Berger Reloading Info - 215gr Hybrid

[DocB]

I've received my Berger 215gr hybrids and I'm trying to make an intelligent start at working up my loads, at least on paper and logistically, so when I get home I can get started.

I've narrowed down my powder choices to 3 based on recommendations and readings here on this site. I figure, based on availability, I'll use H-Retumbo, H-1000, and IMR-7828SSC and buy 1 lb of each and see what works best for me.

So I wrote the wonderful folks at Berger and they provided me with the information in the chart below.

300 Winchester Magnum

Bullet/Powder/Start Load/Apprx Start Velocity/Max Load/Apprx Max Velocity/Fill Ratio

215
Grain / VIHT N165 / 65.0 / 2530 / 68.3 / 2650 / 95.0%

215
Grain / RE-22 /66.0 / 2653 / 69.6 / 2790 / 95.0%

215
Grain /IMR 7828 SSC / 66.5 / 2674 / 69.9 / 2809 / 94.0%

215
Grain / RE - 25 / 68.5 / 2669 / 72.0 / 2795 / 100.0%

215
Grain / H1000 / 70.5 / 2632 / 74.0 / 2772 / 103.0%

215
Grain / NORMA MRP 2 /70.0 / 2645 / 73.8 / 2793 / 102.0%

215
Grain / RamshotMagnum / 72.0 / 2667 / 76.0 / 2830 / 93.0%

215
Grain / RETUMBO / 74.0 / 2686 / 77.9 / 2836 / 107.0%

215
Grain / AA 3100 / 65.5 / 2571 / 69.0 / 2698 / 101.0%

215
Grain / VIHT N160 / 63.0 / 2521 / 66.0 / 2630 / 95.0%

215
Grain / IMR 4831 / 60.5 / 2589 / 63.5 / 2693 / 91.0%

215
Grain / H4831 SC / 65.0 / 2598 / 68.7 / 2740 / 94.0%

215
Grain / IMR 4350 / 60.5 / 2583 / 63.5 / 2690 / 88.0%

215
Grain / VIHT N170 / 71.0 / 2575 / 75.0 / 2669 / 105.0%

215
Grain /AA MAGPRO / 69.5 / 2657 / 73.4 / 2812 / 95.0%

215
Grain / NORMA MRP / 66.0 / 2647 / 69.5 / 2780 / 92.0%


I'm tracking pretty much all of the data except I hit a snag when analyzing the "Fill Ratio" column. If I'm following correctly, this figure would represent the percentage of the case capacity utilized with the load indicated at max.

Now the part that's got me a bit confused are the percentages which exceed 100%. Am I to assume where loads are in excess of 100% are ones in which the base of the bullet is pressed into and surrounded by the powder charge?

I'd appreciate some clarification and education on this please.

Thanks,

DocB

 

[FEENIX]

Use the custom search on the top right corner; there are plenty of information about the bullet and chambering on your query.

Good luck!

 

[DocB]

Use the custom search on the top right corner; there are plenty of information about the bullet and chambering on your query.

Good luck!

Ok, thanks!

DocB

 

[tomt]

It appears Berger is using Winchester cases in their filling ratio. Quickload has Winchester @ 93.8 grains of h2o, Remington @ 88.0 grains of h2o, Federal @ 92.0 grains of h2o. They have "N" (Norma or Nosler) @ 95.5 grains of h2o. The Remington cases could hit max pressure before before max charge.