|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
I know that he 264 win mag is a bit of a unique round to load for, especially with military surplus powder WC872. I have some loads that group great with nice velocities and no stiff bolt lift. But I am wondering how I could get the rounds tested to make sure I,m not exceeding pressure limits unknowingly... What say you?
|
|
|
|
|
Joined: Aug 2009
Posts: 2,794
Campfire Regular
|
|
Campfire Regular
Joined: Aug 2009
Posts: 2,794 |
I don't know about that but you can check your velocity against a good load book(s)and see how that shapes up. Also find out what is a close equivalent to wc872 and check the load book(s)for that. What info did you have to begin your load development?
By the time you get a sticky bolt lift, you're way in the red zone.
Aim for the exit hole.
|
|
|
|
|
Joined: Jan 2005
Posts: 38,850
Campfire 'Bwana
|
|
Campfire 'Bwana
Joined: Jan 2005
Posts: 38,850 |
I would imagine that the exact pressure in your rifle isn't going to match what is found elsewhere. The old York-Cantrell system still intrigues me.
Not a real member - just an ordinary guy who appreciates being able to hang around and say something once in awhile.
Happily Trapped In the Past (Thanks, Joe)
Not only a less than minimally educated person, but stupid and out of touch as well.
|
|
|
|
|
Joined: Oct 2004
Posts: 4,340
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2004
Posts: 4,340 |
I like stillbeemans answer and would add this....load a few casings 5xs and see if primer pockets stay snug. If you've done all that you're good to go.
|
|
|
|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
I don't know about that but you can check your velocity against a good load book(s)and see how that shapes up. Also find out what is a close equivalent to wc872 and check the load book(s)for that. What info did you have to begin your load development?
By the time you get a sticky bolt lift, you're way in the red zone. The label says to use starting loads for H870 and work up from there.
|
|
|
|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
I like stillbeemans answer and would add this....load a few casings 5xs and see if primer pockets stay snug. If you've done all that you're good to go. Krakky, is there any specific primers that seem to fit snugger than others?? Reloading cases for a second time. Out of 60 cases, 3-4 seemed awful easy to seat win mag primers. I wonder if these were top end work up loads??
|
|
|
|
|
Joined: Oct 2004
Posts: 4,340
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2004
Posts: 4,340 |
I haven't found any that are snugger but win primers seem looser. I guess it would be my idea to stick w/the same brand all the way through the test.
Those loose primer pocket shells...I'd be looking close for faint extractor marks on those....tilt em around in the light.....if they were enough to loosen primers they usually are enough to leave the faint circles.
|
|
|
|
|
Joined: Jan 2005
Posts: 38,850
Campfire 'Bwana
|
|
Campfire 'Bwana
Joined: Jan 2005
Posts: 38,850 |
I like stillbeemans answer and would add this....load a few casings 5xs and see if primer pockets stay snug. If you've done all that you're good to go. Krakky, is there any specific primers that seem to fit snugger than others?? Reloading cases for a second time. Out of 60 cases, 3-4 seemed awful easy to seat win mag primers. I wonder if these were top end work up loads?? They vary. It used to be that when the Winchesters were plated, they were the snuggest. Now they aren't. Used to be that CCIs seemed loosest, then they seemed thicker. To me, the snug primer thing (like most of the things that we used to rely on in loading) isn't all that good an indicator.
Not a real member - just an ordinary guy who appreciates being able to hang around and say something once in awhile.
Happily Trapped In the Past (Thanks, Joe)
Not only a less than minimally educated person, but stupid and out of touch as well.
|
|
|
|
|
Joined: Aug 2009
Posts: 2,794
Campfire Regular
|
|
Campfire Regular
Joined: Aug 2009
Posts: 2,794 |
What weight bullet? I have a Hodgdon book, kinda old, but it shows a max for 140gr bullet as 73grs with a velocity of 3163 and a pressure of 54,200cup
Aim for the exit hole.
|
|
|
|
|
Joined: Feb 2008
Posts: 1,491
Campfire Regular
|
|
Campfire Regular
Joined: Feb 2008
Posts: 1,491 |
Goggle HP White Labratories
|
|
|
|
|
Joined: Aug 2005
Posts: 1,741
Campfire Regular
|
|
Campfire Regular
Joined: Aug 2005
Posts: 1,741 |
Is this the takedown powder advertised as exactly the same as the old H870 or the take down listed as 20mm cannon of a more modern manufacture. But the same military designation.
The anti American Constitutional party (Democrat). Wants to dismantle your rights, limiting every aspect of your constitutional rights. Death by 1000 cuts is the tactic. Each cut bleeds constitutional rights to control you. Control is the goal.
|
|
|
|
|
Joined: Jun 2005
Posts: 12,317
Campfire Outfitter
|
Campfire Outfitter
Joined: Jun 2005
Posts: 12,317 |
http://www.hpwhite.com/Dunno if they'll test handloads from individuals or not but that's the only place I know of that pressure tests ammo. Paul B.
Our forefathers did not politely protest the British.They did not vote them out of office, nor did they impeach the king,march on the capitol or ask permission for their rights. ----------------They just shot them.
