Hard daily loss limit vs flexible weekly limit for scalpers

[FXS London Scalper]

Two approaches to loss limits:

Hard daily limit:
- Fixed maximum loss per day, e.g. 2%.
- When hit, stop for the day.
- Pros: prevents single bad days from causing major damage. Simple.
- Cons: may stop trading on a day that would have recovered.

Flexible weekly limit:
- Maximum loss per week, e.g. 5%.
- Can lose more on one day if the week allows.
- Pros: more flexibility.
- Cons: a single very bad day can consume most of the weekly budget.

Combination:
- Daily limit 2%, weekly limit 4%.
- Both apply: stop for the day at 2%, stop for the week at 4%.

For prop traders, the firm's daily limit is usually fixed, so a personal weekly limit adds a second layer.

Which do you use? Have you ever regretted hitting the daily limit?

[Shadow Trader]

A skipped limit order feels like a bug. It usually is not, and the reason is simple once the mechanics are clear.

Price touching a level on a chart and an order being filled at that level are two different events. If the market jumps from above a buy limit to well below it in a single tick, nothing ever printed at that level. There was no price to match against, so the order either gets filled at the first available price, which can be better than requested, or it stays pending depending on how the broker handles it. That behavior comes from the execution model and the liquidity feed behind it, and it differs from one broker to the next.

The other cause is spread. A buy limit triggers on the ask, but most charts draw the bid. The chart can appear to touch the level while the ask never got there, and during news the spread widens enough to make that mismatch very common.

So a skipped limit during a spike often means the chart was showing the wrong side of the book, not that the order was ignored.

Has anyone compared how the same limit order behaves on two different brokers during the same release?