Guidance with new bullet...

[bear_blade]

Hey, I just picked up a couple boxes of new bullets from a newer company called Matrix bullets. These are 210 gr, .308 cal. you can find them here http://matrixballistics.com/.308-Caliber-rifle-bullets.html

These have a static BC of .7525 and look very promising. I have a .308 custom, built on a Savage action, 28" McGowen match heavy contour barrel, 1 in 10 twist, in an XLR industries stock.

I have not as of yet, loaded anything over 180 grains, and am looking for guidance.

I found an old thread here talking about 208 gr A-Max, and 210 gr Bergers, useing RL 17, pushing up to 51 grains of powder, and getting velocities nearing 2700 fps. This thread appeared to be experimental, and I am interested in the initial reports for sure. I can't seem to find any published load data using this combo, and am looking for confirmation on the data, as well as seeing what you might be useing. Not asking for specifics, but maybe a ballpark range to work in.

I am useing new Laupa brass.

Thanks in advance.

 

[turbo54]

Re: Guidance with new bullet...

What cartridge are we talking about here??? I'm under the impression we're talking 308 Win - if thats the case I just dont know about 2700fps!! If I can send a bullet with a .7xx BC out of my 308 at 2700ish fps, I'm going to cancel my 260 build!

That said, Im looking at the Litz book right now and there is a Matrix 210 VLD with G1 BC of .637 average. Its bearing length is .512". The Hornady Amax 208 bearing length is .555". The Sierra 210SMK bearing length is .541".

Equal mass with less bearing length generally means higher safe max charge. You should be safe to start at the low end of those bullets' published charges.

 

[BBeyer]

Re: Guidance with new bullet...

Expensive little beauties arnt they,

 

[bear_blade]

Re: Guidance with new bullet...

.308 Win is correct. In this thread http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=1135344
they show velocities with RL 17 to 2600 and change
this thread, 2650ish

I haven't seen a lot since then, and am still reading the search results. I know testing is testing, but thought I would ask the pros, if RL 17 or N550 for that matter would be the powders of choice to push the velocities.

 

[bear_blade]

Re: Guidance with new bullet...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BBeyer</div><div class="ubbcode-body">Expensive little beauties arnt they, </div></div>

For performance, I think its an OK compromise!

I need to get out to the range, but work is sucking the life out of my fun time.

 

[BBeyer]

Re: Guidance with new bullet...

I know what you mean, I worked for 40 years, now that I am retired I just wish things didn"t hurt like they do when I try to do something.
How much are over the counter bullets going for these days? Havnt bought any in a while.

 

[bear_blade]

Re: Guidance with new bullet...

Up here the preimum stuff is pushing $50 for a box of 20

 

[jbailey]

Re: Guidance with new bullet...

one thing to remember w/ a mono bullet -- they are long. Which means you don't have as much cartridge capacity to work with, as the long bullet boat tail and base are seating deep inside it. As such, you can't get them moving as fast as you would a jacketed bullet. Also, the long bearing surface on most monos again slows them down.

With this in mind, I don't think you can safely move them at 2650 out of a 308Win, not if you want to reuse the brass. I did know a guy that was moving 208 Amaxs out of a 308Win at 2650 (26") using RL17, but it was very hard on the brass (he had all sorts of pressure signs). He also got all sorts of crazy temp variations with his loads (was using it to shot Fclass, which isn't good for 1000yds performance).

Good luck with them! If that BC is anywhere near correct, you have a good combo going, even if its going 2550 at the muzzle.

 

[bear_blade]

Re: Guidance with new bullet...

I have reloaded for years, even for hunting, I want the most I can get out of my rifle, and have been able to beat any store bought fodder I have tried.