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Post by cgbills on Jul 14, 2017 18:04:48 GMT -8
I just got my BHW 20in 243LBC upper put together and was going to start load development. I was just going to try out 95gr Berger VLD's due to the barrel being chambered for them, but I decided to try out some 95 Sierra Tipped Match Kings (TMK) due to their .500 BC. Has anyone had experience with the Sierra TMK's?.
To the Ladder test questions. (I will be using 8208 powder, Lapua brass and CCI BR-4 primers) My first question is does anyone have a good starting powder charge for my ladder test? Next what increments should I go up each time, .2grs? I have only reloaded for 7wsm and 6.5 creedmoor, and didn't know how small the increments should be for this smaller case and 8208 powder. Finally, what should be considered near MAX load? I know every setup is different, but I like to know where that upper limit is roughly at. When I ran my 264 LBC I would just throw 28 grains and call it a day, but with this 243 LBC I want to eek more velocity.
Thanks for the help
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Post by Deleted on Jul 15, 2017 3:59:09 GMT -8
I just got my BHW 20in 243LBC upper put together and was going to start load development. I was just going to try out 95gr Berger VLD's due to the barrel being chambered for them, but I decided to try out some 95 Sierra Tipped Match Kings (TMK) due to their .500 BC. Has anyone had experience with the Sierra TMK's?. To the Ladder test questions. (I will be using 8208 powder, Lapua brass and CCI BR-4 primers) My first question is does anyone have a good starting powder charge for my ladder test? Next what increments should I go up each time, .2grs? I have only reloaded for 7wsm and 6.5 creedmoor, and didn't know how small the increments should be for this smaller case and 8208 powder. Finally, what should be considered near MAX load? I know every setup is different, but I like to know where that upper limit is roughly at. When I ran my 264 LBC I would just throw 28 grains and call it a day, but with this 243 LBC I want to eek more velocity. Thanks for the help I start at 28 grains. I work up in .2 grain increments. You should find your best accuracy around 28.6. That seems to be the sweet spot for most of the barrels I have worked with. You will also want to work with seating depth. I try to get as close to the rifling as possible.
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Post by GLSHOOTER on Jul 15, 2017 15:45:49 GMT -8
Scratch that lol. Shot that load today in 109* weather and it started getting a pressure ring on the brass. That 109 is a decent cool summer day here.I'd bring it down to about 29.0 at the very top and call it good. The bolts out there may or may not take the extra extra but I don't like breaking equipment. I'd rather have a YOUNG bolt as a belt and suspenders with some room then some of the other ones out there and be wearing a G-Sting hoping the floss doesn't beak. . I know of one brand that is sold a great deal and those loads would eat them up like M&M's at a five year old's birthday party. I've shot them far hotter than that with 8208 but that was a first time range trip and some pockets were not as tight as I'd have liked on that high dollar brass. I'm up to eight loadings with a 95 and 28.6 of 8208 and I think I'm good. Greg
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Post by warriorscholar on Oct 6, 2017 17:56:28 GMT -8
I tried 95TMK with CFE223 for the 1st time a few weeks ago. My results were 2942fps ES 7.86 SD 3.60 with CFE223 32.3g from a 22in barrel. 4 shot Group was just over 3/4 MOA with 3 making a oval. 2.303OAL 1.702 CBTO. This load has shot well the last 2 outings working a 4" gong at 300 yards.
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Post by l3outdoorsstx on Oct 9, 2017 13:18:24 GMT -8
IMO be very careful with 8208 in this cartridge. I feel this powder is much faster than it used to be. If you look at Hodgdons data for 6mmBR and 90gr Bullets they show a MAX now of 28.0gr of 8208. This has changed from previous years. So if you're loading 28.6 keep in mind your .6 over 6mmBR MAX.
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Post by Deleted on Oct 9, 2017 15:27:03 GMT -8
IMO be very careful with 8208 in this cartridge. I feel this powder is much faster than it used to be. If you look at Hodgdons data for 6mmBR and 90gr Bullets they show a MAX now of 28.0gr of 8208. This has changed from previous years. So if you're loading 28.6 keep in mind your .6 over 6mmBR MAX. I don't know that anything has changed. The data on Hogdon's is in CUP. This is an outdated method at best. I pressure tested the 243 LBC using strain gauges and a Black Hole Weaponry P3 test barrel. The data we accumulated was then cross referenced with Quick Load. We used this as a safety measure only, but found it interesting that the data I got from the test barrel was within 500 PSI of the Quick Load data. I can also say with absolute certainty that if I felt the loads I tested were unsafe I wouldn't recommend them to any one. I have never broken a bolt or pierced a primer or even got primer extrusion using these loads. If you feel IMR 8208 has changed, go to H4895 you could also try CFE223. There's more than one way to skin this cat.
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Post by GLSHOOTER on Oct 9, 2017 16:32:03 GMT -8
The pressure from the 6BR is in CUP. The LBC is up in the 55,00 0 range. In the 95 it is loaded longer than the BR and this lowers the pressure. We've been shooting 28.6 in the LBC/95 for several years. Our pressure testing has shown it to be in the safe range for us. Velocities are not excessive and the pockets are still tight after many loadings.
It's a wildcat so you as the shooter/loader must make your own decisions. The 8208 I use today gives me the same numbers from years ago. I have seen no shift in that area over any of the myriad of cartridges I use it in.
Greg
Posted be before I saw Ritch's above. (VBG)
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Post by l3outdoorsstx on Oct 9, 2017 18:08:02 GMT -8
I would still proceed with caution and use 28.6 as a absolute max.
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Post by GLSHOOTER on Oct 9, 2017 18:10:21 GMT -8
I would still proceed with caution and use 28.6 as a absolute max. [/quote That's pretty much what we said. In fact that's what we say regardless of the load. Greg
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