Groups open up on a 50 round day
Posted: Fri Jan 12, 2024 6:46 am
Hi,
this is .308 FTR
Barrel has 450 rounds on it
Load dev has gone well with vertical holding between .3 - .6 moa 300 - 1000
Generally speaking load dev has been in cooler temps by say 10 - 12 deg c and no more than 24 shots in a day.
First time using it in a comp in hot sunny days with 4 x 10 counting matches, I have found that the groups open up ~ 30 rounds.
Generally speaking I have to bring the POI 3 - 5 clicks (1/8 click) down to help center the group for the later relays.
It seems like it wants to shoot as I'm not chasing vertical like I would a barrel that is fouled out but the groups are larger and I have to click down during the shoot.
A month a go on a clean barrel it held .5 moa vert for the first 10 shots (first counting relay)- it hammers on the early relays.
What would you all do to fix this?
I suspect I am on the hot side and the extra round count and heat is taking me over the top as the day goes on.
I manage the carbon and copper in the barrel and use a borescope for cleaning. Could I be cleaning too much - but I don't need fouling shots to be confident of a clean in points for the first relay.
I don't think its a barrel issue as it seems like it wants to shoot - I have had barrels that have fouled out and those are just wild rides - its not like that.
I'm thinking of knocking it back a couple of 10ths in powder.
Any thoughts appreciated.
this is .308 FTR
Barrel has 450 rounds on it
Load dev has gone well with vertical holding between .3 - .6 moa 300 - 1000
Generally speaking load dev has been in cooler temps by say 10 - 12 deg c and no more than 24 shots in a day.
First time using it in a comp in hot sunny days with 4 x 10 counting matches, I have found that the groups open up ~ 30 rounds.
Generally speaking I have to bring the POI 3 - 5 clicks (1/8 click) down to help center the group for the later relays.
It seems like it wants to shoot as I'm not chasing vertical like I would a barrel that is fouled out but the groups are larger and I have to click down during the shoot.
A month a go on a clean barrel it held .5 moa vert for the first 10 shots (first counting relay)- it hammers on the early relays.
What would you all do to fix this?
I suspect I am on the hot side and the extra round count and heat is taking me over the top as the day goes on.
I manage the carbon and copper in the barrel and use a borescope for cleaning. Could I be cleaning too much - but I don't need fouling shots to be confident of a clean in points for the first relay.
I don't think its a barrel issue as it seems like it wants to shoot - I have had barrels that have fouled out and those are just wild rides - its not like that.
I'm thinking of knocking it back a couple of 10ths in powder.
Any thoughts appreciated.