Ran this test on new loads.
- Thread starter Longshot
- Start date
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Retest at 200 or 300yds/M.
Start at 44.2, 44.4, 44.6. Shoot 2X 5 rds groups at each load level and that will pretty much dial in where you need to be. If you really want to get fussy and have access to 500 to 700yds, I would take the best load and retest in 0.1gr on either side.
Odds are 44.4 and 44.5 will be the load you end up with - assumed you used fired brass for these groups?
I am testing to 0.1gr in my FTR's. Very easy to see on paper at 600 and beyond.
I have a similar load test process on my website Tech section. I gave up testing at 100yds/m unless there is too much snow. Much can look great at SR that falls apart at Long range.
If this is a new barrel, likely need to retune when you hit 150 to 200rds as the barrel "BREAKS IN".
If you want more Berger OTM's, let me know...
Jerry
Start at 44.2, 44.4, 44.6. Shoot 2X 5 rds groups at each load level and that will pretty much dial in where you need to be. If you really want to get fussy and have access to 500 to 700yds, I would take the best load and retest in 0.1gr on either side.
Odds are 44.4 and 44.5 will be the load you end up with - assumed you used fired brass for these groups?
I am testing to 0.1gr in my FTR's. Very easy to see on paper at 600 and beyond.
I have a similar load test process on my website Tech section. I gave up testing at 100yds/m unless there is too much snow. Much can look great at SR that falls apart at Long range.
If this is a new barrel, likely need to retune when you hit 150 to 200rds as the barrel "BREAKS IN".
If you want more Berger OTM's, let me know...
Jerry
Record your velocities. Doesn't matter whether things have changed due to barrel break-in, a new lot of components, or a temperature shift with a temperature sensitive powder. You'll find the nodes around the same velocity. Velocity, pressure and barrel time are all interdependent.
I did one with a Win M70 in 270. Started at 56 grains of H4831sc with 130 NP. As I went up in charge weight the groups got smaller around 58 gr and then started to get larger up to 60 grains. I loaded some at 58 for last hunting season. This spring I'm going to try to look for another node above 60 if I don't get pressure signs.
Yeah once I play with it a bit ill take it out to 600m for sure. I'm going to shoot some 5 rd groups to see if that 44.4 loading is repeatable, then I will tweak the charge +/- .1s on either side. Finally I may try a little seating depth although I'm sitting at max mag length at the moment and figure jumping anymore than it already is probably won't help. Keep in mind it's a tactical rifle not an f class gun so it doesn't need to be fiddled with too much.
Yep already on it. It's an old barrel that is getting towards the end of its accurate life. We shall see. I'll keep it going as long as possible before I screw on another.
