varminter185
New member
Hey guys heres a few question for the guru's. If possible, please answer within the guidelines of my components. I know there are better powders. Namely h4350 but I want to learn to tune rounds to my rifle since everyones is different! I have a small quantity of h4350, but a large quantity of imr 4350. My berger vld's 140 grain came in today, .612 BC .313 g7 bc.. trying to reach 2750-2800 fps....
doing some playing around with a dummy proofing round I created. I found the jam length is 2.940 coal, this has a calculated seating depth of .362 inches. Putting it just inside the neck at the shoulder. dont like jamming rounds into the lands.. so im going to do the berger sweetspot tuning to find the jump that they like best.
So now my question is. Berger hasnt listed imr 4350 in their book only h4350. Some intense digging I found a few suggestions. To take the min load for h4350 listed and work up .2 grains from there to find max load, then to begin development in those parameters. Does this sound acceptable and safe?
Next, when finding the sweetspot jump depth. Do you find a phenomenal shooting load at a standard seating depth to find a node and then start changing the seating depth to tune?
Or take a mid charge and tune seating depth then find charge node for that depth? Theres no mention of the process in the manual?
I plan to work up the max load parameters over a chrono, mid 40-50s temperature. And stop when I near 2800 or pressure signs appear, if the node is slightly below that I guesstimate that pressures at a higher temp would still be acceptable, true?
Silly questions I know, but I want to get this right, good LR practice takes accurate ammo. And I want to make the best this rifle deserves!
doing some playing around with a dummy proofing round I created. I found the jam length is 2.940 coal, this has a calculated seating depth of .362 inches. Putting it just inside the neck at the shoulder. dont like jamming rounds into the lands.. so im going to do the berger sweetspot tuning to find the jump that they like best.
So now my question is. Berger hasnt listed imr 4350 in their book only h4350. Some intense digging I found a few suggestions. To take the min load for h4350 listed and work up .2 grains from there to find max load, then to begin development in those parameters. Does this sound acceptable and safe?
Next, when finding the sweetspot jump depth. Do you find a phenomenal shooting load at a standard seating depth to find a node and then start changing the seating depth to tune?
Or take a mid charge and tune seating depth then find charge node for that depth? Theres no mention of the process in the manual?
I plan to work up the max load parameters over a chrono, mid 40-50s temperature. And stop when I near 2800 or pressure signs appear, if the node is slightly below that I guesstimate that pressures at a higher temp would still be acceptable, true?
Silly questions I know, but I want to get this right, good LR practice takes accurate ammo. And I want to make the best this rifle deserves!
Last edited: