Acceptable variance for loading?

[captnviper]

New to reloading and currently measure almost every load. I am using a lee adjustable disk with a powder thru die. Was loading .45 auto to 6.7 grns of longshot after using a rcbs 5-0-5 to setup I use a cheap franklin to verify each round. I was getting between 6.6-7 grains, 7 more often than 6.6. So I made small adjustment and it worked well, for 5-10 rounds then 6.2-6.5 adjust again. Got it pretty dialed in but just curios if guys have a window they expect from their equipment and if yes how big is reasonable or acceptable?

[JJ]

Powder type makes a huge difference in metering. If I am using a fine ball powder, 0.3 total variance is generally acceptable (=/- 0.1g)

If you are using an extruded type powder, much more variance may be present. With some of my extruded powder loads i see variance of about 0.5g (+/- 0.2) and would consider it acceptable. If I am at a near max load in this scenario, I will usually throw my charges light, and trickle up to my correct charge.

[Seismic Sam]

Depends on your load. If it's midway between max and min, I'd weigh one or two charges just to check. Forget weighing every charge, and if the Franklin is electronic then it may be worse that not weighing it at all. For max loads you weight every charge to 0.1 with a GOOD beam scale.

[captnviper]

Depends on your load. If it's midway between max and min, I'd weigh one or two charges just to check. Forget weighing every charge, and if the Franklin is electronic then it may be worse that not weighing it at all. For max loads you weight every charge to 0.1 with a GOOD beam scale.

Okay I was under the impression the rcbs is a good beam scale, is this not the case? As far as I can tell when comparing to the beam scale the franklin is .1 of a grain under at this weight and is consistent. If the charge didnt fall between 6.6-6.9 on franklin I would double check(why do I hear that in a chigago accent) it on rcbs.

[Sammichman]

I use an RCBS electronic scale,,when I started using it I would check it against my Beam scale just to Daable check the calibration ,,I don,t bother any more,,(I,m Fluent in Chicago)

[farmerj]

Keep fiddling with the controls or your constant adjusting will statistically make things even worse.

Manufacturing processes have a natural variance to them. In reloading that involves everything you do. The way you pull the handle, return the handle etc.

Manage those variances before you just start tweaking knobs and controls. They both can cause inaccuracies, understanding them is the art.

[BigDog58]

New to reloading and currently measure almost every load. I am using a lee adjustable disk with a powder thru die. Was loading .45 auto to 6.7 grns of longshot after using a rcbs 5-0-5 to setup I use a cheap franklin to verify each round. I was getting between 6.6-7 grains, 7 more often than 6.6. So I made small adjustment and it worked well, for 5-10 rounds then 6.2-6.5 adjust again. Got it pretty dialed in but just curios if guys have a window they expect from their equipment and if yes how big is reasonable or acceptable?

If you are near Edina, you are welcome to stop by and see how I run my Lee Pro Auto Disk. I use Bullseye powder quite a bit for things like 9mm, 38 Spl, 45 ACP and others. I really like it in combination with my Lee Pro Auto Disk. If I set my drop at 4.4 gr I'll get 9 out of 10 drops dead on 4.4 and one at 4.5 . I use a Pact Digital scale and it is right on the money weight wise. I also NEVER turn it off. With electronic scales, it is best to let them run at least 24hrs continuously to let all the components heat up to a stable temp, which prevents fluctuations. I also have mine where no airflow can affect it.

[Jack's My dog]

Keep fiddling with the controls or your constant adjusting will statistically make things even worse.

Manufacturing processes have a natural variance to them. In reloading that involves everything you do. The way you pull the handle, return the handle etc.

Manage those variances before you just start tweaking knobs and controls. They both can cause inaccuracies, understanding them is the art.

I am relatively new to the reloading scene and it blew my mind how much of a weight difference the way I was actuating the charger could make.

[solidgun]

For me, handgun loads +/- 0.2gr
rifle loads +/-0.05gr

I know it can be wider, but my reason for reloading is precision for rifle and power factor for handgun.