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I went to McHenry last week with my Rem 700 in 308 Win and some handloads to run over the chrony. I had previously worked up a 42 grain load of H4895 in a Lapua case under a 155 grain HPBT and a CCI 200 large rifle primer. Seated to 2.800 COAL, this load runs at an average of 2802 FPS out of my 24” barrel. (This load worked in my rifle, may not be the same in yours.)
I copied that load using Win brass and wanted to see the difference over the chrony. The same load in Win brass gave me an average of 2740 fps. I know Win brass has about 1 to 1.5 grains more capacity compared to Lapua brass, so I expected the Win loads to run slower.
The Hodgdon Reloading site starts this load at 43 grains (2735 fps) and maxes at 46 grains (2873 fps) using Win brass. I want to run both of these to reach the same velocity, so I made some math assumptions.
My load of 42 grains of H4895 in Win brass gives me roughly the same velocity of Hodgdon’s starting load at 43 grains. I know pressure/speed are not linear, but extrapolating the min/max loads gave me a load of 44.5 (Hodgdon) for 2804 FPS (my load would be 43.5).
Can a fellow MSGO member run this through Quickload and tell me if I’m close? That would be 43.5 grains of H4895 in a Win case (trim to 2.005) with a CCI 200 primer and a 155 grain HPBT seated to 2.800 COAL in a 24” barrel. I’m trying to reach a muzzle velocity of 2800 FPS. Regardless, I plan on loading some more starting at 42 grains and going up in .5 grain increments to about 45 and testing them until I reach about 2800 FPS. Just may be awhile before I get to the range again.
 

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Discussion Starter #2
Range report: I ran three different length 155 grain HPBTs, each seated to a different COAL, with Win brass and loads of H4895 from 40-44 in 0.5 grain increments. The 155 grain bullets were all three different sizes; 1.130”, 1.200”, and 1.280” in length. The shorter bullets gave me between 2477 and 2790, the medium length bullets gave me between 2530 and 2796, and the long bullets gave me between 2540 and 2838. No loads were difficult to extract or resulted in flattened primers. In practical terms, I made it to 2800 fps with all three loads, but I'm going to settle for a less than max load of 43 grains for velocities in the range of 2722 - 2750.
 

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I don’t have Quickload but I load
H4895 43.4 grains
147 FMJ General Dynamics or Hornady 150 FMJ
CCI no 34 primer
COL 2.800

2,627 FPS from a 18” PSA LRAR 10 @ 84 degrees outside temperature

For comparison - factory ammo

Federal white box 149 FMJ XM80C was 2,682 (LC 2016)
M80 Ball PS 83 was 2,615

Note these are from an 18” barrel so slower than the longer barrel length from most load data. Out to 24” you can guesstimate 20-25 FPS per inch if trying to convert between 18” and test barrel length.
 

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Discussion Starter #4
Thanks for the info. I’m running 2720-2750 with these 155s and 43 grains of H4895. The seem fairly accurate.
 
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