As for what's best out of the Kahr PM9:
I'd go to Kahr's website, look at what kind of ballistic results they get in the gun tests that they link to.
Here is a test of the 147 grain HST:
Kahr 147 grain HST test
These are Federal 147 HST. All I can say is WOW! .599", and .624" expansion from a bullet only traveling at 927.5 and 929.9 fps with a penetration of 8 1/2" and 8 9/16" out of a 3" barrel. I guess that the longer score lines on the side of the bullet help with the expansion. If the formula to convert wet packs to FBI ballistic gelatin standards is accurate, I'd be happy with this round out of a 3" Kahr PM9 in my area's climate.
The expanded flower was so pretty that as a goof I used the expanded bullet to stamp a flower design on some old leather.
This is a nice low felt recoil round. It's true that the heavier 147 gr. have less felt recoil. It's a slower drawn out pulse.
http://usrange.org/smf/index.php?topic=2254.new;topicseen
Here is another:
Kahr PM 9 chronograph...
Hirtenberger 9mm 100gr. Truncated Soft Ponts Kahr PM 9 MM 3" Barrel:
1101 fps
1192 1192
1200 1200
1186 1186
1163
Federal 115Gr +P+ JHP's Kahr PM 9 MM 3" Barrel:
1085 fps
1165 1184
1131 1168
1163
Winchester Ranger STX 127Gr +P+ JHP's: Kahr PM 9 MM 3" Barrel:
1190 fps
1160 1124
1158 1139
1140
I'd be real surprised to see over 1200 fps, regardless of bullet weight, out of a 3" Kahr barrel.
At 1150 fps, a 9mm bullet with a .210 Meplat would give you a Wound channel diameter of 0.604" with a bullet with a meplat diameter of .210", and a striking velocity of 1150 fps.
At 950 fps, Wound channel diameter of 0.499" with a bullet with a meplat diameter of .210", and a striking velocity of 950 fps.
At 900 fps, Wound channel diameter of 0.473" with a bullet with a meplat diameter of .210", and a striking velocity of 900 fps.
I think I'll stay with the Federal in flat point and HST.
Don't see enough increase to make the added velocity worth the recoil.