Velocity and Hardness

[StarMetal]

VELOCITY REQUIRED TO EXPAND OR DEFORM VARIOUS HARNESSES MINIMUM BHN TERMINAL VELOCITY HOLLOW POINTS * 30-50 2400fps NR 202200 NR 181900 NR 14-15 1500NR 10 1400 900 fps 8 1300 800 5(pure lead) 1200 700

[StarMetal]

Well that posted terrible, I'll redo and post it another time

Joe

[StarMetal]

VELOCITY REQUIRED TO EXPAND OR DEFORM VARIOUS HARNESSES

MINIMUM BHN TERMINAL VELOCITY HOLLOW POINTS *

30-50 2400fps NR
20 2200 NR
18 1900 NR
14-15 1500 NR
10 1400 900 fps
8 1300 800
5(pure lead) 1200 700

Let's try this.

Joe

Well little better you get the point, first numbers are BHN, second the velocity they expand at and the NR means not recommended for Hollow Points except for varmint...not big game...too explosive and the velocity that is in that same column for hollow points is what velocity they expand at if they are hollow pointed for that BHN

[44man]

Star, looks good now. The first had me really scratching my head. Rifle shooters should make use of this. For the large calibers with large meplats, no expansion is needed. However, for a very heavy revolver boolit, a little expansion will not hurt because penetration will still be there.

[Bass Ackward]

This looks pretty close to my water testing results. But real world results can vary widely depending on meplat size, bullet diameter, and type of material impacted.

Just as an example, Dan's moose this year expanded 35 BHN at less than 1700 fps from a 357 Mag to well over 40 caliber.

[StarMetal]

I think well duh....wouldn't one think that if two bullets made from the same alloy and hardened to the same BHN, driven at the same velocity, BUT are two different diameters, say one .357 and one .452, would expand differently in the same medium? That chart is just a base line guide.

The "well duh" is no reflection on anyone here, on me actually.

Joe