302 Whisper

[Rikky Lee]

Yipeeee!! I shot a 3 shot 100 yard group that measured 0.483 inches center to center.

Velocity results posted soon.

[Rikky Lee]

With a velocity of 1140fps.

Happy.(Well happier!)

[Spook]

What powder was that Rikky?

[Rikky Lee]

Out of frustration I went to a pure pistol powder that I use for my 9mm with a burn rate equivalent to IMR SR 4756. Part of me wants to try a slightly faster powder again.

[Rikky Lee]

9.8 grains shoots well and accurately.

Forgot to take chrony so velocity test later.

Confirm a Sub MOA group at 100.

Still to chrony but the promise is showing.

Funnily enough the 10 grain load showed long vertical stringing but 9.8 and 10.4 don't....

[Rikky Lee]

So here we are - almost at the end of a long journey.

9.8 grains groups well and runs at 1046fps average with an SD of 26fps.

That will be the basis for a series of long range (100, 200, 300) tests and some field work.

Is that a light I see???

[HUNTER2]

Must have missed it...What powder are you using now?

[Rikky Lee]

SR4759 which is a faster burner than H110.

Pistol powders, heaviest bullet gives less air volume in the case - my original problem using the Lapua 200 subs.

[Expatriot]

Forget about the 220 grain SMK's you need to understand that in the subsonic world once you hit 1050+/- fps the only way to get more energy is through mass. I shoot the 300 Whisper with nothing but 240grain SMK's they by far have the best ballistic coeffient and are deadly on deer sized game down to squirels. If I could find some 250 grain SMK's I'd have to try them but they are out of production.

Have you ever had a subsonic bullet stop inside an animal?

If not then that bullet did not impart all of its "energy" inside the animal. Going to a heavier bullet is not going to increase the amount of energy imparted to the animal, all it will do is increase the amount of energy the bullet carries with it out the far side of the animal.

I did a bunch of terminal testing with 150gr subsonics and they penetrate to a huge degree. You are not getting any increase in terminal energy by using a bigger bullet.

[m21black]

No never had a 240 grainer not punch through end exit the deer but the 240 grain SMK with 1:8 twist are not as stable as the 150 grainer bullets that you are shooting. The 240 grainers tend to yawl over on contact thus they dump more enery and make nastier wounds...