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17HMR Velocity test results
gunnut505
Member Posts: 10,290 ✭
Found this on the 'net;
Bullberry Barrel Works
2430 W. Bullberry Lane
Hurricane, Utah 84737
(435) 635-9866
fax: (435) 635-0348
email Bullberry
17 HMR Velocity Tests
These tests were performed April 20, 2002 in the Bullberry Test Pit using a Dr. Oehler Sky Screen Chronograph Model 33
with Shyscreen III system. The first screen was set 6 feet in front of muzzle. Screens are spaced EXACTLY 10 feet apart.
The test was on a new production 17 HMR Bullberry bull barrel 22" long. The purpose was to determine velocities at this
length, and every inch shorter down to the practical minimum length of 10". After each group of 5 shots, we cut the
barrel by one inch and repeated the velocity test until we had reached our goal of 10".
I had predicted a higher velocity than currently reported from the Ruger and Marlin rifles, based on our tighter
tolerance chambers. While this did not occur, it did prove my other theory that we would possibly see a maximum velocity
in the 17 or 18 inch range. You'll see that it actually occured at 19" in our test.
Further was the HUGE surprise, in that the short pistols have a velocity so near the carbine. Our early accuracy test
barrel in stainless shot only 132 fps slower that the uncut 22" blued chrome-moly carbine. When we finished the test
at the 10" length, we found the chrome-moly barrel to be only 241 fps slower than the 22 inch length. And for some
reason, unexplainable, the stainless barrel shot a bit faster than its counterpart in blued CM.
So on to the test velocities:
22 inch barrel
Shot 1 2517 fps
Shot 2 2472 fps
Shot 3 2508 fps
Shot 4 2515 fps
Shot 5 2575 fps
Average 2517 fps
Spread 103 fps
21 inch barrel
Shot 1 2560 fps
Shot 2 2494 fps
Shot 3 2494 fps
Shot 4 2522 fps
Shot 5 2543 fps
Average 2523 fps
Spread 66 fps
20 inch barrel
Shot 1 2570 fps
Shot 2 2484 fps
Shot 3 2500 fps
Shot 4 2500 fps
Shot 5 2522 fps
Average 2515 fps
Spread 86 fps
19 inch barrel
Shot 1 2548 fps
Shot 2 2520 fps
Shot 3 2491 fps
Shot 4 2557 fps
Shot 5 2574 fps
Average 2538 fps
Spread 83 fps
18 inch barrel
Shot 1 2538 fps
Shot 2 2507 fps
Shot 3 2525 fps
Shot 4 2542 fps
Shot 5 2501 fps
Average 2522 fps
Spread 41 fps
17 inch barrel
Shot 1 2524 fps
Shot 2 2483 fps
Shot 3 2495 fps
Shot 4 2498 fps
Shot 5 2526 fps
Average 2505 fps
Spread 43 fps
16 inch barrel
Shot 1 2526 fps
Shot 2 2474 fps
Shot 3 2486 fps
Shot 4 2504 fps
Shot 5 2473 fps
Average 2492 fps
Spread 53 fps
15 inch barrel
Shot 1 2473 fps
Shot 2 2464 fps
Shot 3 2490 fps
Shot 4 2491 fps
Shot 5 2469 fps
Average 2477 fps
Spread 27 fps
14 inch barrel
Shot 1 2446 fps
Shot 2 2398 fps
Shot 3 2427 fps
Shot 4 2468 fps
Shot 5 2423 fps
Average 2432 fps
Spread 70 fps
13 inch barrel
Shot 1 2431 fps
Shot 2 2427 fps
Shot 3 2431 fps
Shot 4 2399 fps
Shot 5 2406 fps
Average 2419 fps
Spread 32 fps
12 inch barrel
Shot 1 2394 fps
Shot 2 2391 fps
Shot 3 2359 fps
Shot 4 2423 fps
Shot 5 2366 fps
Average 2387 fps
Spread 57 fps
11 inch barrel
Shot 1 2358 fps
Shot 2 2332 fps
Shot 3 2336 fps
Shot 4 2349 fps
Shot 5 2313 fps
Average 2338 fps
Spread 45 fps
10 inch barrel
Shot 1 2273 fps
Shot 2 2256 fps
Shot 3 2301 fps
Shot 4 2282 fps
Shot 5 2268 fps
Average 2276 fps
Spread 45 fps
Summary: This 10" barrel produced velocity average of only 241 fps slower than the 22" length, and only 262 fps less
than the best average of the 19" length.
All 5 shot groups were shot after a damp patch of Eezox was pushed through the bore. This was done to clean out any
metal particles from the cutting operation and to assure a clean bore for each group.
Back to the 17 HMR page.
If you've had the patience to stick with us through this process, here's a deal. The first one to call with a credit
card number in hand can buy this test barrel with just 67 shots through it. 65 recorded, plus 2 "errors." This is
priced at our standard price of $278.
Since this barrel must now have a bench rest crown added, it will require reblueing. If the buyer chooses, we'll mark
it with a special inscription, indicating it was the Bullberry velocity test barrel. This would only take approximately
10 days until shipment.
Thanks,
Fred Smith @ Bullberry/Woodsmith
fred@bullberry.com
Win $100 | This Month's Winner | Past Winners | Specials
Barrels | Stocks | Custom Guns | Accessories | Loading Data | About Bullberry | Guarantee
c 2003 Bullberry Barrel Works
If you know it all; you must have been listening.<br>WEAR EAR PROTECTION!
