I've always wanted a 10mm. I made the purchase of a Glock 20sf, but since I live in CA, it'll be awhile before I get to shoot it. In the meantime, I've been reloading for it and I have no intent of firing my reloads through the stock barrel. I'm purchasing a fully supported KKM barrel for it soon. With that said, I question some of the load data from the books and from some of the users that I've found on other forums. The bullet I'm using is 180gr. double plated (Xtreme Bullets). The powder is IMR 800-X. Below are the specs I've found from my reloading manuals:
Lyman 49th Ed.
Min: 6.8gr. Max: 8.4gr.
Lee 2nd Ed.
Min: 7.7gr. Max: 8.7gr.
Hodgdon
Min. n/a Max: 8.7gr.
Now, I've looked at some of the data on HandLoads website and some have loaded this same round up to 10.6 grains. That seems nuts. This specific users data shows he got 1,382fps with this 10.6 grain load with a JHP and noted: "NO adverse pressure signs BUT start 10% lower and work up to this load. Handgun used: Glock Model 20 w/standard 4.6" barrel & 24# recoil spring."
I've read about several people loading in the mid 9gr. range. I don't feel safe going beyond that the max is, BUT both the Lyman and Lee are very modest with their loads when it comes to .40 and 10mm and the pressure c.u.p. If I remember right, max pressure by SAAMI specs is 37,000. These books data pressures are in the mid 20,000's. Does this mean there's plenty more room to up the max grain? Why are they so modest with their loads when it comes to these calibers?
My whole point to all of this is... I own a .40. I love it, but I bought the 10mm cause I wanted something with more umph. I don't want to be loading the same exact bullet and shooting it at the same velocity, but out of a longer casing. I want to be able to feel the difference and it feel like a different gun. It seems like the books are keeping the 10mm at the same velocities as the .40, or at least very close to it. Anyone have any input on this? Thanks.
Lyman 49th Ed.
Min: 6.8gr. Max: 8.4gr.
Lee 2nd Ed.
Min: 7.7gr. Max: 8.7gr.
Hodgdon
Min. n/a Max: 8.7gr.
Now, I've looked at some of the data on HandLoads website and some have loaded this same round up to 10.6 grains. That seems nuts. This specific users data shows he got 1,382fps with this 10.6 grain load with a JHP and noted: "NO adverse pressure signs BUT start 10% lower and work up to this load. Handgun used: Glock Model 20 w/standard 4.6" barrel & 24# recoil spring."
I've read about several people loading in the mid 9gr. range. I don't feel safe going beyond that the max is, BUT both the Lyman and Lee are very modest with their loads when it comes to .40 and 10mm and the pressure c.u.p. If I remember right, max pressure by SAAMI specs is 37,000. These books data pressures are in the mid 20,000's. Does this mean there's plenty more room to up the max grain? Why are they so modest with their loads when it comes to these calibers?
My whole point to all of this is... I own a .40. I love it, but I bought the 10mm cause I wanted something with more umph. I don't want to be loading the same exact bullet and shooting it at the same velocity, but out of a longer casing. I want to be able to feel the difference and it feel like a different gun. It seems like the books are keeping the 10mm at the same velocities as the .40, or at least very close to it. Anyone have any input on this? Thanks.