Been preparing for an exotic sheep hunt to field test the 257 and 270 Allen Mags. The hunt has been bumped back a week or to as we were supposed to be hunting today [img]/ubbthreads/images/graemlins/frown.gif[/img]...
Thats alright through, give me a bit more time to do a little more testing.
Anyway I wanted to test the 270 Allen Mag at some longer ranges so I drew up a drop chart using the muzzle velocity along with the 100 and 450 yard impact data and headed up to the range.
I set up the exact same target as I did for testing the 338 Kahn at 1 mile. A roughly 4x4 foot board wrapped in whote freezer paper with a 9"x11" dark cardboard piece for a center hold point.
Set the target board up and drove to the rims across the canyon to set up for the shot. I wanted to set up at some decent range so I went to where I knew I would be over 1/2 mile.
The rifle is built on a Savage M116 receiver, basically as an experiement to see how it would perform.
The barrel is fitted via a Rem 700 so the Savage Barrel Locking nut system is removed. Makes for a much cleaner looking rifle in my opinion. The stock is a factory Laminate which I repillar bedded and opened the barrel channel to float the #6 contour 30" barrel.
The scope is the great Weaver 4.5-14 Tactical Mil-Dot which is my personal favorite big game scope for hunting out to 1000 yards.
The load was the 169.5 gr ULD RBBT Wildcat loaded to 3300 fps with 100.0 gr WC872. This is a relatively mild load as 3400 fps is easily reachable but there is really no advantage at long range.
This is the view of the target board at 930 yards.
THis test was to see how the drop chart matched up to actual bullet flight as as I am preparing for a sheep hunt I wanted to shoot from a hunting position so I used a Harris bipod and a small rear bag and shot in the prone position.
I set up a ranging rock just to the left of the target board to shoot at before I went for paper.
I ranged teh target with the Leica 1200 and got three readings of 930, 929 and 930. The closest range I had on the drop chart was 920 yards which listed a hold of -4 1/4 mils dots for this range.
As this is a big game rifle I have it set up to use a fixed zero and then use the mil-dots as multipul reference points at different ranges. The rifle is zeroed at 275 yards with the main cross hair and the bottom post was listed a as a dead on hold for 1000 yards.
The wind was very light but there, about 2 mph so I lined the vertical stadia on teh left side of the 10" ranging rock and took the 4 1/4 mil hold and let the first shot fly. The bullet landed on the bottom edge of the rock dead center. I was happy. That would have been a very dead ram.
I loaded a second round and raised my hold just a couple inches on target and at the shot the 10" round sandstone rock crumbled into dust. I was very happy.
I let the rifle cool totally and thenlined her up for a three shot group on paper. To took the same hold that the drop chart listed and fired the first shot. I could see dust boil up from behind the cardboard center, I knew I had a hit very close to center.
Loaded shot number two and settled in. This time the trigger go away from me a bit early but I still say dust fly from behind the rock.
On shot three I concentrated better then shot two and again saw dust roll out from behind the center board.
I loaded up and drove back to the target. I was confident that I had two shots well within a kill zone on a sheep at this range. The second shot may have dropped out.
As I walked up to the target I was very pleased to see shots one and three within 1.5" and on the right center part of the cardboard!! Shot two had dropped out of the group but not nearly by as much as I was expecting.
The total group was just over 5.5" ctc which from an 11 lb rifle ready to hunt, is not all that bad.
The best thing is that all five shots taken would have easily landed on the front shoulders of a mature ram at this range.
The data used for the drop chart was 3300 fps with a B.C. of .740 for the 169.5 gr ULD RBBT .277" Wildcat Bullet.
I thing she is ready to hunt with. Will report on the hunt when we get back.