scooter123
Member
Consider this as just a reference point, NOT the most accurate possible combination for your rifle. Because every rifle is different in what works the Best. However, it's been my experience that loads with proven accuracy on many rifles can provide a useful point of reference for working up your own load.
Rifle, it's a home brew AR15 built specifically as a Match/Varmint rifle. Barrel is a 20 inch 1:8 Shilen Match with a matching bolt and when I'm shooting well I can get 3 shot cloverleafs at 50 yards with center to center spans under 1/4 inch.
Range, 50 yard indoor range near the house. It's really convenient to work loads up at a range that allows you to reel in your target to study it or change over. In addition I'm getting old enough to not relish all the walking a longer outdoor range would entail. One downside to the 50 yard indoor range is the benches are short, so all shooting is done with the hand guard on a sandbag and the butt of the rifle at the shoulder. Later this spring/summer I'll be hitting the local outdoor club that features nice long shooting benches and ranges out to 300 yards. I expect that will reduce my Flyers and I'll get a better grasp of just how accurate my home brew rifle can shoot. May even borrow a Rifle Rest from a co-worker to get the sole cause of variation down to the trigger release.
Bullets.
Currently the Nosler 60 grain Ballistic Tip and the Hornady 68 grain BTHP Match bullet. Having checked the Nosler on a scale it's weight ranges between 59.9 and 60.0 grains in a 20 piece test lot with NO flyers outside of that range. Accuracy with this particular bullet was excellent at any powder charge within the load parameters provided by Nosler. My conclusion is that this bullet is NOT the least bit velocity sensitive.
With the Hornady bullet the weight story is a mixed bag. Bullets in a re-packaged 500 count box from Midway ranged between 67.6 and 68.2 grains. Bullets from 100 count boxes packaged by Hornady all measured in at 68.0 grains for 20 bullets weighed with NO variation from that weight. Tip here is to purchase the 100 count boxes because the bulk bullets are probably "seconds". Even with that weight variation I can state with certainty that even with the weight variation the Bulk bullets shot with excellent accuracy when not driven too hard. However, I have discovered that this particular bullet should [NOT be driven too hard, push it too fast and your groups will look like you were using a shotgun with 00 buck. Take note of that, because I am not kidding. Groups in the 2650 fps range will run under 1/2 MOA and if you exceed 2800 fps you may see group size grow to 10 MOA or more. Why this
Powders. Varget and CFE223.
Positives for Varget is that it's a highly regarded rifle powder capable of excellent accuracy. In addition my experience is that Varget is rather clean shooting at starting load levels and has proven accurate when loaded somewhat "mildly". The downside is that it's an extruded stick powder and meters poorly. So either plan on hand weighing each charge or put your charge weight smack in the middle between Min and Max and expect the degradation in accuracy a +/- 0.8 grain charge variation can produce. Yeah, it really can vary that much from an RCBS Competition Measure and that is why I have tweezers next to my scale for loading with Varget.
Positives for the CFE223 is superb metering and I have found that my barrel is much easier to get totally copper free after shooting loads using this powder. So, that Copper Fouling Eliminator actually is more than basic Marketing Hype. The downside is that it does get rather dirty at low operating pressures and the residue seems to be a bit oily in feel. As a result your bolt carrier will look likes it's been sitting in a Diesel Exhaust when working loads up from the minimum. Good news is that near maximum charge levels it cleans up quite nicely.
Best accuracy loads using Varget. Oddly enough both bullets use a powder weight of 23.7 grains. The Hornady bullet does really well with this powder and charge weight and 50 yard 3 shot cloverleafs spanning 0.23 inch are typical when I do it right. The Nosler bullet is a bit less accurate with 3 shot groups averaging 3/8 inch and the group center drifts down and to the right by about 7/16 inch.
Best accuracy with CFE223. With this powder I a common powder weight didn't work well. What I found was that the Nosler bullet liked to be run near the maximum charge weight. The most accurate load was one featuring a 26.7 grain charge weight and groups size averaged 0.26 inch for 3 shot groups. With the Hornady bullet the most accurate load was near the minimum starting charge at 23.9 grains and group sizes were 0.17, 0.18, and 0.28. Basically with the first two groups fired I could completely cover the hole produced by 3 shots with a 40 caliber bullet. As for the third group, I believe I jerked the trigger and pulled the shot to the right.
Note, a charge weight of 24.2 grains produced results quite close to the lighter charge and at 24.5 grains the accuracy started to fall off noticeably. I'll also note that the most accurate load for the Hornady bullet has a predicted velocity nearly identical to the most accurate load featuring Varget. Why the Hornady bullet is so speed sensitive in my rifle I really don't understand, perhaps it's a balance issue in the bullet. Down the road I intend to get some Sierra and Berger bullets in this weight range to see if they behave in a similar manner.
