I am about to work up some loads with Maxim CSB-1 (not a common powder, but I have access to barrels of it)
Using 180gr Berry's plated (I think they are Flat nose, but need to check)
My question is on velocity.  I am trying to figure where a reasonable warm 10mm velocity should be?

At a glance it looks like 10mm loads are about 100 FPS faster than .40. Is that correct?

I see some people  have pushed to 1390-1400 fps range; as the top end.
Does .40 cap out in the 1000fps area and a 10mm load end up in the 1150-1200fps range?
(I will be shooting from a smith 1006)

Underwood pushes the 40 S&W 180 grain loads to 1100 fps.  10mm loads for the same bullets get pushed to 1350 fps.

I generally accept that for any bullet weight 10mm should beat a 40 S&W by 200 fps or more at max loads in each respective cartridge.

That said, with a plated bullet you may exceed the abilities of the bullet before you reach 1350 fps.  1100 fps should be very doable.

Looking back at some of my data for Berry's TC 180 grain .400 I find a recipe using 6.7 grains of Unique loaded over Winchester large pistol primers in fired Starline brass loaded to 1.260" COAL.  That load averaged 967 from my Glock 29, 1042 from my Witness full size and 1035 from my Para Ordnance.  No pressure signs were noted. The extreme spread in Para was double the other two guns, though sample size was small at only 10 rounds each gun.

This load has lots of headroom, as a max load of Unique is 8.0 grains, so achieving 1150 fps should be pretty easy.

Much too fast for the Berry's .40/10mm bullets, FP's or HP's. They max out around 1050 FPS (higher .40SW velocity) in a rifled barrel, and only slightly higher in a hex bore. Ranier doesn't vary much from that. If you want to go that fast with a plated bullet, X-Treme are the only ones that would hold the plating. Other than that, you'll need true jackets or cast.

CSB-1 is a relatively fast (12 Ga.) powder, unlike to those typically preferred for higher velocity 10mm. Probably in a range Universal, a little faster than Unique. For comparison, .40SW 155 gr. JHP's max out about 1100 FPS with a 6.9 gr. charge. It's a good target powder, but I wouldn't use it for anything near high velocity 10mm. Probably well suited to the practical velocity of the Berry's bullets, though. I suggest starting at about 6 gr. and working up very carefully. This powder peaks very quickly. I strongly recommend running them over a chrono before making any conclusions. Velocity will plateau shortly before the overpressure leap (like other fast target powders). In other words, when velocities begin to diminish with charge increases, STOP. Nothing good happens after that.

When you study the 357 Magnum data which is very limited as well you will see it don't exceed the 40S&W data for this CSB-1 powder either.  The pressures are listed about where the 40 S&W are, while lower than the SAAMI max it will spike up quickly with a small increase from these numbers...

Be careful with your work up using this powder, I see you topping out at about 7.0 -7.2 grains for a 180 gr jacketed bullet in 10mm.

Here is some data I copied for study, that a person was testing, I cannot verify these findings;
CSB-1 with CCI 300 primers used
10mm  155 XTP          7.4gr    1262 vel
10mm  147 401-145   7.1gr    1221 vel
10mm  180 plated FN  7.1gr    1105 vel

Here is load data I have
6.3 was listed as tested in the Delta Elite with a 180 X-treme RBFB with Wolf LPP @ 1025 - 1054 fps

BE VERY CAREFUL!

Thanks Guys!
The rest of the story is:
I have a close friend that remanufactures .40, 9mm, and .45
He runs two camdex's and two 1050s to process brass

My plan was for me to work up a load for him to run thru his machines...
He buys a shit-ton (metric) of berry's and powder and has given me 3 gallons of processed 10mm brass.
He plans to buy a lot of starline and load new rounds and sell those as the market allows (sorta expand the product line)

I am just getting back into reloading as I just bought back all my reloading stuff from him; I did not even think about the plated brass limiting out.
I am not sure what jacketed bullets he/I can get for a reasonable price.
Realistically, I can switch powders and projectiles if I need; but if I can run what has barrels of sitting around; it helps keep the costs down.
But 10mm probably will not be m high volume shooting caliber either....
Maybe we should find some nice 180gr hollow points and market it as a range/defense round

Remington Ultimate Defense

Technical Information
Caliber: 40 S&W
Bullet Weight: 180 Grains
Bullet Style: Brass Jacketed Hollow Point
Case Type: Nickel Plated Brass


Ballistics Information:
Muzzle Velocity: 1150 fps
Muzzle Energy: 485 ft. lbs

Shadow

Those look like the numbers I posted at castboolits / north west firearms.

Using QL to model based on Universal ( later CSB-1 itself w/ QL update)  I worked up until velocity hit a wall and things got a bit nasty.

I now reserve CSB-1 for 115gr nines @ 1,050, were it's entirely suited.

Benchrst, They very well could be your numbers, as I was gathering info about this powder, from people who posted their results and searches from the web.  While this CSB-1 powder is available as a bulk product, it was a shotshell powder made by MAXAM Outdoors. http://www.maxamcomponents.com/
They produce a full line of products for shotshell industry...

I haven't had any to test with yet, but one day I just might...

I need to get some of the BE-86 loads tested that I'm working on.