MOLON LABE
|
|
|
|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
Is this the takedown powder advertised as exactly the same as the old H870 or the take down listed as 20mm cannon of a more modern manufacture. But the same military designation. I am using the surplus powder WC872, label says to use starting loads for aa8700 and work up from there. I have had no trouble getting the 140's to about 3200 but just would love to see what pressures I am really running. I just don't want to get dangerous with it. And I have no desire to push it past 3200 fps. I think I may shoot 120's out of it as well and am wondering what velocity that should safely top out at. It is a very slow burning powder for sure. I am literally driving tacks with the 120 Barnes ttsx's.
|
|
|
|
|
Joined: Aug 2009
Posts: 2,794
Campfire Regular
|
|
Campfire Regular
Joined: Aug 2009
Posts: 2,794 |
If you're getting 3200fps with the 140's, I'd call it happy and stop there. In fact, I think I might back off a little.
Aim for the exit hole.
|
|
|
|
|
Joined: Oct 2004
Posts: 4,340
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2004
Posts: 4,340 |
How many inch barrel? I'll play w/quickload a little bit if you like.
Also..what brand of brass...is win a little roomier?
And...does the gun have any freebore?
Last edited by kraky111; 08/23/13.
|
|
|
|
|
Joined: Oct 2004
Posts: 4,340
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2004
Posts: 4,340 |
If you have a 24" barrel it would appear you ar living on the edge with a 3200 fps run with a 140. Almost every powder tops out at 3150 around 60-62k pressure. I sure don't like more pressure than that in the field. A little moisture in the barrel can jump things in the hurry.....or heat over and above where the testing was done. Cartridge : .264 Win. Mag.
Bullet : .264, 140, Hornady SST 26302
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Hodgdon H870
Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-10.0 96 67.95 2778 2400 42395 15024 94.9 1.463
-09.0 97 68.71 2815 2464 44021 15220 95.5 1.437
-08.0 98 69.46 2852 2528 45717 15407 96.1 1.412
-07.0 99 70.22 2889 2594 47487 15587 96.7 1.386
-06.0 100 70.97 2926 2661 49330 15758 97.2 1.362
-05.0 101 71.73 2963 2728 51240 15920 97.6 1.338
-04.0 102 72.48 2999 2797 53219 16073 98.0 1.314 ! Near Maximum !
-03.0 104 73.24 3036 2866 55277 16216 98.4 1.291 ! Near Maximum !
-02.0 105 73.99 3073 2936 57419 16350 98.8 1.268 ! Near Maximum !
-01.0 106 74.75 3110 3007 59648 16473 99.1 1.245 ! Near Maximum !
+00.0 107 75.50 3147 3079 61970 16585 99.3 1.223 !DANGEROUS LOAD-DO NOT USE!
+01.0 108 76.26 3184 3151 64387 16687 99.5 1.202 !DANGEROUS LOAD-DO NOT USE!
+02.0 109 77.01 3221 3224 66907 16777 99.7 1.180 !DANGEROUS LOAD-DO NOT USE!
+03.0 110 77.77 3257 3298 69533 16856 99.9 1.160 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 78.52 3294 3373 72271 16922 99.9 1.139 !DANGEROUS LOAD-DO NOT USE!
+05.0 112 79.28 3330 3448 75127 16977 100.0 1.119 !DANGEROUS LOAD-DO NOT USE!
Results caused by � 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 107 75.50 3321 3428 77409 15989 100.0 1.112 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 107 75.50 2900 2614 47609 16089 92.9 1.371
|
|
|
|
|
Joined: Jun 2011
Posts: 10,811
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Jun 2011
Posts: 10,811 |
H870 is quite a bit faster than WC-872. I'm shooting a 140 A-Max at 3230 and it's about 2 grains under where I found pressure.
The 140 SST has a really long bearing surface and IME shows pressure faster than other 140's
The people wringing their hands over Trump's rhetoric don't know what time it is in America.
|
|
|
|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
Kraky, I have a 26" barrel. And the 140 grain bullet I am playing with is Hornady Btsp's interlocks. I don't know how much freebore I have . But it's not the old original Winchester barrels that needed a 2 diameter bullet. I can comfortably seat -.050 off the lands. It is a custom Douglas 1-8" medium heavy barrel. Just fyi
|
|
|
|
|
Joined: Sep 2009
Posts: 429
Campfire Member
|
|
Campfire Member
Joined: Sep 2009
Posts: 429 |
Why spend thousands of dollars to have an independent lab work on reloads when you can do it yourself, any time you want? Don't be like everyone else and guess. Know. http://www.shootingsoftware.com/pressure.htm
You can piddle with the puppies, or run with the wolves...
Better living through chemistry!
|
|
|
|
|
Joined: Nov 2007
Posts: 4,902
Campfire Tracker
|
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 4,902 |
Thank you very much. This system is very interesting. I may just be worth investing in. Do you have this and does it work as advertised??
|
|
|
|
|
591 members (10ring1, 160user, 17CalFan, 007FJ, 1lessdog, 10Glocks, 67 invisible),
2,111
guests, and
1,143
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
Forums81
Topics1,191,098
Posts18,464,148
Members73,923
| |
Most Online11,491
Jul 7th, 2023
|
|
|
|