Bullberry Barrel Works
2430 W. Bullberry Lane
Hurricane, Utah 84737
(435) 635-9866
fax: (435) 635-0348
email Bullberry
17 HMR Velocity Tests
These tests were performed April 20, 2002 in the Bullberry Test Pit using a Dr. Oehler Sky Screen Chronograph Model 33
with Shyscreen III system. The first screen was set 6 feet in front of muzzle. Screens are spaced EXACTLY 10 feet apart.
The test was on a new production 17 HMR Bullberry bull barrel 22" long. The purpose was to determine velocities at this
length, and every inch shorter down to the practical minimum length of 10". After each group of 5 shots, we cut the
barrel by one inch and repeated the velocity test until we had reached our goal of 10".
I had predicted a higher velocity than currently reported from the Ruger and Marlin rifles, based on our tighter
tolerance chambers. While this did not occur, it did prove my other theory that we would possibly see a maximum velocity
in the 17 or 18 inch range. You'll see that it actually occured at 19" in our test.
Further was the HUGE surprise, in that the short pistols have a velocity so near the carbine. Our early accuracy test
barrel in stainless shot only 132 fps slower that the uncut 22" blued chrome-moly carbine. When we finished the test
at the 10" length, we found the chrome-moly barrel to be only 241 fps slower than the 22 inch length. And for some
reason, unexplainable, the stainless barrel shot a bit faster than its counterpart in blued CM.
So on to the test velocities:
22 inch barrel
Shot 1 2517 fps
Shot 2 2472 fps
Shot 3 2508 fps
Shot 4 2515 fps
Shot 5 2575 fps
Average 2517 fps
Spread 103 fps
21 inch barrel
Shot 1 2560 fps
Shot 2 2494 fps
Shot 3 2494 fps
Shot 4 2522 fps
Shot 5 2543 fps
Average 2523 fps
Spread 66 fps
20 inch barrel
Shot 1 2570 fps
Shot 2 2484 fps
Shot 3 2500 fps
Shot 4 2500 fps
Shot 5 2522 fps
Average 2515 fps
Spread 86 fps
19 inch barrel
Shot 1 2548 fps
Shot 2 2520 fps
Shot 3 2491 fps
Shot 4 2557 fps
Shot 5 2574 fps
Average 2538 fps
Spread 83 fps
18 inch barrel
Shot 1 2538 fps
Shot 2 2507 fps
Shot 3 2525 fps
Shot 4 2542 fps
Shot 5 2501 fps
Average 2522 fps
Spread 41 fps
17 inch barrel
Shot 1 2524 fps
Shot 2 2483 fps
Shot 3 2495 fps
Shot 4 2498 fps
Shot 5 2526 fps
Average 2505 fps
Spread 43 fps
16 inch barrel
Shot 1 2526 fps
Shot 2 2474 fps
Shot 3 2486 fps
Shot 4 2504 fps
Shot 5 2473 fps
Average 2492 fps
Spread 53 fps
15 inch barrel
Shot 1 2473 fps
Shot 2 2464 fps
Shot 3 2490 fps
Shot 4 2491 fps
Shot 5 2469 fps
Average 2477 fps
Spread 27 fps
14 inch barrel
Shot 1 2446 fps
Shot 2 2398 fps
Shot 3 2427 fps
Shot 4 2468 fps
Shot 5 2423 fps
Average 2432 fps
Spread 70 fps
13 inch barrel
Shot 1 2431 fps
Shot 2 2427 fps
Shot 3 2431 fps
Shot 4 2399 fps
Shot 5 2406 fps
Average 2419 fps
Spread 32 fps
12 inch barrel
Shot 1 2394 fps
Shot 2 2391 fps
Shot 3 2359 fps
Shot 4 2423 fps
Shot 5 2366 fps
Average 2387 fps
Spread 57 fps
11 inch barrel
Shot 1 2358 fps
Shot 2 2332 fps
Shot 3 2336 fps
Shot 4 2349 fps
Shot 5 2313 fps
Average 2338 fps
Spread 45 fps
10 inch barrel
Shot 1 2273 fps
Shot 2 2256 fps
Shot 3 2301 fps
Shot 4 2282 fps
Shot 5 2268 fps
Average 2276 fps
Spread 45 fps
Summary: This 10" barrel produced velocity average of only 241 fps slower than the 22" length, and only 262 fps less
than the best average of the 19" length.
All 5 shot groups were shot after a damp patch of Eezox was pushed through the bore. This was done to clean out any
metal particles from the cutting operation and to assure a clean bore for each group.
Back to the 17 HMR page.
If you've had the patience to stick with us through this process, here's a deal. The first one to call with a credit
card number in hand can buy this test barrel with just 67 shots through it. 65 recorded, plus 2 "errors." This is
priced at our standard price of $278.
Since this barrel must now have a bench rest crown added, it will require reblueing. If the buyer chooses, we'll mark
it with a special inscription, indicating it was the Bullberry velocity test barrel. This would only take approximately
10 days until shipment.
Thanks,
Fred Smith @ Bullberry/Woodsmith
fred@bullberry.com
Win $100 | This Month's Winner | Past Winners | Specials
Barrels | Stocks | Custom Guns | Accessories | Loading Data | About Bullberry | Guarantee
c 2003 Bullberry Barrel Works
If you know it all; you must have been listening.<br>WEAR EAR PROTECTION!