Thread: Sig 357 flash hole

More than likely Speer uses high grade low flash powder in their premium ammunition would be my guess.

The reply from Speer, still no real info as to why the hole is smaller???? Not a real answer Speer, seems like you guys are beating around the bush..

"The design and performance are credited to the engineer and we feel we make the best 357 Sig duty product a shooter can get. Small flashhole, high output primer and a bullet designed for the 357 Sig and not the 9mm combine to give superior performance".

Speer did answer your question, and quite completely too.
They wrote, in part: "Small flashhole, [and a] high output primer...designed for the 357 Sig and not the 9mm combine to give superior performance..."

The smaller flash-hole, used with a high-output primer, "squirts" hot fire right into the middle of the powder charge, permitting the use of propellants better suited to the specific cartridge.
The smaller flash-hole might also be a requirement of using a faster-burning propellant, the smaller diameter reducing back-pressure into the case's primer pocket.

Yep, I agree with Steve 100%. Evidently Speer has engineered all the right elements to obtain the small flash whole w/ superior performance in .357 sig. BK, if you loaded, or had experience in reloading your own ammunition it would make more sense to you. A high grade low flash faster burning propellant , high output primer, bullet specifically designed for the .357 Sig are all elements. Ammunition manufacturers are in very high competition w/ one another(especially for LE contracts), they are not going to give you all of their highly detailed secrets of their engineers and evidently there is no one answer, but a combination of the elements Steve described. Like making the perfect cake so to speak.

Steve

Thank you. You provided a more direct an understandable reason. Such as fire Into the middle of powder charge...I was looking for more detail, I see its the same for the 6.5 round....thanks

The brass is from a federal agency, and I have a load of it. Just getting back into reloading an pulling the webs off my dillon 650, I was surprised about the small falsh hole since this was the first time for me running into this....

Denner

I do reload but stepped away for a few years. Just starting back an ran into the small flash hole, first time reloading 357 sig. I admit I have some catching up to do....lol

Thanks for the info guys.