I am using ar comp and 8208xbr, I need the start and Max charges for these powders with a 107 gr matchking
need 107gr sierra load info
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There is data from Hodgdon's for 107gr SMK with 8208XBR. There are sticky's in this Reloading Sub Forum. It's also in the 6.5 Grendel Reloading Handbook Volume I for your convenience for your bench.
8208XBR w/ 107gr SMK
COL: 2.250"
Start load: 27.0gr
Max load: 29.8gr Compressed
Work up a pressure ladder if you have a chronograph or velocity instrumentation, using no more than .3gr increments.
For AR-Comp, I would use the same start load, but I don't have data for max on it with the 107gr SMK. There is a bit of data for it with 120gr NBT and 123gr A-MAX, as well as 123gr SST. Max loads for 123gr are at 28.0gr. I'm thinking that 28.5gr to 29.0gr will be the max, but those are just educated guesses.
Drifter has worked with AR-Comp a bunch, as has Hoot. I'm not sure if either of them have loaded it under the 107gr SMK though.
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I use 30.2 grains of 8208 XBR and set the shoulder .02" back from the lands. My throat is about .06" longer than a spec throat so approach this load slowly. Velocity is in the low 2700 range. Accuracy is routinely .75" and sometimes about .5". You can use LVR too for good accuracy. Top load for me is 32.8. I don't have velocity values for that load but it is in the mid 2700 range.
22" Lothar Walthar barrel.
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