Thread: Double grouping .... likely causes ?

A couple of pics - before and after fixing the mag box binding issue. Confirmed my diagnosis of the cause for double grouping.
This one before - a few different loads & pills all showing 2 shots in reasonable proximity (~1 moa) but the third flyer out by 2 -3in.


This one after (remember these are not proven loads in this set up, still very much starting load dev.) Chose two that looked promising even with binding max box issue and ran them again with max box fixed.

First group (at bottom) of 4 - the first shot is cold/clean bbl, next 3 show some promise just under 1 moa.
2nd grp, different pill/load looking better at ~ 0.75moa.

So now I can get on to the load dev. Beware of binding mag box !!! Kind a rookie mistake but hard to spot in this rifle.

Originally Posted by chainsaw

A couple of pics - before and after fixing the mag box binding issue. Confirmed my diagnosis of the cause for double grouping.
This one before - a few different loads & pills all showing 2 shots in reasonable proximity (~1 moa) but the third flyer out by 2 -3in.
Attachment 136045

This one after (remember these are not proven loads in this set up, still very much starting load dev.) Chose two that looked promising even with binding max box issue and ran them again with max box fixed.
Attachment 136046
First group (at bottom) of 4 - the first shot is cold/clean bbl, next 3 show some promise just under 1 moa.
2nd grp, different pill/load looking better at ~ 0.75moa.

So now I can get on to the load dev. Beware of binding mag box !!! Kind a rookie mistake but hard to spot in this rifle.

Hi Chainsaw,
It's good to see the pics.
Time will tell if you can now shoot consistent moa groups from now on. They need to be 5 shot groups. If so, you have solved the problem.
What I see in those photos is 3" groups in the top pic and 2" groups in the bottom pic. A single flier out of 3 shots does NOT make a second group. In a 3 shot group, two shots will usually be closer together than the other. Those photos don't show double groups, do they ?
This could just be a case of unsatisfactory grouping at first, which you have now fixed - well done !
I have trouble seating the mag box when I reassemble one of my rifles and its very easy to get wrong with proud sitting and rocking bottom metal. I found it very hard to figure it out. Not sure I have even now.