Hi,
I have recently acquired my first 6.5 Grendel and I've been loving it so far. The goal was to have a lightweight semi-auto für hunting with a cartridge more potent than .223 but handier than .308 or 6.5CM. The gun uses a 18" Faxon heavy fluted match barrel, aero parts for the upper and a KE Arms KP15 for the lower with a nice trigger as well. I'm always running a suppressor and have an adjustable gas block tuned for that. The gun runs well, never had issues with cycling, ejection, etc. I don't think it's overgassed, it ejects at 4-5 o'clock and reliably locks back after the last round. The gun is shooting 1 MOA with 123grs ELD-M and about 1,5 MOA with PPU or S&B. So far so good.
The thing that irks me though is that the gun is denting the brass cases when chambering a round after a shot. Not every time and seemingly mainly ELD-M though I haven't shot many rounds from other manufacturers. No dents occur when chambering "manually" using the charging handle. Is Hornady using especially soft brass?
I use Amend2 10 round mags. I'm in Germany and we're not allowed to have bigger mags. I've haven't tried a different mag yet but will next time I go to the range.
My theory is that the dent occurs when the cartridge is dragged across the feed ramps and especially the elevated spot in the middle between the two feed ramps. The dent in the brass fits perfectly in there, a main indentation in the middle with lighter scratching to the sides where in contacts the outer edges of the feed ramps. Accuracy hasn't been an issue when firing dented cases but it's still annoying and also a problem if I want to reload cases.
Do you agree with my theory? Do you have any ideas what can be done about it? I'd appreciate your input. I'll add some pics to hopefully make things clear.
I have recently acquired my first 6.5 Grendel and I've been loving it so far. The goal was to have a lightweight semi-auto für hunting with a cartridge more potent than .223 but handier than .308 or 6.5CM. The gun uses a 18" Faxon heavy fluted match barrel, aero parts for the upper and a KE Arms KP15 for the lower with a nice trigger as well. I'm always running a suppressor and have an adjustable gas block tuned for that. The gun runs well, never had issues with cycling, ejection, etc. I don't think it's overgassed, it ejects at 4-5 o'clock and reliably locks back after the last round. The gun is shooting 1 MOA with 123grs ELD-M and about 1,5 MOA with PPU or S&B. So far so good.
The thing that irks me though is that the gun is denting the brass cases when chambering a round after a shot. Not every time and seemingly mainly ELD-M though I haven't shot many rounds from other manufacturers. No dents occur when chambering "manually" using the charging handle. Is Hornady using especially soft brass?
I use Amend2 10 round mags. I'm in Germany and we're not allowed to have bigger mags. I've haven't tried a different mag yet but will next time I go to the range.
My theory is that the dent occurs when the cartridge is dragged across the feed ramps and especially the elevated spot in the middle between the two feed ramps. The dent in the brass fits perfectly in there, a main indentation in the middle with lighter scratching to the sides where in contacts the outer edges of the feed ramps. Accuracy hasn't been an issue when firing dented cases but it's still annoying and also a problem if I want to reload cases.
Do you agree with my theory? Do you have any ideas what can be done about it? I'd appreciate your input. I'll add some pics to hopefully make things clear.
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