Dummy check - 115gr swc @ 1.065 with 4.5gr N320 safe?

[TerryYu]

Before I go chrono this load, can anyone chime as to the safety of this load? I know it's getting pretty close to the limit as far as powder and OAL choice but I'm hoping someone has already loaded this up before!

I'll be shooting it out of a M&P Pro and a CZ 75 Shadow.

[frankie]

don't trust any data that's not from a manual. start light and work your way up.

safety, safety, safety.

[Hi-Power Jack]

What Frankie said.

Always start LOW and work up slowly with a chrono.

Too many possible problems with starting high -

OAL, accurate measuring of powder, your chamber, etc etc.

Be careful ....

[TerryYu]

Thanks. I'm starting out with 3.7, 4.0, 4.2, and then 4.5. Hopefully I'll get to PF before I hit pressure.

[DougCarden]

It is gonna be on the higher sign of velocity due to the lead bullet but you should be fine...seriously.

DougC

[TerryYu]

Thanks!

Just came back from the range with my chrono data, hope this helps anyone considering these bullets from Penn Bullets

115gr Penn Bullet SWCBB @ 1.06 COAL

http://www.pennbullets.com/9mm/9mmswcbb.html

S&W M&P Pro 5"

3.7gr N320

Low- 1079 High- 1097 Avg- 1086 ES- 18.2 SD- 7.68 n- 5

pf- 125

4.0gr N320

Low- 1082 High- 1163 Avg- 1127 ES- 81 SD- 40.5 n- 3 (chrono didn't pick up two shots)

pf- 129

4.3gr N320

Low- 1194 High- 1216 Avg- 1205 ES- 23 SD- 9 n- 5

pf- 138

CZ 75 Shadow

3.7gr N320

Low- 1062 High- 1083 Avg- 1072 ES- 21.7 SD- 10.3 n- 4

pf- 123

4.0gr N320

Low- 1120 High- 1145 Avg- 1134 ES- 25.8 SD- 10.7 n- 5

pf-130

4.3gr N320

Low- 1173 High- 1200 Avg- 1190 ES- 27.3 SD- 11.4 n- 5

pf- 137

Temperature - 52F

Barometer - 30.09in Hg

Winds - 15 mph (shielded behind berm)

So as you can see, I didn't have to touch 4.5gr to make PF. Didn't see any pressure signs at 4.3, but didn't feel like tempting fate by shooting the higher load as I had already made PF and then some.

I'll be going back with the 4.0gr load for accuracy testing in a day or two, it looks promising though, the round is very light in the gun. I just found out that my match ammo had been chrono-ing in at 140pf, so this load is like taking a vacation!

[mknpwr]

Hey Terry, enjoying life out there in the Air Force? Miss having you around here at PGC events.

Todd