Muzzle velocities in PCC's?

[Workin Man]

I recently bought a JR carbine in 40 S&W and I am planning on running it over a chronograph to see how the muzzle velocity compares to the published data in my reloading manuals and by ammo manufacturers. I am wondering if anybody else has done this already and if so, what were the results.

Thanks, Jim

 

[Yail Bloor]

http://www.ballisticsbytheinch.com/40sw.html

Great site.

 

[Workin Man]

Thanks for the link. It looks like only 100 to 200 fps increase for most loads (I only looked at 40 S&W and 9mm Luger). It also looks like there wasn't a huge gain from 12" to 18'' for most of the loads in 40. That makes sense I guess since they are intended for the most part for barrel lengths of 4" or 5'' or so. I have loaded up some rounds with 180gr bullet over Universal, which is the fastest burning powder listed for that load in my Hornady manual. I think I will try some with HS-6 as well (slower burning) and see if it makes more of a difference due to a longer burn time.

 

[Ganderite]

Thanks for the link. It looks like only 100 to 200 fps increase for most loads (I only looked at 40 S&W and 9mm Luger). It also looks like there wasn't a huge gain from 12" to 18'' for most of the loads in 40. That makes sense I guess since they are intended for the most part for barrel lengths of 4" or 5'' or so. I have loaded up some rounds with 180gr bullet over Universal, which is the fastest burning powder listed for that load in my Hornady manual. I think I will try some with HS-6 as well (slower burning) and see if it makes more of a difference due to a longer burn time.

Universal is about as good as it gets for the 40 with a 180 gr bullet.

 

[Workin Man]

Thanks for that advice Ganderite. |I will probably stick with the universal as my normal load, if that is the case. I do plan to try a few with the HS-6 anyway though, (I already have some on the shelf) just to satisfy my curiosity on how the burn rate will affect the velocity increase. This rifle will be just a plinker for me, just something to play around and experiment with, achieving higher velocities is not a priority ( just something I was curious about).

Thanks, Jim