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Old 06-26-2012, 20:37   #10
Counting Beans
Join Date: Dec 2008
Location: Boise, Idaho
Posts: 3,244
Originally Posted by DarkShooter View Post
Im finally gonna work up some full power 10mm handloads for my stock Gen3 20. Ive previously only done FBI loads and 40's for my KKM Precision barrel.
Id like to get 1300fps with 180gr Gold Dots and XTP, and 1200fps with 200gr XTP and FMJ. These are max or near max loads from Speer #12 and Hornady #4 manuals.
Would I be ok with the stock barrel / recoil spring assembly, or should I get an aftermarket barrel/rsa right from the start? Im concerned about the brass smiles and havin a strong enough spring to prevent battering.
Im asking because these are max loads from the manuals, but milder than some loads ive seen suggested. Thx for the help.

As with any barrel or platform setup, you can't know what is safe without doing careful load workups. I reduce the charge weights and work up in 0.2 - 0.3 grain increments. I load at least 5, and usually 10 at each charge weight to check for groups, function, and indications of excessive pressure. I also look for deviations on velocity, but that is down the list of concerns for pistol rounds. My practice is to shoot one round, collect the brass, inspect. Repeat.

As Murphy would have it, the one time I did not follow my normal loading and inspection process, I overlooked smiles. I got a bit lax. My powder increments were also bigger (0.5 grains). The next string the smiles were huge and primers were FLAT. I had shot a couple like that before noticing. I have never repeated that mistake. This was a load way below book max. It was with 800-X and 180 XTPs. All hand weighed and verified with check weights.

Bottom line, there is really no way to know what is safe without doing the workups - but that is true with an aftermarket barrel too. Things run differently in different setups. If you see smiles, you've gone too far.

1200 fps is attainable in my stock G20 with a 200 gr XTP over 13.0 grains of Accurate no. 9 (WLP primer) by following Hornady book data. That charge weight is between the maxes of Accurate Powders (12.5) and Hornady(13.2) published data.
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