I have a few Facebook pages and a 10mm owner told me PBR's site has the V-Supreme ratings scaled back. Could be a misprint, but I'm trying to get Anthony for the straight dope. Until then I would hold off when this release in mid-May is announced. It may not be real 10mm! I'm trying to get a picture from the member of the box to verify. He's usually pretty good with getting back to me but hold your $$$ on buying until this is squashed.
I sent them an email over the weekend about the listed speed of the 200 grain V supreme load now being 1108 fps vs the 1250 it was when I last bought it. The owner got back to me in a day or so and said, It's a mistake on the website, the script that uploads it copies the wrong description from our database. It will be corrected this week and the V supreme loads are the same as always.
Good info! I'm glad that is all it is because they have a good future in 10mm ammo. It seems they caught on pretty good with everyone and make a nice product.
What's their chrono on the 200 grain XTP these days?
Expect 1200-1250 depending on the pistol.
Thanks.
All fixed! Here is the response I received:
It is a misprint, there was a bug in the script that grabbed product information from our database. It was grabbing the correct description but the wrong performance data. It has to do with the way the relationship between all the fields to create a listing was setup. I've fixed it and the performance data is now correct. Future refreshes from the database should take care of that problem. No downgrade from us.
And the specs listed on their site:
Velocity Supreme - 10mm 165gr FMJ
SKU: VS-10MM-165-FMJ
Brass Type: New
Caliber: 10mm Auto (Maximum Velocity)
Bullet Weight: 165 grains
Bullet Style: Full Metal Jacket
Test Guns: Glock G20 (4.6") / S&W 1006 (5.0")
FPS: 1342.5 / 1340.2
Power Factor: 221.5 / 221.1
Box Quantity: 50
Velocity Supreme - 10mm 180gr FMJ
SKU: VS-10MM-180-FMJ
Brass Type: New
Caliber: 10mm Auto (Maximum Velocity)
Bullet Weight: 180 grains
Bullet Style: Full Metal Jacket
Test Guns: Glock G20 (4.6") / S&W 1006 (5.0")
FPS: 1302.2 / 1296.9
Power Factor: 234.4 / 233.4
Box Quantity: 50
Velocity Supreme - 10mm 200gr FMJ
SKU: VS-10MM-200-FMJ
Brass Type: New
Caliber: 10mm Auto (Maximum Velocity)
Bullet Weight: 200 grains
Bullet Style: Full Metal Jacket
Test Guns: Glock G20 (4.6") / S&W 1006 (5.0")
FPS: 1249.7 / 1244.3
Power Factor: 249.9 / 248.9
Box Quantity: 50
How is the Glock getting better results than the 1006 if the 1006 has almost a half inch more barrel?
It's something in the straight cut rifling of the 1006 versus the Polygonal rifling of the Glock barrel. I get about dead equal out of my 4.75" Witness barrel as the 5" 1006 barrel in my tests too. It depends on the round a little but very close!
Quote from: Grim Reaper on May 09 2013 04:42:43 PM MDT
How is the Glock getting better results than the 1006 if the 1006 has almost a half inch more barrel?
i'm wondering about that too.....
As an example here is what I got from Remington 180gr's for an average:
Match 4.75" 1116.2 FPS/ 498 LBS
1006 5" 1105.62 FPS/ 489 LBS
About 11 FPS faster out of the Match in the shorter barrel. It's that way for many rounds but I think the 1006 shoots the Hardcast better.
and my Razorback also a 5" barrel shooting the same Remington ammo but it's a Polygonal 1134.8 FPS/ 515 LBS. It always shoots higher numbers than both as it should. I actually look at those numbers as actually done from their own test guns and correct. They must not be from Utah ;D
Yes, the Glock's polygonal rifling increases velocity somewhat.
I am surprised IC knew that, not being a Glock guy! :P
I don't own one but talk with a bunch of owners and have held a couple :P
It's also why my Match numbers compare but are a little faster ;D
So how do we convert the power factot to foot lbs? I guess I could look it up somewhere on the net.
It's listed on the stickied sheet. Roughly 679.
Quote from: Panzer on May 12 2013 04:32:54 PM MDT
So how do we convert the power factot to foot lbs? I guess I could look it up somewhere on the net.
Here's a very small excel spreadsheet to calculate it for you. Just input weight and velocity.
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Quote from: Intercooler on May 12 2013 05:00:27 PM MDT
It's listed on the stickied sheet. Roughly 679.
I thought of that this morning and was thinking to myself, "what an idiot"
Thanks for the reminder though. :'(
Quote from: Panzer on May 12 2013 04:32:54 PM MDT
So how do we convert the power factot to foot lbs? I guess I could look it up somewhere on the net.
Actually you can't.
Case in point.
A 200 grain bullet at 1000 fps will have the same power factor as a 100 grain bullet at 2000 fps. That power factor is 200 (mass X velocity/1000)
However, the energy of the two will be very different. In fact, the lighter bullet will have twice the energy of the heavier one (444 ft-lbs vs 888 ft lbs.
With ONLY power factor as an input you have no idea the energy of the round.
However, if you know the power factor and the bullet weight, or the power factor and the velocity, then you can derive the source variables of energy (mass and velocity) and calculate energy (mass X Velocity /450437).
--Mass is always in grains and velocity in fps for the above formulas.