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> superformance .308 load data?
superformance .308 load data?
@ 04:47 am (GMT) |
david rootHi all,First of all, let me say, Nathan, you say the mauser brothers nailed it, I say you nailed it my man ! Hell yeah, thanks for all you share! Ok, so im looking into superformance powder for my 308 savage model 10. I'm a lefty on a budget. I have some h4895 which is selling at the places that have it around $35 plus shipping and hazmat.places that dont have it are listing it cheaper ! Anybody say gouging !? Im seeing superformance at around $20 if ya buy 8pounders. And it seems more available. But i cant seem to find any load data ? A quick internet search shows nothin from hodgdon for 308 and guys sayin its a couple hundred fps slower, that hornady sf ammo is a different powder all togther and on and on. Are there two superformance powders ? Anybody have any load data for a 308? I'm shooting a 20" barrel and leaning towards the 178/180 gr a max and Speer. And partitions for close work. I live at 7600' but with shorter barrel and heavy bullets i'd love a little more get up and go ! Thanks |
Replies
@ 08:44 pm (GMT) |
Nathan FosterRe: superformance .308 load data?Thanks David.Superformance has to be blended but I have yet to determine how to properly blend it. I am assuming that the bulk of the load is superformance with the balance being a faster ball powder. But it could be the other way. So, I would suggets that you refrain from this until some idiot decides to throw caution to the wind and perform tests. My (idiot) experiments need to start around 40gr SF, then add X powder, 1 grain jumps during preliminary: 1gr 2gr 3gr e.t.c to 8.5 grains. Perform over two test sessions. Observe data and decide whether to increase or decrease SF content. Or change the fast powder. H335 to 414, quite a wide range to experiment with. I have some SF powder here but no fast Hodgdon ball powder at the moment. Without blending, SF is ideally suited to the 7mm Rem Mag and similar. This really caught me out a while back because I tested the factory ammo and was able to verify good speeds, was able to obtain the powder- but assumed I could achieve the same speeds as a matter of course. But I was quite wrong. |
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@ 09:52 pm (GMT) |
david rootRe: superformance .308 load data?Copy that, ill stick with the 4895. Thanks |
@ 09:02 pm (GMT) |
Ralph JuniusRe: superformance .308 load data?H4895 ia a great stick powder, but if you want "Super Performance" out of your .308 Win I suggest you try CFE 223. I loaded it behind 200 grain Nosler Partitions to a chronographed 2601 FPS average in my custom 26" barrel Stiller action rifle. I took the gun and ammo to Africa and took 7 large plains game animals including an old, large giraffe with it. All one shot kills at plus or minus 100 yards. If you check Hodgden load data you will see they list a 200 grain load in the high 2500's with a 24 inch barrel. Likewise they list a 150 grain bullet at nearly 3000FPS.BTW, the 4 recovered bullets didn't look like much. Even at a muzzle velocity of only 2600FPS all the lead in the front end was gone and the rear lead started to squeeze out of the rear end of two of them. Makes me wonder what a magnum would do to these bullets. Anybody have any recovered using a magnum? |
@ 09:58 pm (GMT) |
Warwick MarflittRe: superformance .308 load data?Just a thought. If you buy a box of SF and pop the bullet out . Recover the powder and look at the kernels with magnifying glass ( NOT IN THE SUNLIGHT ) or a microscope then maybe you can identify the different kernels used to make up the SF blend?Also How does kernel size affect powder burn rate? Could you grind some of the large kernels of a powder into a fine powder and have a blend of the two? Same parent powder just a different size. The density and surface area of the powder will have changed and I assume (DANGERIOUS) that the burning properties will have too. In what way only safe scientific testing will provide the answers. You will have to have the equipment and area to accurately measure and record the data. Is it worth the effort? Maybe just have to get 100 yards closer to the target the bullet will be going faster when it hits . |
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@ 11:33 pm (GMT) |
Nathan FosterRe: superformance .308 load data?The trouble is, the kernal size is the same throughout. It is the resistance within the deterrent coating that differs in this type of powder. |
@ 11:52 pm (GMT) |
Martin TaylorRe: superformance .308 load data?I think blending is an interesting ldea, fast powder with a little slower to continue the burn, but...........The way the powder settles in the case could have a big effect on the way it ignites through the powder column, pressures may vary all over the place. I know we are talking small amounts of powder though. We learnt about the basics of this during my explosives training, detonators and placement, voids, charge shape etc. Interesting mmmmmm, yes............ |
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@ 01:55 am (GMT) |
Warwick MarflittRe: superformance .308 load data?Ah yes the Kernels 11 secret coatings of Nitroglycerin and SF spices. Let me Arseume that the pressure effects the chemical reaction too. The thing is that the answer is already known by the Powder Geeks in the SF KITCHEN. Chicken anyone? |
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@ 02:08 am (GMT) |
Warwick MarflittRe: superformance .308 load data?Ment to say Nitro Chicken anyone? Hang on to it coz it kinda kicks a bit!http://youtu.be/nPvfXAvjBM0 |
@ 12:31 am (GMT) |
Eloy VilavellaRe: superformance .308 load data?I tried a few recipes and could not find the superformance secret formula so if anyone has any ideas let me know. I will not mix powders. not worth the risk for me.I also shoot buffalo bore so if I could get a hold of their recipe I would love it. 2710 fps - Kimber 84 Montana, 22 inch barrel https://www.buffalobore.com/index.php?l=product_detail&p=262 The closest I get is with 45.3 grains of accurate 2520 and 180gr speer BTSP + lapua palma brass and a 24" BB. It is a very hot load. If needed, either one, will pop all North American large game w/o exception. |
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