I'm looking at getting a Harrells powder thrower and was wondering what one would be better measuring 4227 or is there a better thrower out there ? My load is 13.1 grains are they capable to get it close as possible and load at the bench instead of measuring all my load at home on a scale

Harrells produces one of the most accurate measures made.
Which model do you wish to order?
The Schuetzen/pistol model is even more accurate measuring small loads.

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I have won championships using a Lyman 55 but it is not accurate unless you use light steady control when you operate it and never let the hopper get less than half full.
And NEVER ever use the knocker.

Every powder measure requires you to learn how to best manipulate it.

The Harrell measures allow you to be able to accurately stratify even finer loads than most other powder measures.

Use your Harrel measure gently.

  After buying a Harrell's Schuetzen measure I'll never use anything else. Most accurate and consistent measure I've ever owned.

Having used both the Harrells SCHUETZEN and BENCH REST measures for some years, I find the BR throws more accurate charges than the Schuetzen with 4227. The Schuetzen measure cuts more 4227 powder kernels than the BR. The Schetzen is great for flake and ball powders such as Win 296 & Accurate No.9 but the BR is better for short stick powders such as 4227 IMO. NOW . . . if I were only going to use one measure, I'd take the Schuetzen, hands-down.
More comments; I've used a number of measures over the years. There are a lot of good ones available but the Harrells has given the best results for me. As stated earlier, the Harrells takes a light hand to get the most consistent powder charges.