Moved this from the other thread.
Making 270AR brass from 6.5x47-
The Olympic Arms UMAR lower receiver will allow loading this to 2.4" making it a perfect fit for the 270AR. It really allows loading the bullets out near the lands to gain accuracy.
NOTICE---These are near max loads for the reason above. Be careful when using formed 308 brass start with a load at least 3 gr lower and workup. Accuracy will most likely be found 1/2gr -1gr below the max loads.
EDITED 12/14/14-
Quick testing in the shop today 59degrees-
Lapua brass, CCI450 primers, 20" production barrel, All bullets loaded to 2.300
120SST
37gr H335=2939fps@58kpsi
38gr CFE=2794@50Kpsi- max case fill
130 Berger #27501
36gr H335=2787@57kpsi
38grCFE=2723@51kpsi-max case fill
34gr N530=2820fps@58kpsi
35gr 8208=2750fps@55kpsi
Any loads approaching 57-58k should be considered maximum usable load.
************************************************** ******************************************
2013 data-
85 and 90gr bullets---RE7 36gr produced 3290fps
7/31/13- all loaded to OAL 2.29" 45gr gross case capacity(Creedmoor brass), 18" barrel.
36gr 8208- Hornady 120gr SST produced 2820fps.
37gr IMR 8208- 100gr nosler accubond=2994fps
36gr Alliant 1200R - 105 GS SP solid copper=2996fps
37gr Alliant Re7- 85gr TSX=3450fps
10/18/13-Using Creedmoor brass CCI BR4 primers, 20" barrel. The lands in this chamber are a little closer (.025) than the 6.8s so the same COAL can be used. IMO there is plenty of velocity here with the 130gr bullets.
130gr Berger-36gr 8208=2796fps
120gr SSt-37gr 8208=2887
110gr HPBT-38gr 8208=2998-
12/8/13-20" barrel
110gr Hornady HPBT-near max loads
35gr 10X=2992--10X started cratering primers before N530 or 8208 IMO 10x should be used on bullets 85-110gr
35gr N530=3002
35gr H4895=2748
85gr TSX-near max loads
38gr AA2200=3375
38gr 1200R=3448
99gr GS Custom HV
37gr 1200R=3180
12/15/13
Using Hornady Creedmoor brass. DO NOT USE THESE LOADS IN ANY OTHER BRAND BRASS CASES!!
34gr of 1200R behind the 130 is max IMO...2789fps.
37gr H335, 130 berger=2850
37.5gr H335, 130 berger=2889--close to max, no cratering, primer starting to flatten out a little.
38gr H335, 120gr SST=2977
35gr 1200R, 120 SST=2952
38gr H335, 110gr HPBT=3045
35gr 1200R,110gr HPBT=3023
Making 270AR brass from 6.5x47-
The Olympic Arms UMAR lower receiver will allow loading this to 2.4" making it a perfect fit for the 270AR. It really allows loading the bullets out near the lands to gain accuracy.
NOTICE---These are near max loads for the reason above. Be careful when using formed 308 brass start with a load at least 3 gr lower and workup. Accuracy will most likely be found 1/2gr -1gr below the max loads.
EDITED 12/14/14-
Quick testing in the shop today 59degrees-
Lapua brass, CCI450 primers, 20" production barrel, All bullets loaded to 2.300
120SST
37gr H335=2939fps@58kpsi
38gr CFE=2794@50Kpsi- max case fill
130 Berger #27501
36gr H335=2787@57kpsi
38grCFE=2723@51kpsi-max case fill
34gr N530=2820fps@58kpsi
35gr 8208=2750fps@55kpsi
Any loads approaching 57-58k should be considered maximum usable load.
************************************************** ******************************************
2013 data-
85 and 90gr bullets---RE7 36gr produced 3290fps
7/31/13- all loaded to OAL 2.29" 45gr gross case capacity(Creedmoor brass), 18" barrel.
36gr 8208- Hornady 120gr SST produced 2820fps.
37gr IMR 8208- 100gr nosler accubond=2994fps
36gr Alliant 1200R - 105 GS SP solid copper=2996fps
37gr Alliant Re7- 85gr TSX=3450fps
10/18/13-Using Creedmoor brass CCI BR4 primers, 20" barrel. The lands in this chamber are a little closer (.025) than the 6.8s so the same COAL can be used. IMO there is plenty of velocity here with the 130gr bullets.
130gr Berger-36gr 8208=2796fps
120gr SSt-37gr 8208=2887
110gr HPBT-38gr 8208=2998-
12/8/13-20" barrel
110gr Hornady HPBT-near max loads
35gr 10X=2992--10X started cratering primers before N530 or 8208 IMO 10x should be used on bullets 85-110gr
35gr N530=3002
35gr H4895=2748
85gr TSX-near max loads
38gr AA2200=3375
38gr 1200R=3448
99gr GS Custom HV
37gr 1200R=3180
12/15/13
Using Hornady Creedmoor brass. DO NOT USE THESE LOADS IN ANY OTHER BRAND BRASS CASES!!
34gr of 1200R behind the 130 is max IMO...2789fps.
37gr H335, 130 berger=2850
37.5gr H335, 130 berger=2889--close to max, no cratering, primer starting to flatten out a little.
38gr H335, 120gr SST=2977
35gr 1200R, 120 SST=2952
38gr H335, 110gr HPBT=3045
35gr 1200R,110gr HPBT=3023