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> Different brass
Different brass
@ 02:47 am (GMT) |
Greg WhorlowHello all, I have a question or a statement about using different brass when reloading. I understand that Nathan says that when changing brass brands you will have to work your loads up due to different case capacity and brass harness.I just got back after some more work on my 150 grain Nosler partitions being fired through a 270 Winchester using ADI 2209 (H4350). As I am new to reloading I have been working up my loads from the book minimum of 46 grains (ave speed 2548 f/s, ES 89 f/s) through to the book maximum of 49 grains (ave 2682, ES 9 f/s) with the target load being 2900 and less than 1 MOA. I am only planning to hunt out to 300 metres for Fallow, Red and the occasional Sambar when out east so going further load development was not seen as a priority. I have since worked up loads to 54.5 grains with an average of 2815 f/s and ES of 11, first 2 rounds touching and the third 1.1 inches up to the left (I think I get excited about getting such a good group and pull the third shot). I was happy enough with this load and was going to call it quits, but I had another 3 rounds loaded at 55 grains so I fired them off. I got the exact same POI on paper, that third shot being high again. The difference was that speed had picked up to ave 2915 and ES of 53. When checking the cases for signs of overpressure (there were none, they all looks really good) I noticed I had used Remington brass (by accident) all other loads had been with Norma. My question is, there was the .5 grain increase in powder which in all previous loads have given an increase in bullet speed of between 10 to 50 f/s. Is the different brand of brass the reason for this and is this typical of the increase you could expect? (Nathan states the Norma brass can be soft). Is this load deemed to be “safe”, it is going very quickly for a 150 grain projectile in a 270, as said the brass looked fine and the primmer (CCI) looked no different to slower loads. Is the third shot being an inch out typical of a new(ish) shooter getting a bit excited or is there something else going on? I leave the gun to cool for 8 minutes between each shot and as far as I can tell there is no other variables. I look forward to your replies and keeping you up to date with the upcoming rut and roar in Western Victoria, Australia. Thanks Greg |
Replies
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@ 02:56 am (GMT) |
Greg WhorlowRe: Different brassAll, this message is a little easier to read and understand than the one above, I should have done some proof reading before posting!Hello all, I have a question or a statement about using different brass when reloading. I understand that Nathan says that when changing brass brands you will have to work your loads up due to different case capacity and brass harness. I just got back after some more work on my 150 grain Nosler partitions being fired through a 270 Winchester using ADI 2209 (H4350). As I am new to reloading I have been working up my loads from the book minimum of 46 grains (ave speed 2548 f/s, ES 89 f/s) through to the book maximum of 49 grains (ave 2682, ES 9 f/s) with the target load being 2900 and less than 1 MOA. I am only planning to hunt out to 300 metres for Fallow, Red and the occasional Sambar when out east so going further load development was not seen as a priority. I have since worked up loads to 54.5 grains with an average of 2815 f/s and ES of 11, first 2 rounds touching and the third 1.1 inches up to the left (I think I get excited about getting such a good group and pull the third shot). I was happy enough with this load and was going to call it quits, but I had another 3 rounds loaded at 55 grains so I fired them off. I got the exact same POI on paper, that third shot being high again. The difference was that speed had picked up to ave 2915 and ES of 53. When checking the cases for signs of overpressure (there were none, they all looks really good) I noticed I had used Remington brass (by accident) all other loads had been with Norma. There was the .5 grain increase in powder which in all previous loads has given an increase in bullet speed of between 10 to 50 f/s. My question is, is the different brand of brass the reason for the 100 f/s speed increase and is this typical of the increase you could expect? (Nathan states the Norma brass can be soft). Is this load deemed to be “safe”, it is going very quickly for a 150 grain projectile in a 270, as said the brass looked fine and the primmer (CCI) looked no different to slower loads. Is the third shot being an inch out typical of a new(ish) shooter getting a bit excited or is there something else going on? I leave the gun to cool for 8 minutes between each shot and as far as I can tell there is no other variables. I look forward to your replies and keeping you up to date with the upcoming rut and roar in Western Victoria, Australia. Thanks Greg |
@ 05:34 am (GMT) |
Michael RaynerRe: Different brassDifferent brands of brass have different internal capacities so if you put the same weight charge into different brass you'll get higher pressure in the one with the least capacity. So what you saw was a pressure spike, so you might think on backing off with the brand that spiked |
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@ 06:01 am (GMT) |
Greg WhorlowRe: Different brassThanks Michael, I was planning to stick with the Norma brass for future loads until I can investigate the Remington, the thought of getting more than 2900 f/s seemed too good to be true. I will stick with the original loads through tested brass to make sure all is safe and sound, cheers. |
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