WYOHTF

Well-Known Member
Joined
Oct 25, 2020
Messages
181
Location
Wyoming
Those are both good powders, I’m running H4831 sc in all three of my 25-06 and my step sons .270
H4350 is almost as good.
I have R19 on hand but am saving it for fire forming, only got two pounds of it
 

can1010

Well-Known Member
Joined
Feb 27, 2012
Messages
1,167
Hornady don't mind a lot of jump .050-.090 is common. try setting to the standard 3.340 and try numbers 4-5 again
 

Pecco22

Well-Known Member
Joined
May 2, 2016
Messages
64
Was this OCW test shot at 100 yards? Those are some pretty extreme ‘fliers’ you have there. 🤔
Yes it was at 100. Best distance I have for right now. And yeah it was not what I expected. The first shot for group 3 4 5 where almost identical...... Then shot 2 in group 4 and 5 where decent....5 hit just next to the first. Group 4s second shot was 3/4-1" apart..... Then it went to heck
 

Mram10us

Well-Known Member
LRH Team Member
Joined
Oct 19, 2019
Messages
3,708
Location
Idaho
Yes it was at 100. Best distance I have for right now. And yeah it was not what I expected. The first shot for group 3 4 5 where almost identical...... Then shot 2 in group 4 and 5 where decent....5 hit just next to the first. Group 4s second shot was 3/4-1" apart..... Then it went to heck
How much experience do you have shooting and reloading? How much cooling between shots?
 

nksmfamjp

Well-Known Member
Joined
Jan 5, 2004
Messages
1,158
I would start by asking....Do you know where the other 2 holes are for group #1?

Also, for a hunting load, I start at 0.030” off the lands.

Also, quick “pro tip” I load 5 of the middle load for a 2 shot zero.....to get you close enough to not loose shots off paper.

Are you shooting mixed brass, or did you buy a bulk bag of 100 or more?

Last what are you shooting? Twist rate? Expected groups?
 
Top