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Post by dennis on Nov 26, 2023 8:27:02 GMT -5
Slower rise to peak pressure not speed.
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Post by buckeye68 on Nov 26, 2023 8:30:59 GMT -5
I don’t have any idea but from my understanding benchmark would be a slower burning powder and probably not best suited for a break action with a light bullet. I think there are plenty of established loads for the conversions that I wouldn’t try to reinvent the wheel. I have a conversion also and have gotten great groups with established loads of 4198, h322, N110, and 4227. I don’t think you need to look beyond those. I use 4198 and a Duplex of N110/4198 with good results. Benchmark has been known and tested to be extremely temp insensitive so this is what peaked my curiosity as I have a lot for my 6.5 Grendel and .338 Federal. What I find interesting is that you and a couple other people have said Benchmark is a slower powder. However, in the two other calibers I mentioned above they are only used in light for caliber bullets as it is a faster powder. Where the question comes in is that 4198 is also used in those calibers as well but with heavier bullets than that with Benchmark. This is why I thought it might work and give me a more temp stable load without Duplexing. My ML season can go from 80 to single digits and back in a snap of the fingers. Sometimes in life when you just have to try it for yourself. Seeing is believing. You can read what other people have experienced and still wonder why? Start low and work your way up and find out for yourself. Every gun is different, maybe you’ll find what you’re looking for but something tells me……………………… |
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miked
Junior Member
Posts: 88
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Post by miked on Nov 26, 2023 8:47:34 GMT -5
I use 4198 and a Duplex of N110/4198 with good results. Benchmark has been known and tested to be extremely temp insensitive so this is what peaked my curiosity as I have a lot for my 6.5 Grendel and .338 Federal. What I find interesting is that you and a couple other people have said Benchmark is a slower powder. However, in the two other calibers I mentioned above they are only used in light for caliber bullets as it is a faster powder. Where the question comes in is that 4198 is also used in those calibers as well but with heavier bullets than that with Benchmark. This is why I thought it might work and give me a more temp stable load without Duplexing. My ML season can go from 80 to single digits and back in a snap of the fingers. Sometimes in life when you just have to try it for yourself. Seeing is believing. You can read what other people have experienced and still wonder why? Start low and work your way up and find out for yourself. Every gun is different, maybe you’ll find what you’re looking for but something tells me……………………… Yup I just like to make sense of things is all but not if safety is at risk. I had someone on the Hanks Facebook group say 81 grains with my lighter bullets would be 42kpsi according to quickloads but at only 91/92% efficiency. No one thinks it will work good enough so I probably won't bother. |
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Post by buckeye68 on Nov 26, 2023 10:19:05 GMT -5
Sometimes in life when you just have to try it for yourself. Seeing is believing. You can read what other people have experienced and still wonder why? Start low and work your way up and find out for yourself. Every gun is different, maybe you’ll find what you’re looking for but something tells me……………………… Yup I just like to make sense of things is all but not if safety is at risk. I had someone on the Hanks Facebook group say 81 grains with my lighter bullets would be 42kpsi according to quickloads but at only 91/92% efficiency. No one thinks it will work good enough so I probably won't bother. It all comes down to the grain weight of your bullet, how well your powder chamber and barrel length burns the powder. If you can get all 3 to play well together than you’ve got a great load. If not you will have issues with accuracy or reloading. I had a 40 cal that shot a 250 grain with H4895 unbelievably well. Another guy tried the same load in his gun and it shot like crap. It all comes down to your setup. Overtime guys have figured out that heavy bullets likes slower powder and lighter bullets likes faster powder. What works in one guys gun may not your in yours. |
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Post by jeffgra on Nov 26, 2023 11:35:41 GMT -5
Is anyone using a 290tez with benchmark? I have been using 300gr lead core bullets with it, but at those speeds I’m getting a lot of shrapnel if I hit bone on entry.
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Post by Deputy819 on Nov 26, 2023 13:02:03 GMT -5
 For Reference… |
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Post by Deputy819 on Nov 27, 2023 17:29:41 GMT -5
With a jump of 37 FPS on your last shot, I would say you’ve got another node you can find if you look for it. There’s a node at 89 “ish” grains and another one at 92 “ish” grains…   This is using Pittman 300gr Accumax out of a 26” fluted Brux 1-18” twist (1.25” for 5” shank) using H.I.S ignition, standard modules and Federal GM215M primers. |
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Post by rlp10ml on Nov 28, 2023 9:42:10 GMT -5
Deputy819.... In the burn rate chart you posted I notice a discrepancy between lines #77 & #82, both lines say VV N130. Line #77 should be VV N120, not N130. I realize that you just copy & pasted this but wanted people to be aware of this.
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Post by Deputy819 on Nov 28, 2023 17:14:25 GMT -5
Deputy819.... In the burn rate chart you posted I notice a discrepancy between lines #77 & #82, both lines say VV N130. Line #77 should be VV N120, not N130. I realize that you just copy & pasted this but wanted people to be aware of this. Yep…there’s a few of “those” floating around on the net, but that post was for Benchmark references. 😉 |
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