02-13-2019, 12:49 AM
GiGi post makeover after slimming 0.5mm off her bore and becoming a 243 LBC
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Pushing 95gr SMKs at 2720 with a 10 shot SD of 9 off a Chargemaster drop (no double weighing). I would put her recoil right between where she was pushing 6.5 Grendel 120s at 2500 out of her old 18" and a well tuned .223 pushing 77s around 2700 out of an 18".
After working up ladders with Benchmark, I made a bunch with 27.4 gr for further testing. Put 1 shot downrange that had been seated too short to warm up the barrel and then stopped my first 100 yd 5 shot group at 3 so as to not destroy the pretty picture.
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Adjusted scope elevation 0.6 mils to find the zero. I think I found it with the next shot.
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Still can't shoot 5 without choking the 4th
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Made up some more and went back to the range last week. Was very blustery and none of these frankly felt very good. Was too focussed on grip management (which is where I'm convinced my choke shots arise from) and wasn't consistent on bipod loading. That is a 5 shot group on the left.
[ATTACH=CONFIG]13664[/ATTACH]
I'd say she's a do it all carbine! I'm probably near max with Benchmark. I could probably find a little more speed with other powders, but I'll take the accuracy and keep the heat off her throat since barrel life will be on the shorter side. I just seated at a 2.250 COAL and haven't played with length.
[ATTACH=CONFIG]13660[/ATTACH]
Pushing 95gr SMKs at 2720 with a 10 shot SD of 9 off a Chargemaster drop (no double weighing). I would put her recoil right between where she was pushing 6.5 Grendel 120s at 2500 out of her old 18" and a well tuned .223 pushing 77s around 2700 out of an 18".
After working up ladders with Benchmark, I made a bunch with 27.4 gr for further testing. Put 1 shot downrange that had been seated too short to warm up the barrel and then stopped my first 100 yd 5 shot group at 3 so as to not destroy the pretty picture.
[ATTACH=CONFIG]13661[/ATTACH]
Adjusted scope elevation 0.6 mils to find the zero. I think I found it with the next shot.
[ATTACH=CONFIG]13662[/ATTACH]
Still can't shoot 5 without choking the 4th
[ATTACH=CONFIG]13663[/ATTACH]
Made up some more and went back to the range last week. Was very blustery and none of these frankly felt very good. Was too focussed on grip management (which is where I'm convinced my choke shots arise from) and wasn't consistent on bipod loading. That is a 5 shot group on the left.
[ATTACH=CONFIG]13664[/ATTACH]
I'd say she's a do it all carbine! I'm probably near max with Benchmark. I could probably find a little more speed with other powders, but I'll take the accuracy and keep the heat off her throat since barrel life will be on the shorter side. I just seated at a 2.250 COAL and haven't played with length.
Let's go Brandon!