barnesuser28 said:COAL with 180 grain berger will be 3.275 touching the lands.glo said:My numbers using Load From A Disc based on an MV of 2700fps show: 57.0 grains H4831; load density of 104.1%; peak pressure of 55,000cup (65478psi). This using a 180 grain Berger VLD with a seating depth of .603â€, COAL of 3.100†from a 24†barrel.
This would be considered an over pressured load, beyond SAAMI specs. SAAMI for a .284 Winchester Pmax for the average individual is 54,000cup (63,962psi).
For the above individual at 54,000cup (63,962psi) would be an MV of 2676; 56.4 grains H4831 and a load density of 103.2% with same bullet, seating depth, COAL and barrel.
Thank you very much glo! I will probably try h4350 first for its lower density, and to see how my gun likes it, if it doesnt shoot 1/3 MOA or better i will give h4831 a try. Again thank you very much!Good Afternoon Barnesuser28,
I redid the numbers for you. I set the bullet back .010†as touching would increased the pressure to an unknown quantity. So... With my numbers using Load From A Disc based on; a COAL of 3.265â€; Pmax for the average individual at 54,000cup (63,962psi); 180 grain Berger VLD with a seating depth of .438†and 24†barrel, here is the results. I also added in H4350. MV of 2706; 59.3 grains H4831 and a load density of 103.4% and MV of 2711; 54.6 grains H4350 and a load density of 95.3%.
Personally, I still don't think you will get as high as 2700fps with safe pressure. If you have a strain gauge setup that would give you the definitive answer on pressure. Just remember to back off if you start getting head expansion of .0005â€, sticky bolt or flattening primer.
Let us know how it goes.
P.S. Here is the numbers for R17. MV of 2711; 54.8 grains R17 and a load density of 95.7%. No change in velocity at 54,000cup.
glo, can you please run these again this time with a 26" barrel and use a 162 grain A-Max at 3.185" which would be at the lands so 3.175'' EDIT: with H4350.glo said:barnesuser28 said:COAL with 180 grain berger will be 3.275 touching the lands.glo said:My numbers using Load From A Disc based on an MV of 2700fps show: 57.0 grains H4831; load density of 104.1%; peak pressure of 55,000cup (65478psi). This using a 180 grain Berger VLD with a seating depth of .603â€, COAL of 3.100†from a 24†barrel.
This would be considered an over pressured load, beyond SAAMI specs. SAAMI for a .284 Winchester Pmax for the average individual is 54,000cup (63,962psi).
For the above individual at 54,000cup (63,962psi) would be an MV of 2676; 56.4 grains H4831 and a load density of 103.2% with same bullet, seating depth, COAL and barrel.
Good Afternoon Barnesuser28,
I redid the numbers for you. I set the bullet back .010†as touching would increased the pressure to an unknown quantity. So... With my numbers using Load From A Disc based on; a COAL of 3.265â€; Pmax for the average individual at 54,000cup (63,962psi); 180 grain Berger VLD with a seating depth of .438†and 24†barrel, here is the results. I also added in H4350. MV of 2706; 59.3 grains H4831 and a load density of 103.4% and MV of 2711; 54.6 grains H4350 and a load density of 95.3%.
Personally, I still don't think you will get as high as 2700fps with safe pressure. If you have a strain gauge setup that would give you the definitive answer on pressure. Just remember to back off if you start getting head expansion of .0005â€, sticky bolt or flattening primer.
Let us know how it goes.
P.S. Here is the numbers for R17. MV of 2711; 54.8 grains R17 and a load density of 95.7%. No change in velocity at 54,000cup.