Rifle, it's a home brew AR15 built specifically as a Match/Varmint rifle. Barrel is a 20 inch 1:8 Shilen Match with a matching bolt and when I'm shooting well I can get 3 shot cloverleafs at 50 yards with center to center spans under 1/4 inch.
Range, 50 yard indoor range near the house. It's really convenient to work loads up at a range that allows you to reel in your target to study it or change over. In addition I'm getting old enough to not relish all the walking a longer outdoor range would entail. One downside to the 50 yard indoor range is the benches are short, so all shooting is done with the hand guard on a sandbag and the butt of the rifle at the shoulder. Later this spring/summer I'll be hitting the local outdoor club that features nice long shooting benches and ranges out to 300 yards. I expect that will reduce my Flyers and I'll get a better grasp of just how accurate my home brew rifle can shoot. May even borrow a Rifle Rest from a co-worker to get the sole cause of variation down to the trigger release.
Bullets.
Currently the Nosler 60 grain Ballistic Tip and the Hornady 68 grain BTHP Match bullet. Having checked the Nosler on a scale it's weight ranges between 59.9 and 60.0 grains in a 20 piece test lot with NO flyers outside of that range. Accuracy with this particular bullet was excellent at any powder charge within the load parameters provided by Nosler. My conclusion is that this bullet is NOT the least bit velocity sensitive.
With the Hornady bullet the weight story is a mixed bag. Bullets in a re-packaged 500 count box from Midway ranged between 67.6 and 68.2 grains. Bullets from 100 count boxes packaged by Hornady all measured in at 68.0 grains for 20 bullets weighed with NO variation from that weight. Tip here is to purchase the 100 count boxes because the bulk bullets are probably "seconds". Even with that weight variation I can state with certainty that even with the weight variation the Bulk bullets shot with excellent accuracy when not driven too hard. However, I have discovered that this particular bullet should [NOT be driven too hard, push it too fast and your groups will look like you were using a shotgun with 00 buck. Take note of that, because I am not kidding. Groups in the 2650 fps range will run under 1/2 MOA and if you exceed 2800 fps you may see group size grow to 10 MOA or more. Why this
Powders. Varget and CFE223.
Positives for Varget is that it's a highly regarded rifle powder capable of excellent accuracy. In addition my experience is that Varget is rather clean shooting at starting load levels and has proven accurate when loaded somewhat "mildly". The downside is that it's an extruded stick powder and meters poorly. So either plan on hand weighing each charge or put your charge weight smack in the middle between Min and Max and expect the degradation in accuracy a +/- 0.8 grain charge variation can produce. Yeah, it really can vary that much from an RCBS Competition Measure and that is why I have tweezers next to my scale for loading with Varget.
Positives for the CFE223 is superb metering and I have found that my barrel is much easier to get totally copper free after shooting loads using this powder. So, that Copper Fouling Eliminator actually is more than basic Marketing Hype. The downside is that it does get rather dirty at low operating pressures and the residue seems to be a bit oily in feel. As a result your bolt carrier will look likes it's been sitting in a Diesel Exhaust when working loads up from the minimum. Good news is that near maximum charge levels it cleans up quite nicely.
Best accuracy loads using Varget. Oddly enough both bullets use a powder weight of 23.7 grains. The Hornady bullet does really well with this powder and charge weight and 50 yard 3 shot cloverleafs spanning 0.23 inch are typical when I do it right. The Nosler bullet is a bit less accurate with 3 shot groups averaging 3/8 inch and the group center drifts down and to the right by about 7/16 inch.
Best accuracy with CFE223. With this powder I a common powder weight didn't work well. What I found was that the Nosler bullet liked to be run near the maximum charge weight. The most accurate load was one featuring a 26.7 grain charge weight and groups size averaged 0.26 inch for 3 shot groups. With the Hornady bullet the most accurate load was near the minimum starting charge at 23.9 grains and group sizes were 0.17, 0.18, and 0.28. Basically with the first two groups fired I could completely cover the hole produced by 3 shots with a 40 caliber bullet. As for the third group, I believe I jerked the trigger and pulled the shot to the right.
Note, a charge weight of 24.2 grains produced results quite close to the lighter charge and at 24.5 grains the accuracy started to fall off noticeably. I'll also note that the most accurate load for the Hornady bullet has a predicted velocity nearly identical to the most accurate load featuring Varget. Why the Hornady bullet is so speed sensitive in my rifle I really don't understand, perhaps it's a balance issue in the bullet. Down the road I intend to get some Sierra and Berger bullets in this weight range to see if they behave in a similar manner.