wachtelhund
Junior Member
Daily driver, restored 27 year old Suzuki Samurai
Posts: 11
|
Post by wachtelhund on Feb 3, 2015 12:13:22 GMT -8
Hi Greg, This is kind of a continuation of my new member introduction. Question: does the BHW polygon rifling generate higher velocities than normal rifling? I studying the .65 Grendel load data and what little info is out there for the 6.5X6.8, it seems the BHW barrel are producing higher velocities per powder charge of equivalent Grendel loads. I have a H&K 630 in .223 Rem with polygon rifling and have noticed a similar increase of velocity from normal rifled barrels of the same length.
|
|
|
Post by GLSHOOTER on Feb 3, 2015 15:36:08 GMT -8
Hi Greg, This is kind of a continuation of my new member introduction. Question: does the BHW polygon rifling generate higher velocities than normal rifling? I studying the .65 Grendel load data and what little info is out there for the 6.5X6.8, it seems the BHW barrel are producing higher velocities per powder charge of equivalent Grendel loads. I have a H&K 630 in .223 Rem with polygon rifling and have noticed a similar increase of velocity from normal rifled barrels of the same length. The polygonal rifling produces less pressure on th bullet as it is not violently engraving like the Enfield standard rifling does. As a result we see higher speeds inch for inch than regular barrels. As an aside the smoothness of the barrel adds to the increase. Also you get less copper fouling across the board. We shoot equivalent data from other cartidges and our chronograph shows we are getting there with room to spare. We have several test runs with 20" barrels that are matching 24" velocities using the others loading data. I always figure we get a minimum of two inches extra velocity. I have a 26" 243LBC that I will be shooting at 1000 if my personal life ever gives me a break. The speeds will be humongous. Greg
|
|
wachtelhund
Junior Member
Daily driver, restored 27 year old Suzuki Samurai
Posts: 11
|
Post by wachtelhund on Feb 3, 2015 17:21:18 GMT -8
I thought that was the case when looking at the 6.5X6.8 Range Report and Grendel load data. I experienced similar results when chronographing my same handloads and shooting them out of my H&K 630, 16" polygonal rifled barrel vs. my AR-15, 16" barrel with normal rifling. At the time, I wasn't sure if it was due to the rifling or difference in bore diameter. I agree polygonal rifling does not fowl as much and is easier to clean. One of the features that made me order a BHW barrel. Shame I didn't know about BHW last spring. I built a light weight AR and was searching for a polygonal ultra light rifle barrel. Ended up with another brand barrel and a 5 pound AR, which has a PVS-4 Gen 3 permanently mounted on it.
|
|
|
Post by GLSHOOTER on Feb 3, 2015 17:37:38 GMT -8
Now that you found the barrels lock up your credit card. They are addicting. The bad thing is there are lots of exciting things on the horizon. . You have to try out a Savage tube too and round out your experiences.
Greg
|
|
wachtelhund
Junior Member
Daily driver, restored 27 year old Suzuki Samurai
Posts: 11
|
Post by wachtelhund on Feb 3, 2015 22:58:45 GMT -8
One build or project at a time. Have yet to get my hands on the first BHW barrel. In the last year, I've built one AR-15, one PVS-2 night vision scope from parts, restored and blued a Savage 219, a 100 year old Marlin 27-S .25-20 pump, a and a 116 year old double barrel shotgun for a museum. Also hand laid up a Carbon/Kevlar 28 oz. composite stock for my CZ 527 .223. And a H&R 700 .22 magnum, It had a bulged barrel from a jacket separation remaining in g the barrel. I re-barreled with a fluted GM .22 mag barrel re-finished and checked the original stock.
|
|
|
Post by GLSHOOTER on Feb 4, 2015 6:43:55 GMT -8
That is great work there. That stock is unreal.
Greg
|
|
wachtelhund
Junior Member
Daily driver, restored 27 year old Suzuki Samurai
Posts: 11
|
Post by wachtelhund on Feb 4, 2015 8:02:00 GMT -8
Thanks Greg, It came out 1 pound lighter than the factory stock and I had planned on painting a textured tan. But it absolutely blew my gunsmith away. He talked me into leaving it natural. So I sprayed it with some Duracoat UV Clear to protect the epoxy resin from the UV rays. This was done as a test, I plan on doing a thumbhole stock for my H&K 630 this year, only with a pourable, reusable mold this time.
|
|
|
Post by GLSHOOTER on Feb 4, 2015 8:14:40 GMT -8
I admire guys that can do that stuff. Of course having the time helps. I have found since I retired I have less of that than ever.
Greg
|
|
wachtelhund
Junior Member
Daily driver, restored 27 year old Suzuki Samurai
Posts: 11
|
Post by wachtelhund on Feb 4, 2015 9:05:33 GMT -8
I admire guys that can do that stuff. Of course having the time helps. I have found since I retired I have less of that than ever. Greg I hear that. Retired from the USAF in 1997 after 28 years. Relocated to WI in 2000, were I built my first house. It took me two years, doing almost all the work my self. Left the heating, air conditioning and most electrical to contractors. I have a finished walkout basement with a rifle range 30 yards from the house. Real convenient for working up loads. Between my hobbies (guns and hunting and a few others) and Chairman of Deutscher Wachtelhund North America, Inc., a rare German Hunting dog breed club, I don't have enough time either.
|
|