311410 Single Choice Group Buy for .300 Blackout - Duke???

[Wasalmonslayer]

That’s perfect
So take the nose to .300 drop the overall diam to .309 take the just past crimp to .304 or.305

[jmort]

I agree that would be great
Now is time for any further input
I have none

[Wasalmonslayer]

Sounds good
Do we want smooth side gas check or lube groove gas check?

[Cord]

Glass half full, or half empty?

"So far only about half of them will handle a bullet that is north of .305 in front of the driving band."

Seems to me people are concentrating on the half that don't work- and ignoring the fact that half DO work.
That means some designs are very close already....and that it can be done.

And trying to please everyone with one design has been the obstacle so far...

So how about just going with a no lube groove boolit for starters?

A Lee FCD will put a crimp on it, so the crimp groove could be anywhere...or not there at all.
Gas check or plain base would both work...and that would be the main choice..

What remains is to design a nose that will feed and chamber in most rifles...
and I really appreciate those of you who can do that!

Just my .02, but I am ready to buy a mold just for the BO.

[jmort]

I think it really needs to have a gas check
Otherwise, agree

[Cord]

If there was no plain base option and only gas check...

I would buy it.

[Wasalmonslayer]

So no lube groove gas check or plain base option and set it at .304 and let pc build it back to fit.

[Wasalmonslayer]

Here is another run at it in a hi tek style with gas check.
To keep the weight down I had to shorten the bullet and narrow the meplate that lube goove was about 18grn worth of lead.
The balance looks really good at this point


Let me know if you want it heavier or lighter and any other thoughts???

Thanks
WS

[Wasalmonslayer]

Here is a hollow point addition let me know your thoughts please??

[Wasalmonslayer]

Here's plain base

[bluejay75]

Here's plain base

I would get one of these...6 Cavity PB brass...

[Cord]

It sure looks chubby on paper, but is just slightly shorter than the 311-410.
.740 for this one, and .800 for the 311-410.

But the meplat on this is smaller than the 311-410, 0.130 against 0.150.
HP pin at the mouth is
.115 for the 311-410
.075 for this one...

I was hoping it could have two hollow point pins, like the 311-410-
a deep hollow point pin and a shorter one.

Hard to see that with a meplat and pin this small.....

And I understand about keeping the weight down is why it's short and small...
.

[DAFzipper]

I have the M&P 311-410. In all my ar's the HP is damaged while chambering. The solid shoots well. I tried hot glue in HP. Worked well but a pia. Always thought a mould for a "tip" would be an awesome idea. Was thinking about trying to make one that would work with hot glue.

Sent from my LG-H700 using Tapatalk

[Wasalmonslayer]

I can widen the meplate and draw up any style pin you like or multiple. I just threw one together for sake of eye candy it’s not set in stone.
Are you happy with the weight or do you want lighter or heavier??

Like I said in a earlier post taking out the lube groove took it to just over 160 grains.

[Wasalmonslayer]

I want to draft the bullet you guys want so all you need to do is let me know the changes you would like.

Thank you
WS

[Cord]

Sorry, I didn't realize how much weight there was in the lube groove,
and how removing it would change the shape. I appreciate your work on this.

It now seems it might worth putting the lube groove back in just for weight reduction,
and hiding it in the neck, so to speak.

I have a 168 grain mold for .300 Savage I will dig out and measure to see how they did it....
The neck on .300 Savage is .220" long, shorter than the BO at .266"

Thanks.
.

[jmort]

The lube groove does make sense for the reasons stated by Cord
Micro-Grooves aka TL grooves are my favorite and take to PC and Hi Tek better
That is why all the Ranch Dog designs work so well for me
Still wanting a gas check and still prefer a crimp groove
But getting the crimp groove exactly right is a challange

[Wasalmonslayer]

So do you guys want to try multiple grooves or one?

Also I have experience using the lee crimp die to set the bullet where ever I need and get a good retention crimp.
This without a crimp makes sense that way it can be adjusted to fit many different chamber cuts.
Just my two cents

[Wasalmonslayer]

Here are a couple drawings with TL grooves and a hp version similar to the 311410

We can go back to a single groove it you guys would like too just let me know.

[Cord]

Nice, Wasalmonslayer, thank you.

There is another angle to this, jmort;

How fast do you want to push it?

A 130 grain gas check HP at 2100-2200 fps would be great,
but heavier at 140+ grains would top out slower, yes?

TL grooves are fine, weight reduction for speed
is my only reason for mentioning a standard groove.
.