I'm buying a 357sig barrel for my g23 that I will reload for. I've reloaded for 400corbon so I do know a little about bottle necked cartridges. Are there any differences between the stock and after market barrels as far as chambers(head space?)?I'm looking at LWDs 4.49" xl and stormlake's stock length right now but might spend the extra few dollars on a glock barrel. Any insight would be welcomed.