700X powder???

[mikemmcd]

I just purchased the Rainier 165gr FP plated bullets to load for my 40 S&W Glock 23. I am looking for loading data for use with IMR 700X powder. I also plan to use Titegroup powder.

[Rocky Raab]

Not only Glock but virtually all the reloading supply companies warn against reloading for the Glock in 40 S&W. That's because the Glock barrel leaves the cartridge partially unsupported in the chamber. Case bulging or rupture can occur with once-fired cases (and have!)

That being the case, I won't offer any load data.

[mikemmcd]

I am well aware of that fact but I purchased a storm lake aftermarket barrel for my Glock and it has fully supported chamber.

[Ak_Red]

Is this just a Glock thing? Or is it all 40 S&W? I have a Taurus PT-100 I was planning on reloading for. I had a Beretta Model 96 once upon a time and it bulged the brass on the back end. I have not noticed that with the PT-100.

David

[mikemmcd]

mainly Glock. Can happen on others if not fully supported. I decided to buy an aftermarket barrel that is fully supported before I attempt to fire reloads and lead bullets.

[Evan03]

whoever makes 700x powder will more than likely have load data on there website. but like rocky said they may not have info on the internet for all to see.

[Rocky Raab]

Ah, I see.

I've found that plated bullets are a bit like a hybrid between a bare lead bullet and a jacketed one. They're not quite as hard as a jacketed one, so they obturate up to full bore diameter when fired, BUT they have the higher friction coefficient of a jacket, so it pays to keep loads mild with plated bullets.

My handbook from IMR doesn't list data for 165 grainers, but due to the above-noted condition regarding plated bullets, let's look at the data for 180-grain TMJs.

IMR 700x 4.6 gr 970 fps 34.6K psi

That's a MAX load. If you use the usual 10% reduction, a start load would be about 4.0 grs. I think I'd try a few at 4.0 and call it good.

Just a guess, but I'd wager you'd be getting right at 900 fps with the slightly lighter bullet - just about perfect for a practice/plinker/small game load.

NOTE FOR OTHERS - Do NOT fire reloaded .40 S&W rounds in any Glock pistol with the factory barrel, or any other pistol that does not have a fully supported chamber. If in doubt, check with the manufacturer, or use factory ammo only,

[mikemmcd]

Thanks for the info. I just purchased a storm lake barrel for my Glock that does have fully supported chamber. I should be ok