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Post by onthedivide on Apr 7, 2019 14:51:28 GMT -8
I’m wondering what most of you think about pressure signs when you see them on your brass. I know it’s important to be safe but are there low level signs that are tolerated or not. For instance, slight flattening of primers or faint ejector swipes or occasional small craters. Are you backing off your powder charge at any signs or can some of this be safely tolerated ? This is in the AR platform that I’m referring to. I’m loading for a 264 LBC and a 223. I think that the 264 LBC is running at the upper limit of pressure for the AR15 platform and so pressure signs in that might be more critical. Tell me how you are handling this.
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Post by GLSHOOTER on Apr 7, 2019 15:05:30 GMT -8
Extractor and ejector mark's get most of my attention. I start looking hard at them but I also am looking at over gassing issues there too. Cratering unless it's due to a huge firing pin tunnel us not tolerated. I like my primers to have a bit of an edge to them. I don't want them looking like top hats when you deprive them.
I run a chronograph 100% during load work and have a grasp on reality for the speeds that are reasonable in a given loading even in my wildcats.
Greg
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Post by bigfoot on Jul 16, 2020 8:35:18 GMT -8
I just got my 338-06 ready for load development, it has a 26 inch black hole barrel. I tried R 16 first but I could not pack in enough powder to give me any signs of over pressure. Then I went to Ramshot Big Game with the same result, Western recommended max is 55 gr, I am up to 58gr with a 265 gr LR accubond bullet. I am going to chrono this load and see what the velocity is. What I had hoped to do was work up to max then back off for accuracy, I suspected this barrel was going to be faster and have less pressure than those used for testing by the powder companies but 3 grains over is making me a little cautious. Any suggestions from those who have more experience than I would be most appreciated. (any of you qualify as more experienced, I am new to this) I have 7 other rifles with BHW barrels and I will start reloading for them as soon as I shoot up the factory ammo. I suppose that the same issues will arise. (I hope)
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Post by GLSHOOTER on Jul 17, 2020 13:11:33 GMT -8
It is not the least bit unusual for a BHW polygonal tube to deliver faster than projected/published speeds at lower pressure signs as compared to an Enfield rifled barrel.
PM sent.
Greg
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Post by bigfoot on Jul 21, 2020 18:15:46 GMT -8
I had a few moments so I did a very short test firing 1 round each of the following.
200 grain accubond - 59 grains Big Game = 2820 fps nosler load data top velocity was 2690 improvement = 130 fps
225 grain accubond - 59 grains Big Game = 2750 fps " " " " " " 2595 " 155 fps
265 gr LR accubond - 58 gr BG (full case) = 2590 fps nosler only had data for 250 gr =2420 " 170 fps
This is with a brand new 26 inch barrel 338-06 and I feel certain that it will improve as it breaks in. Also I am showing no signs of over pressure so I may change to a wee bit faster powder to see if it might get that 200 grain pellet moving a little faster. Then I can start working on an accuracy load. This rifle is a little heavy to carry around all day but I am a meat hunter that hunts on private property and at 75 years old no one objects to me using my 2006 silverado diesel as a hunting blind. That long barrel and a little more weight really helps with the recoil, and you can shoot 5 rounds in rapid succession and the barrel is not overly warm. Gotta love these barrels.
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